#getting user input in java by using scanner class

[smartprogramming]

Getting User Input in Java (using Scanner class) by Deepak

[shajithwikiod]

Text Input and Output

For some unfathomable reason, Java has never made it easy to read data typed in by the user of a program. You’ve already seen that output can be displayed to the user using the subroutine System.out.print. This subroutine is part of a pre-defined object called System.out. The purpose of this object is precisely to display output to the user. There is a corresponding object called System.in that exists to read data input by the user, but it provides only very primitive input facilities, and it requires some advanced Java programming skills to use it effectively.

Java 5.0 finally makes input a little easier with a new Scanner class. However, it requires some knowledge of object-oriented programming to use this class, so it’s not appropriate for use here at the beginning of this course. (Furthermore, in my opinion, Scanner still does not get things quite right.)

There is some excuse for this lack of concern with input, since Java is meant mainly to write programs for Graphical User Interfaces, and those programs have their own style of input/output, which is implemented in Java. However, basic support is needed for input/output in old-fashioned non-GUI programs. Fortunately, it is possible to extend Java by creating new classes that provide subroutines that are not available in the standard part of the language. As soon as a new class is available, the subroutines that it contains can be used in exactly the same way as built-in routines.

Along these lines, I’ve written a class called TextIO that defines subroutines for reading values typed by the user of a non-GUI program. The subroutines in this class make it possible to get input from the standard input object, System.in, without knowing about the advanced aspects of Java that are needed to use Scanner or to use System.in directly. TextIO also contains a set of output subroutines. The output subroutines are similar to those provided in System.out, but they provide a few additional features. You can use whichever set of output subroutines you prefer, and you can even mix them in the same program.

To use the TextIO class, you must make sure that the class is available to your program. What this means depends on the Java programming environment that you are using. In general, you just have to add the source code file, TextIO.java, to the same directory that contains your main program. See Section 2.6 for more information about how to use TextIO.

[homeworkdave]

CSE 110 - Lab 3

CSE 110 – Lab 3

CSE 110 – Lab 3 Lab Topics • Using the Scanner Class with input validation • Getting familiar with the basic flow control in Java. • Input validation Problem Description: Final Weighted Total Calculator Your task is to design a program which takes 3 user inputs as homework grade, midterm exam grade, and final exam grade. Then use the following formula to calculate the weighted…

[tutorialcup]

Java Scanner

The Java Scanner class is used to get user input from different streams like user input, file, and the input string. This class is part of the java.util package. By using various in-built methods, it can read different types of input. Working of Scanner The scanner object reads the input and divides it into tokens based on a delimiter which is normally white space. It then iterates through each token which is nothing but each data using its in-built methods. For example, consider the below input string String s = "My age is 22"; In this case, it divides the string into 4 tokens "My", "age", "is", "22" which uses space as a delimiter. Create a Java Scanner object Import Scanner Java To use the Java Scanner class, we import the java.util.Scanner package. The below code shows you how to create a scanner object with different input streams. The 1st object sc reads input data from user input which can be through the keyboard. The 2nd object sc1 reads input from a file and the 3rd object sc2 reads input from a string. //Read from user input Scanner sc = new Scanner(System.in); //Read from file Scanner sc1 = new Scanner(File f); //Read from string Scanner sc3 = new Scanner(String s); Scanner Methods to read different input types We can use the below methods to read different input types and other manipulations Java Scanner Exception Java Scanner class throws the below exceptions while trying to read input: - IllelgalStateException - when we attempt to perform search operation on closed scanner object - NoSuchElementException - when there is no token found - InputMismatchException - when the input does not match with the expected type Scanner nextLine() example using System.in In the below example, we are creating a scanner object to read the Java user input using System.in which is nothing but the keyboard input. nextLine() method reads a single input line until it encounters "n" (end of line). import java.util.Scanner; public class ScannerDemo1 { public static void main(String args) { System.out.println("Enter your name:"); Scanner sc = new Scanner(System.in); String s = sc.nextLine(); System.out.println("Your name is " + s); sc.close(); } } Enter your name: Ravi Kumar Your name is Ravi Kumar Java Scanner nextInt() example using System.in Here, we use the nextInt() to read the integer value input from the user through keyboard input. Hence we pass System.in to the scanner object. import java.util.Scanner; public class ScannerDemo1 { public static void main(String args) { System.out.println("Enter your age:"); Scanner sc = new Scanner(System.in); int i = sc.nextInt(); System.out.println("Your age is " + i); sc.close(); } } Enter your age: 35 Your age is 35 Java Scanner next() example using String input In the below example, we use String as the input source. We pass this to the scanner object. To read individual words, we use the next() method. This method by default uses space as a delimiter. We use hasNext() method in a while loop so that it prints every word until it reaches the last word. import java.util.Scanner; public class ScannerString { public static void main(String args) { String s = "Welcome to Java Programming"; Scanner sc = new Scanner(s); while(sc.hasNext()) { System.out.println(sc.next()); } sc.close(); } } Welcome to Java Programming Read input from a file In this example, we use the file as an input source and pass this as a parameter to the java scanner object. We have created a file with contents having 2 lines. Hence using hasNextLine() in a while loop, we can read individual lines using the nextLine() till it reaches the last line. import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class ScannerFile { public static void main(String args) throws FileNotFoundException { File f = new File(filepath); //Pass the filepath here Scanner sc = new Scanner(f); while(sc.hasNextLine()) { System.out.println(sc.nextLine()); } sc.close(); } } Welcome to Java programming You will learn about Java Scanner class Java Scanner example using a delimiter When we pass a string as an input source to the scanner object, we can specify the delimiter to split the string instead of using the default space. In the below example, we use "-" as a delimiter. import java.util.Scanner; public class ScannerString { public static void main(String args) { //String s = "Welcome to Java Programming"; String s = "This-is-an-example-of-using-delimiter"; Scanner sc = new Scanner(s).useDelimiter("-"); while(sc.hasNext()) { System.out.println(sc.next()); } } } This is an example of using delimiter   Conclusion In this tutorial, we have learned about Java scanner and how to read different input types using its built-in methods along with various examples. Reference Read the full article

[inlarn]

Java program to add two numbers taking input from the user, this is will receive the input from the user and perform addition of two numbers in java.

In this program, you will learn how to write an addition of two numbers in a java program. This software can combine two separate numbers into a single number.

Here’s a java program for beginners in the java program that does addition with the third variable.

https://inlarn.com/java-program-to-add-two-numbers-taking-input-from-user/

What is operator and operands in additon program in java?

The constructions that may alter the values of the operands are known as operators. Consider the formula 2 + 3 = 5, where the operands are 2 and 3 and the operator is +.

In Java, an operator is a specific symbol or keyword that denotes a mathematical operation or another sort of operation that may be performed on one or more operands.

How the addition of two numbers program is working?

In Java, the + operator is used to multiply two integers. Using the Scanner class, get the needed values from the user and use the + operator to combine them.

Sum() is a Java built-in method that returns the total of its inputs. The technique uses the + operator to add two numbers together.

The syntax is as follows: sum public static int (int a, int b) Parameter: Two parameters are accepted by the procedure, which must be combined together: a: the initial digit of the integer value.

nextInt() function in java programming?

nextInt() is a method that returns an integer. As an int scans the next token of the input.

The invocation of this method with the form nextInt() works in the same way as the invocation with the form nextInt().

nextInt(radix), where radix is the scanner’s default radix. A Scanner object’s nextInt() function takes a string of digits and transforms it to an int type.

[sharifs]

Coding A Raffle List Editor in Java Using ArrayList

One night in the summer while looking over my decent game collection which you may have seen in the background of one of my “Video Game Sheriff” series videos, while having trouble deciding which of the many great games I wanted to play in that moment, I was inspired to write a program that could work like a hat where I could put in the titles of all my games then select one out at random.

You can get a glimpse of my collection in the background of some of my videos also posted on this site.

The resultant application is a console based editor which allows the user to build his own list of titles, edit them, delete them individually, clear them all, save them to a text file as well as read the text file made (or imported to the folder) prior to running the program.

I’m going to go through each part of the code and explain why I made the choices I did. I hope this can provide a good reference or template for your java projects.

My main method for accomplishing the editor and raffle program was centered around the use of arraylist along with some basic IO work. Let’s dive right in:

First I imported the libraries I thought I might need (you can figure this out as you go along of course)

import java.util.*; import java.io.*; import java.nio.file.*;

Variables

I decided to write this procedurally as one class since this is not a huge complex program being developed in a massive organization. I called my main class “Interface” but you can choose any name you want for yours. I decided to make a unique scanner object for each part of the program, but this may not be necessary in your project. I have laid out all the variables I used, though you may get by on more or less variables, considering the structure of my app, it will need to use at least one arraylist to function. Note that I use a Random class from the library in order to generate a random seed for the raffle feature.

public class Interface { public static void main(String[] args) throws IOException { Scanner selection = new Scanner(System.in); Scanner input = new Scanner(System.in); Scanner in = new Scanner(System.in); Scanner edit = new Scanner(System.in); int currentChoice = 0; String currentGame = "null"; ArrayList<String> games = new ArrayList<String>(); Random raffleWheel = new Random(); String userEdit = "null"; int gameIndex = 0; int gameIndex4D = 0;

Menu LOOP

The top of my program begins with a welcome message and a menu in a while loop along with an input scanner object awaiting user input based on selecting from the menu (loop closes at end of program shown at end of article). Note that because choices 8 & 9 exit the program, I made that as the loop condition.

System.out.println("Welcome to the Backlog Gaming Sheriff's Super Raffler!\n"); while (currentChoice <= 7 || currentChoice >= 10){ System.out.println("\n1. Run the Raffler and make a random selection."); System.out.println("2. View game list"); System.out.println("3. Add new game to the list"); System.out.println("4. Delete a game from the list"); System.out.println("5. Edit a game on the list"); System.out.println("6. Clear Game List"); System.out.println("7. Read Game List"); System.out.println("8. Quit & Save List"); System.out.println("9. Quit without saving\n"); System.out.println("Please make a selection from the above options"); currentChoice = selection.nextInt();

Conditional Statements

Next up are the conditional statements that serve as the engine of the program. I first start with a potentially erroneous input, beyond the menu choices.

if (currentChoice > 9){ System.out.println("Error. Invalid input. Please try again.\n"); }

My next conditional statement is for choice #7 from the menu to read the game list, as that is often the first thing the user may need to do.

else if (currentChoice == 7){ try (BufferedReader br = new BufferedReader(new FileReader("Game_List.txt"))) { String line; while ((line = br.readLine()) != null) { games.add(line); } } }

The following conditional statement allows the user to delete a title from the list while providing the option to confirm or cancel the deletion of that item (more fail safe than C!) and provides the template for other options requiring submenu options. Note my use of ArrayList class’s ‘size’ function to determine the length of the array to base the validity of the index number on.

else if (currentChoice == 4){ int counter = 1; while (counter != 0){ System.out.println("\nPlease enter game index number"); gameIndex4D = in.nextInt(); if (gameIndex4D > games.size()){ System.out.println("\nError. Invalid index number."); } else if (gameIndex4D < 0){ System.out.println("\nError. Invalid index number."); } else counter = 0; } System.out.println("\nThe selected game title currently is:"); System.out.println(games.get(gameIndex4D)); System.out.println("\nAre you sure you want to delete the selected title?"); System.out.println("1. Confirm"); System.out.println("2. Cancel"); int userChoice = in.nextInt(); if (userChoice == 1){ games.remove(gameIndex4D); System.out.println("Selected title deleted."); } else if (userChoice == 2 || userChoice < 1 || userChoice >2){ System.out.println("Deletion Canceled."); } }

A simpler version of the above condition, allows the user to clear the entire list from the program (but not the file).

else if (currentChoice == 6){ System.out.println("\nAre you sure you want to delete all titles?"); System.out.println("1. Confirm"); System.out.println("2. Cancel"); int userChoice = in.nextInt(); if (userChoice == 1){ while (games.size() > 0){ games.remove(games.size()-1); } System.out.println("Game list cleared."); } else if (userChoice == 2 || userChoice < 1 || userChoice >2){ System.out.println("Deletion Canceled."); } }

To add a title, I simply used ArrayList class’s ‘add’ function.

else if (currentChoice == 3){ System.out.println("\nPlease enter game name"); currentGame = input.nextLine(); games.add(currentGame); }

In order to list out every title in the ArrayList for the user, I wrote a simple for loop to handle that task for each item in the list, printed with print line.

else if (currentChoice == 2){ for (int i=0;i<(games.size());i++){ System.out.println(games.get(i)); } }

The conditional statement after that handles the actual raffle feature, randomly selecting one title from the entire list.

else if (currentChoice == 1){ System.out.println("Running Raffler\n"); for (int i=1;i<4;i++){ System.out.print("."); } int raffleNum = raffleWheel.nextInt(games.size()); String raffleGame = games.get(raffleNum); System.out.println("\n" + raffleGame); }

Once again using the submenu template I wrote for the delete option, this condition was developed to allow the user to change the name of a title he already added based on the index number (with title 1 starting at index 0, title 2 at index 1, etc…).

else if (currentChoice == 5){ int counter2 = 1; while (counter2 != 0){ System.out.println("\nPlease enter game index number"); gameIndex = in.nextInt(); if (gameIndex > games.size()){ System.out.println("\nError. Invalid index number."); } else if (gameIndex < 0){ System.out.println("\nError. Invalid index number."); } else counter2 = 0; } System.out.println("\nThe selected game title currently is:"); System.out.println(games.get(gameIndex)); System.out.println("\nPlease enter replacement title:"); userEdit = edit.nextLine(); games.set(gameIndex, userEdit); }

For the quit and save option, I use a try/catch structure as the standard to prevent the IO process from having any problems. This code successfully writes the current program’s ArrayList to a designated text file in the program folder.

if (currentChoice == 8){ System.out.println("Goodbye!"); try{ PrintWriter gameList = new PrintWriter("Game_List.txt"); for (int i=0;i<(games.size());i++){ gameList.println(games.get(i)); } gameList.close(); } catch (Exception ex) { ex.printStackTrace(); } }

End Of The Program

I end off the program with a simple goodbye message and the necessary closing braces to close out the while loop, main class and surrounding “Interface” class.

if (currentChoice == 9){ System.out.println("Goodbye!"); } } } }

Feel free to copy and paste all the above code in order to an appropriately named class and run it for yourself. Hopefully this can help you on your journey to learn Java or in your working project.

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[lbcd-me-blog]

BCTC - CIT-149 - Java I - Piggy Bank

So, a friend of mine is going about learning programming at a local college. This is something I generally support and therefore something that I'd be happy to help with in any fashion. I also asked if I could be given the coursework / homework, so that I could see the progression that it goes and do the work myself; so that I may be better able to understand where the course is and what is expected from the work. 

So, the first piece of work that I was given is called Piggy Bank. As expected from the first piece of homework that’s actually to do with programming, it’s a simple task that can certainly seem daunting at first.

So, the task is as follows;

Penny has been saving her birthday money for a “long time.” She opens her piggy bank to count her money. She has $5 bills, $1 bills, quarters, dimes,nickels, and pennies. You decide to write a program to help Penny count her money (and to practice your programming skills). Your program will ask Penny to enter how many $5 bills, $1 bills, quarters, dimes, nickels, and pennies she has and then it will calculate and display the total.

Requirements:

1. Use floating-point constants 5.00, 1.00, .25, .10, .05, and .01.

2. Use integer variables for the number of $5 bills, the number of $1 bills, the number of quarters, the number of dimes, the number of nickels, and the number of pennies that Penny has.

3. Use a floating-point variable for Penny’s total.

4. Format your input nicely so that it is VERY easy for Penny to enter her counts (one at a time). Do not have Penny enter all at once with commas between.

5. Format your output nicely so that Penny can easily read how much she has. Use something similar to:

Penny, you have a total of 15.32

6. Document your program well. Place a comment block at the beginning of your code that includes: Program name, Author, Date, Purpose of program

In my opinion, syntax is not something important to remember, instead it is important to understand concepts, logic and how to properly break down a task into smaller tasks in order to properly write out and structure the code into something meaningful.

The task set forth is about a number of different topics;

Constants

Floating Point Types

Input / Output Streams

Output Formatting

Now, I am actually acutely aware that I don’t actually know anything about what is in Chapter 1 of the textbook that they’re studying from. So, I might go into a bit more detail than they should already know (Output formatting, for example).

The first thing to do in any given task is to break down the problem into individual steps; into specific “units” of work that can be implemented individually. A task as a whole can be daunting, but understanding and focusing on smaller bits of code will make things easier and allow the mind to comprehend what work that is to do on that task.

A computer program / application is, at its core, a series of statements. Computers are, effectively, exceedingly stupid; they do exactly what they’re told line by line. Especially in beginner programs, the flow of an application is very simple and this allows for us to break things down step by step.

So, we need to break down this task into steps:

Define 6 Constants to represent Dollar Value of denominations

Five Dollar Bills (5.00)

One Dollar Bills (1.00)

Quarter (0.25)

Dime (0.10)

Nickel (0.05)

Pennies (0.01)

Create a Scanner to read from System.in

Create a variable to track the running total

For each of the denominations;

display a prompt

read numeric input representing how many of the current denomination Peggy has

multiply the input with the denomination dollar value

add that value to a running total

Display the running total to the screen

In theory, we have five steps for our program.

1. Define 6 Constants to represent Dollar Value of denominations 

A constant in Java is declared like a variable is, but on the main class and is a final static. This means that when you have declared the constant and assigned its value, it will always have that value. 

private final static float FIVE_DOLLAR_BILL = 5.00;

This type of constant is what can be referred to as a Named Constant. A Named Constant is a constant that represents a set value in a program; so instead of using a literal value (5.00) in potentially multiple places in the program, a single constant is used which can easily be changed.

For example, we may use FIVE_DOLLAR_BILL multiple times through a program. At sometime in the future, for some strange reason, the value of a FIVE_DOLLAR_BILL might change from 5.00 to 5.05. By just using the Named Constant, we only have to change this once instead of any number of times where we’ve hardcoded the 5.00 value.

This part also brings us to the used of the technical term “Floating Point Types”. A Floating Point Type is a numeric value that can have decimal points (1.00, 1.01, 2.034322002, 3.00), which are opposed to an Integer Type, which represents a number that cannot have a decimal point (1, 2, 3, 4...). An Integer Type is a variable of type int or long, while to represent a Floating Point Type we use a float or double. 

Currency is generally represented (at this stage) as a float or a long, as to capture the pennies. That is why we represent our dollar values as a float.

2. Create a Scanner to read from System.in

The Scanner is the way that we work with an InputStream. InputStream and OutputStream are two classes that are more complicated than this point requires, however at the base they are very simple:

An InputStream is a way of reading from a data source

An OutputStream is a way of writing to a data source

For all we care right now, our InputStream is System.in. System.in is an InputStream that we can use to wait for an input from the user on the command line.

Our OutputStream is called System.out. System.out writes to the command line.

Scanner scnr = new Scanner(System.in);

The Scanner class has a bunch of different methods to it, but mostly the one that’s important to know right now is scnr.nextInt(); This will wait for the user to input an integer and will return that input.

The Scanner that we have created will be our main use for reading any and all input.

3. Create a variable to track the running total

Variables are very important in all programs. Variables are how we track all manner of things, so in order to track the running total, we need ourselves a variable.

We know what the variable is for; so we have to determine what type it is (is it an int or is it a float?). Since we know we’re going to be tracking a monetary value which will definitely have decimal points, we can safely assume that we’ll be using a float. Especially as the spec says to use a Floating-Point Type, which as we figured out before is a float or a double.

It is very important to give variables descriptive (yet pithy) names in order to allow others to understand what exactly those variables are, as it is not always clear. While we could name our variable “foo”, “bar”, o”x”, “genericNumberOfChickenese” or something of that like, it would probably be better named with something simple, like “total”.

4. For Each Denomination...

At this point is the biggest part of the program. We have six different known denominations of money, for each one, we need to know how many Peggy has and use that knowledge to calculate the “value” of all that money, and add that to our running total.

Saying it in a run-on sentence like that makes it sound complicated. Breaking it down helps;

Display a Prompt

Read numeric input using our scanner. This is our quantity of that denomination.

Multiply the quantity by the value to get the denomination dollar value

Add the denomination dollar value to the running total

Essentially, we want to do the same thing six times, once for each denomination. This means that we’re going to be doing some repeated code, so we only really need to figure out just what we’re doing once.

Our first step (Display a Prompt) is about using System.out in order print to the console a nice and neat prompt that asks Peggy for input into the system. The main way we do this is through System.out.println(...) and System.out.print(...). The main difference between the two is that println will append a new line character to the end of the output, while print will not, allowing for further output or input to be on the same line.

The next step (Read numeric input using our scanner) utilises the scnr variable previously made in order to read in an integer. This integer represents the quantity of the current denomination that Peggy has. So, for example, if she had 4 five dollar notes, then she would input 4 and the scnr.nextInt() call would return the number (int) 4.

Now we have the quantity, we can do the next step (Multiply the quantity by the value) in order to order to determine the denomination dollar value, so we can continue onto the next step. This is a simple multiplication that we do between an Integer (quantity) and a Floating-Point Type (the Named Constant that represents the denomination). The most important thing to remember that whenever we multiply anything by a Floating-Point Type, we always get a Floating-Point Type.

So, a float multiplied by an int would always return a float.

The final step (Add the denomination dollar value to the running total) is a simple addition; our denomination dollar value is a float (as it is the product (multiplication) of an int (quantity) and a float (Named Constant that represents the denomination)).

As an example of this process:

Print the prompt “Enter how many five dollars you have: “

Read the next integer input into an int variable (quantity). This is input as 4.

Multiply quantity by FIVE_DOLLAR_VALUE (a float value of 5.00). This total is 20.00 and stored in a float variable called dollarValue.

Add dollarValue to the total value.

This process is then repeated for each other other denominations. At the end, total will contain the total of all denomination values.

5. Display the running total to the screen

I am not entirely sure if the textbook that is used goes over how to use the System.out method “printf”, which is a very useful tool for formatting strings and printing them out to the console.

Using printf will allow us to fix some problems with multiplying Floating-Point Type numbers. This can be seen by using String concatenation in order to output the total.

System.out.println(”Penny, you have saved $” + total);

This will do something that will look strange; it’ll output the total as having a strange decimal point value. For example, passing in 1 to all of the denominations will output the following:

Penny, you have a saved $6.4100003

This is because multiplying Floating-Point Types is actually a bit strange. So, instead, we can use the System.out.printf in order to format our string a bit better and also to limit our float.

System.out.printf allows us to format (the f stands for “format”) strings with variables. It’s very useful and interesting, but I suspect that it might be a bit out of the scope of this article.

System.out.printf("Penny, you have saved $%.2f", total);

The most interesting part of this string, of course, is “%.2f”. Running this program and seeing the output should get you the following;

Penny, you have saved $6.41

So, what has happened?

printf has number of Format Specifiers, though that might not actually what they’re called. These Specifiers start with % and end with a letter to declare what type of variable. Anything between the two is a flag. The terminology is not important.

“f” means that the variable is a float. “.2″ means that the float should be formatted to only two decimal places.

“%.2f” essentially means to replace the string with the first variable given (total) as a float to two decimal points.

MagicAnyway, that’s the break down of the program. Hopefully, this should be helpful and breaks things down to an understandable level.

Finally, here is my version of the program. Just for a reference.

[hasnainamjad]

Java is one of the most highly sought after programming languages, not to mention one of the two official languages for Android development. In this Java beginner course, we’ll go over the basics to provide you with a solid foundation and understanding of how the language works and what you can do with it.

Prerequisites

This Java beginner course assumes that you have no prior background in programming. In order to follow along however, you will need to use an online compiler. This will provide a terminal where you can enter Java code and then test your projects.

A good example can be found here: Repl.it. Otherwise, you can also find a number of Java compilers in the Google Play Store and Apple App Store.

Chosen your editor? Great, let’s get started!

Java beginner course part 1: Hello world!

Traditionally, when learning any new programming language, the first thing a tutorial should demonstrate, is how to print “Hello World!” to the screen. Depending on your chosen programming language, this can be a simple or complex process! Unfortunately, Java leans a little more toward the latter camp.

To achieve this seemingly basic task, you will need to enter the following code:

class Main { public static void main(String[] args) { System.out.println("Hello world!"); } }

Chances are you won’t need to write any of this though, seeing as most Java editors will populate new files with something to this effect for you. So, what does all this mean?

First, we are creating a “class” called “main”. Classes are chunks of code that are primarily used to create “data objects.” Data objects are comprised of properties and functions. For example, you could use a class to create a “bad guy” object in a program, and that would consist of its properties (2 legs, green color, lazer gun) and functions (walking, shooting, exploding). In Java, blocks of code that perform functions are called “methods.”

Also read: Java tutorial for beginners: write a simple app with no experience

However, classes can also be used to house sequences of statements that are carried out sequentially to make up a program. To define a class as the “main” class, the one that loads first when you hit run, it must also contain a method called “main”.

In Java, you group lines of code together using curly brackets and indentations. So if we say:

class Main {

Everything following that first curly bracket will be part of the main class and should be indented. We do the same thing for our main method, which means everything that is contained within both the class and the method will be double-indented. The method in this code is the block of code that starts “public static void”. The name that follows is what we want to call our method.

The code block ends when we use the opposite curly bracket. It’s important to remember how many curly brackets we opened, to ensure that we use the same number of closing brackets!

Arguments and syntax

You’ll notice that the method title is followed by a number of words in brackets. These are called “arguments” and they allow us to pass values in and out of the function. You don’t need to worry about that right now, just know that there always must be a “main” method, and that the main method must include those arguments.

Finally, we can use the statement (command) that prints “Hello world!” to the screen. We end that line with a semi-colon, which is how you end every line that doesn’t end with a curly bracket in Java. If you want to learn more about Java syntax and why it is the way it is, you can do so here:

An introduction to Java syntax for Android development

Doing a thing: introducing variables

So, we’re 500 words into this Java beginner course and we’ve yet to write a line of code. Time to rectify that!

We’re just going to add two lines, and change one of the lines to say something new:

class Main { public static void main(String[] args) { String name; name = "Mr Pimples"; System.out.println("Hello " + name); } }

What we have done here, is to create a new “string” with the title “name” and the value “Mr Pimples”. A string is a type of variable, which is essentially a word that can represent a piece of data. Variables come in all shapes and sizes; including “integers” which are whole numbers, and “floats” which are numbers with decimal points.

You may remember variables from math, where:

“if a + 5 = 7, a = 2”

Here, “a” represents a value (2) and can thus stand-in for that value.

Why is this useful? Because it then allows us to change what our code does, simply by changing the value of the variable. For example:

import java.util.Scanner; class Main { public static void main(String[] args) { String name; System.out.println("What's yer name??"); Scanner reader = new Scanner(System.in); name = reader.next(); System.out.println("Hello " + name); } }

Scanner reader is an object that lets us get information from the user input. Here, we are asking the user to input their name then assigning the “name” string the text they enter. We can respond to the user using that name, rather than just displaying a generic message!

Notice that the variable sits outside of the quotation marks, showing that we want the value of that string, rather than the word “name”.

(Wondering what “import java.util.Scanner” does? We’ll get there in a moment, but well done for being observant!)

Using methods

Now you have an idea of what a variable is, it’s time this Java beginner course moved on to methods!

A method is essentially a block of code that performs one or more jobs. The usefulness of a method, comes from the fact it can be called from anywhere in your code. This means you can perform the same job multiple times, without needing to write the code repeatedly. That also means that you can more easily make changes to your program – as you only need to change that code once.

To see how this works, let’s write another variation of our “Hello World!” code:

class Main { public static void main(String[] args) { helloMethod(); } public static void helloMethod() { System.out.println("Hello World!"); } }

This version of the program does the exact same thing it did before. The only difference is that the actual act of saying “Hello World!” is carried out in a separate method. This means we can repeatedly show the message to the screen by doing this:

public static void main(String[] args) { helloMethod(); helloMethod(); helloMethod(); }

Sure saves time!

The other great thing about methods that you need to learn on this Java beginner course though, is that they can behave differently each time.

This is where “arguments” come in. Basically, an argument is a variable that you pass over to a method, which can then change the way the method acts. When you define the method, you simply create new variables and insert them in the brackets. As before, we do this by writing the type of variable (String) and then its name (userName).

Now, when we call the helloMethod method, we need to put a string inside those brackets. Now we can do this:

import java.util.Scanner; class Main { public static void main(String[] args) { String name; System.out.println("What's yer name??"); Scanner reader = new Scanner(System.in); name = reader.next(); helloMethod(name); } public static void helloMethod(String userName) { System.out.println("Hello " + userName); } }

Or this:

helloMethod("Mr Pimples"); helloMethod("Mrs Mumples"); helloMethod("Johnny");

Using classes

In the next part of this Java beginner course, we’re going to do something completely different: build a rabbit!

To do that, you’re going to create a new class outside of all the curly brackets so far:

class Rabbit { public String rabbitName; public String rabbitColor; public int rabbitWeight; public Rabbit(String name, String color, int weight) { rabbitName = name; rabbitColor = color; rabbitWeight = weight; } public void feed() { rabbitWeight = rabbitWeight + 10; } }

Whenever you create a new class other than your main class, you will need to use a Method called a “constructor.” This constructor is used to define the properties of the “object” you are going to create. Remember: classes exist predominantly to create data objects, and in this case, we are creating a rabbit.

We therefore need to define a bunch of different variables for our rabbit, which we do outside of the method. Then we need to assign values to those variables by using them as arguments in our constructor. What this allows us to do is determine what our rabbit will be like.

(Notice that integers use the lower-case “int” whereas “String” is in upper case – this is unique to the String variable).

Now, back in the Main class and main method, we’re going to do the following:

Rabbit bunny1 = new Rabbit("Barry", "Brown", 10); Rabbit bunny2 = new Rabbit("Jerry", "Black", 11); System.out.println(bunny1.rabitName);

Basically, we’re using the constructor to make two separate “data objects” of the type “Rabbit.” We do this in just the same way we created our variables earlier, except that we’re using the constructor to assign multiple values.

The great thing about creating objects using classes, is that you can build multiple objects from a single class. Here, the class works like a “blueprint.” So we can create two different rabbits with different names, different colors, and different weights!

Public methods

The other thing you may have noticed, is that we have a method in our Rabbit class called “feed.” Feed is a method that let’s us feed our rabbits, and all it does is add a pound in weight to our rabbitWeight variable.

Remember: objects have properties and functions. Or to put it another way: variables and methods!

So if we say:

System.out.println(bunny1.rabbitWeight); bunny1.feed(); System.out.println(bunny1.rabbitWeight);

We’ll see that our bunny is one heavier when it prints out the second line!

Now, making data rabbits is not all that useful of course. But what would be useful would be to make a score counter in a computer game, to make users in a contact management tool, or to make any number of other abstract constructs.

The power of Java

The reason I really wanted to explain classes and objects in this Java beginner course, is that it will help you to better understand the nuts and bolts of Java and many other programming languages.

Because whenever you look at a piece of Java code, you will likely see many statements that rely on methods and variables from other classes. Java has a bunch of classes “built-in” and it’s easy to add more as you need them.

For instance: when we print to the screen by using:

System.out.println(bunny1.rabbitName);

We are referring to a class called System and then using its print line method! We’re then passing the string we want to print as an argument. That’s why we need so many words and full stops to achieve something seemingly quite simple.

The reason that “String” is capitalized, is that this is actually an object, rather than a “primitive type.” Hence, we can do things like String.length in order to find out how long the string is! Classes are generally capitalized.

Additional libraries and classes

We can easily extend the capabilities of Java without writing lots of extra code, by “importing” additional classes. This is what we did in order to get the input from the user:

import java.util.Scanner;

The importance of classes and objects also explains a lot of the “boilerplate” code (code that you write over and over again). The reason we say “public” is that we are telling Java we want other classes to be able to access the method. The opposite is “private” which means that the method is confined to the class, usually because it is concerned with some inner-workings that shouldn’t be tampered with.

The phrase “static” meanwhile tells Java that a method acts on the program as a whole, rather than an “instance” of a particular object. Our “feed”

Don’t worry if this isn’t all clicking just yet. It can take quite a while before Java starts making sense! But hopefully this gives you at least some idea as to what you’re looking at when you read any page of Java code.

Returning values

So, what does “void” mean?

Void tells us that a method doesn’t return any kind of value. This is as compared with methods that return a variable.

For example: what happens if we want to talk to our rabbit? In that case, we might create a method that returns a string, where that string contains the message that the bunny wants to share:

public String rabbitSays() { String iSay = "Hi, my name is " + rabbitName; return iSay; }

When we define the method as a String, it’s important that it it uses the return statement as the last line in order to return that string.

Now, we can treat that method as though it were any other string:

System.out.println(bunny1.rabbitSays());

Flow control

Before we wrap up this Java beginner course, there’s one more concept that’s important to understand: flow control.

Flow control means that we can change the code that runs depending on the value of a variable. This allows us to respond to the interactions provided by the user, or to other factors such as the time of day, external files, or how long the program has been running.

For example, we might assume that our bunny is hungry if he’s below a certain weight. He would therefore want to tell us to feed him!

This is where an “if” statement comes in handy. If statements are code blocks that run only when certain conditions are met. These conditions are placed inside brackets. So:

String iSay; if (rabbitWeight < 11) { iSay = "I'm hungry! Feed me!"; }

Note that the symbol “<” means “less than.” Therefore, we only run the code in the code block if the rabbit’s weight is less than 11.

Another useful statement is “else” which we can use immediately after an “if” statement in order to define what happens when the conditions are not met:

String iSay; if (rabbitWeight < 11) { iSay = "I'm hungry! Feed me!"; } else { iSay = "Hi, my name is " + rabbitName; }

Now our rabbits will tell us they’re hungry until they get fed. Once they are over 10lbs, they’ll stop telling us to feed them and tell us their names instead.

Here’s the entire code:

class Main { public static void main(String[] args) { Rabbit bunny1 = new Rabbit("Barry", "Brown", 10); Rabbit bunny2 = new Rabbit("Jerry", "Black", 11); System.out.println(bunny1.rabbitSays()); bunny1.feed(); System.out.println(bunny1.rabbitSays()); } } class Rabbit { public String rabbitName; public String rabbitColor; public int rabbitWeight; public Rabbit(String name, String color, int weight) { rabbitName = name; rabbitColor = color; rabbitWeight = weight; } public void feed() { rabbitWeight = rabbitWeight + 1; } public String rabbitSays() { String iSay; if (rabbitWeight < 11) { iSay = "I'm hungry! Feed me!"; } else { iSay = "Hi, my name is " + rabbitName; } return iSay; } }

While this particular program is little more than a novelty, it’s easy to see how you might adapt this into a full “pet simulator” like a Tamagotchi. Except – and I’m just spitballing here – the challenge would be that we have multiple different rabbits to manage. Add a “poop” function to make them hungry again, let them procreate, and you have a fun little management game.

Add some graphics and you’re onto a winner! Not bad for a Java beginner course!

Wrapping up the Java beginner course

All that is a lot to take in in one go, so you shouldn’t worry if you’re struggling to get your head around it all. That said, these are the most important concepts in Java and, once you grasp them, you’re well on your way to creating more useful apps.

In fact, that’s the best way to learn: choose a good starter project and get stuck in. Research what you don’t know and add to your knowledge as you go! Hopefully, you’ll find that it all makes a little more sense thanks to this Java beginner course.

OR you could check out our list of the best free and paid Android app development courses. There, you’ll not only learn everything you need to know about Java, but also how to use the Android SDK that bridges the gap between Java and the Android platform!

source https://www.androidauthority.com/java-beginners-course-1146854/

[hudabiyafatima]

.In this tutorial we will gonna see how many Methods of Input & How to use them. And also learn How to accept input from user. For this We are using Scanner class to get the input.

Scanner is a class in java.util package is used for obtaining the input from user.It is the easiest way to read input in a java program.

[rafi1228]

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[knowledgewiki]

checking the input for primitive data types in java

I was given to code a program that would take input of a number and check, in which all primitive data types(byte, short, int, long) it will fit in. I wrote the following code but it is not passing all the test cases:

import java.util.*; import java.io.*; class Solution { public static void main(String []args) { Scanner sc = new Scanner(System.in); int t=sc.nextInt(); for(int i=0;i<t;i++) { try { long x=sc.nextLong(); System.out.println(x+" can be fitted in:"); if(x>=-Byte.MAX_VALUE && x<=Byte.MAX_VALUE) System.out.println("* byte"); if(x>=-Short.MAX_VALUE && x<=Short.MAX_VALUE) System.out.println("* short"); if(x>=-Integer.MAX_VALUE && x<=Integer.MAX_VALUE) System.out.println("* int"); if(x>=-Long.MAX_VALUE && x<=Long.MAX_VALUE) System.out.println("* long"); } catch(Exception e) { System.out.println(sc.next()+" can't be fitted anywhere."); } } } }

3 Answers

Of course it’ll fail. Take a byte. In Java, it is represented as a signed 8bit value (2’s complement notation). It means its range varies from -128 to +127. You logic says that it’ll be a byte if it lies b/w (inclusive of both sides), -127 to +127. It’ll fail for -128.

Replace -Byte.MAX_VALUE with Byte.MIN_VALUE and it’ll work.

You should be using if … else logic here, to prevent a given input from matching more than one case:

long x = sc.nextLong(); System.out.println(x+" can be fitted in:"); if (x >= Byte.MIN_VALUE && x <= Byte.MAX_VALUE) { System.out.println("* byte"); } else if (x >= Short.MIN_VALUE && x <= Short.MAX_VALUE) { System.out.println("* short"); } else if (x >= Integer.MIN_VALUE && x <= Integer.MAX_VALUE) { System.out.println("* int"); } else if (x >= Long.MIN_VALUE && x <= Long.MAX_VALUE) { System.out.println("* long"); } else { System.out.println("value does not fit any type"); }

I hope if you give a value which can’t be taken by a long variable, the value will wrap around between Long.MAX_VALUE & Long.MIN_VALUE. What i can suggest is, get the input as a string from the user and construct BigDecimal and compare the range values of the primitives with the BigDecimal Values using some builtin methods.

Archive from: https://stackoverflow.com/questions/59064051/checking-the-input-for-primitive-data-types-in-java

from https://knowledgewiki.org/checking-the-input-for-primitive-data-types-in-java/

[felord]

SOLVED:P2: Interactive PlayList Analysis Solution

In this assignment, you will develop an application that manages a user's songs in a simplified playlist. Objectives Write a class with a main method (PlayList). Use an existing, custom class (Song). Use classes from the Java standard library. Work with numeric data. Work with standard input and output. Specification Existing class that you will use: Song.java Class that you will create: PlayList.java Song (provided class) You do not need to modify this class. You will just use it in your PlayList driver class. You are given a class named Song that keeps track of the details about a song. Each song instance will keep track of the following data. Title of the song. The song title must be specified when the song is created. Artist of the song. The song artist must be specified when the song is created. The play time (in seconds) of the song. The play time must be specified when the song is created. The file path of the song. The file path must be specified when the song is created. The play count of the song (e.g. how many times has the song been played). This is set to 0 by default when the song is created. The Song class has the following methods available for you to use: public Song(String title, String artist, int playTime, String filePath) -- (The Constructor) public String getTitle() public String getArtist() public int getPlayTime() public String getFilePath() public void play() public void stop() public String toString() To find out what each method does, look at the documentation for the Song class: java docs for Song class PlayList (the driver class) You will write a class called PlayList. It is the driver class, meaning, it will contain the main method. In this class, you will gather song information from the user by prompting and reading data from the command line. Then, you will store the song information by creating song objects from the given data. You will use the methods available in the song class to extract data from the song objects, calculate statistics for song play times, and print the information to the user. Finally, you will use conditional statements to order songs by play time. The ordered "playlist" will be printed to the user. Your PlayList code should not duplicate any data or functionality that belongs to the Song objects. Make sure that you are accessing data using the Song methods. Do NOT use a loop or arrays to generate your Songs. We will discuss how to do this later, but please don't over complicate things now. If you want to do something extra, see the extra credit section below. User input Console input should be handled with a Scanner object. Create a Scanner using the standard input as follows: Scanner in = new Scanner(System.in); You should never make more than one Scanner from System.in in any program. Creating more than one Scanner from System.in crashes the script used to test the program. There is only one keyboard; there should only be one Scanner. Your program will prompt the user for the following values and read the user's input from the keyboard. A String for the song title. A String for the song artist. A String for the song play time (converted to an int later). A String for the song file path. Here is a sample input session for one song. Your program must read input in the order below. If it doesn't, it will fail our tests when grading. Enter title: Big Jet Plane Enter artist: Julia Stone Enter play time (mm:ss): 3:54 Enter file name: sounds/westernBeat.wav You can use the nextLine() method of the Scanner class to read each line of input. Creating Song objects from input As you read in the values for each song, create a new Song object using the input values. Use the following process to create each new song. Read the input values from the user into temporary variables. You will need to do some manipulation of the playing time data. The play time will be entered in the format mm:ss, where mm is the number of minutes and ss is the number of seconds. You will need to convert this string value to the total number of seconds before you can store it in your Song object. (Hint: use the String class's indexOf() method to find the index of the ':' character, then use the substring() method to get the minutes and seconds values.) All other input values are String objects, so you can store them directly in your Song object. Use the Song constructor to instantiate a new song, passing in the variables containing the title, artist, play time, and file path. Because a copy of the values will be stored in your song objects, you can re-use the same temporary variables when reading input for the next song. Before moving to the next step, print your song objects to make sure everything looks correct. To print a song, you may use the provided toString method. Look at the Song documentation for an example of how to print a song. NOTE: Each Song instance you create will store its own data, so you will use the methods of the Song class to get that data when you need it. Don't use the temporary variables that you created for reading input from the user. For example, once you create a song, you may retrieve the title using song1.getTitle(); Calculate the average play time. Use the getPlayTime() method to retrieve the play time of each song and calculate the average play time in seconds. Print the average play time formatted to two decimal places. Format the output as shown in example below. Average play time: 260.67 Use the DecimalFormat formatter to print the average. You may use this Find the song with play time closest to 4 minutes Determine which song has play time closest to 4 minutes. Print the title of the song formatted as shown in the output below. Song with play time closest to 240 secs is: Big Jet Plane Build a sorted play list Build a play list of the songs from the shortest to the longest play time and print the songs in order. To print the formatted song data, use the toString() method in the Song class. Print the play list as shown in the output below. ============================================================================== Title Artist File Name Play Time ============================================================================== Where you end Moby sounds/classical.wav 198 Big Jet Plane Julia Stone sounds/westernBeat.wav 234 Last Tango in Paris Gotan Project sounds/newAgeRhythm.wav 350 ============================================================================== Extra Credit (5 points) You may notice that you are repeating the same code to read in the song data from the user for each song (Yuck! This would get really messy if we had 10 songs). Modify your main method to use a loop to read in the songs from the user. As you read and create new songs, you will need to store your songs in an ArrayList. This can be quite challenging if you have never used ArrayLists before, so we recommend saving a backup of your original implementation before attempting the extra credit. Getting Started Create a new Eclipse project for this assignment and import Song.java into your project. Create a new Java class called PlayList and add a main method. Read the Song documentation and (if you are feeling adventurous) look through the Song.java file to familiarize yourself with what it contains and how it works before writing any code of your own. Start implementing your Song class according to the specifications. Test often! Run your program after each task so you can find and fix problems early. It is really hard for anyone to track down problems if the code was not tested along the way. Sample Input/Output Make sure you at least test all of the following inputs. Last Tango in Paris Gotan Project 05:50 sounds/newAgeRhythm.wav Where you end Moby 3:18 sounds/classical.wav Big Jet Plane Julia Stone 3:54 sounds/westernBeat.wav Where you end Moby 3:18 sounds/classical.wav Last Tango in Paris Gotan Project 05:50 sounds/newAgeRhythm.wav Big Jet Plane Julia Stone 3:54 sounds/westernBeat.wav Big Jet Plane Julia Stone 3:54 sounds/westernBeat.wav Last Tango in Paris Gotan Project 05:50 sounds/newAgeRhythm.wav Where you end Moby 3:18 sounds/classical.wav Submitting Your Project Testing Once you have completed your program in Eclipse, copy your Song.java, PlayList.java and README files into a directory on the onyx server, with no other files (if you did the project on your computer). Test that you can compile and run your program from the console in the lab to make sure that it will run properly for the grader. javac PlayList.java java PlayList Documentation If you haven't already, add a javadoc comment to your program. It should be located immediately before the class header. If you forgot how to do this, go look at the Documenting Your Program section from lab . Have a class javadoc comment before the class (as you did in the first lab) Your class comment must include the @author tag at the end of the comment. This will list you as the author of your software when you create your documentation. Include a plain-text file called README that describes your program and how to use it. Expected formatting and content are described in README_TEMPLATE. See README_EXAMPLE for an example. Submission You will follow the same process for submitting each project. Open a console and navigate to the project directory containing your source files, Remove all the .class files using the command, rm *.class. In the same directory, execute the submit command for your section as shown in the following table. Look for the success message and timestamp. If you don't see a success message and timestamp, make sure the submit command you used is EXACTLY as shown. Required Source Files Required files (be sure the names match what is here exactly): PlayList.java (main class) Song.java (provided class) README Section Instructor Submit Command 1 Luke Hindman (TuTh 1:30 - 2:45) submit lhindman cs121-1 p2 2 Greg Andersen (TuTh 9:00 - 10:15) submit gandersen cs121-2 p2 3 Luke Hindman (TuTh 10:30 - 11:45) submit lhindman cs121-3 p2 4 Marissa Schmidt (TuTh 4:30 - 5:45) submit marissa cs121-4 p2 5 Jerry Fails (TuTh 1:30 - 2:45) submit jfails cs121-5 p2 After submitting, you may check your submission using the "check" command. In the example below, replace submit -check Read the full article

[inlarn]

Write a java program to print a number from the user. In the Java program, print the value obtained from the user.  

https://inlarn.com/write-a-java-program-to-print-a-number-from-the-user/

This is the first step in learning,  how to print a number in the Java programming language. For beginners, these are the simple java program to print and how to run them in java.

What is integer in java program

In Java, an int is a primitive data type, but an Integer is a Wrapper class. Because int is a basic data type, it has little flexibility.

Only the binary value of an integer may be stored in it. Integer variables, like any other reference type, store references to Integer objects.

What is scanner in java and why it is needed?

The scanner is a class in the Java util package that is used to get the input of primitive kinds such as int, double, and strings.

It’s the simplest way to read input in a Java program, but it’s not particularly efficient if you’re looking for an input method for situations where time is a factor, such as competitive programming.

It implies importing all of Java’s classes and interfaces. Make the utilities in the util package available for usage within the current class or interface.

This is a shortcut wildcard annotation for importing all classes included within a certain package. This will not import the classes from the java sub-packages.

What is package in java programming and its uses?

A package is a namespace that groups together a collection of related classes and interfaces. Because software built in the Java programming language might have hundreds or thousands of distinct classes, it makes it logical to group similar classes and interfaces into packages to keep things organized.

In Java, a package is used to bring together similar classes. Consider it a folder in a file system. Packages help us avoid name clashes and produce more maintainable code.

[batexamin]

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Site Galleria offers Best Java Training in Dubai with most experienced professionals. Our Instructors are working in Java and related technologies for many years in MNC's.

CORE JAVA AND ADVANCED JAVA TRAINING

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After completing Java/J2EE training from our institute candidates will be capable to create full fledge Java/ J2EE application. We cover all the major aspect of Java which is required to develop cutting edge applications using the latest version of J2EE, J2SE, and J2ME and various Java development IDEs i.e. Eclipse, NetBeans etc.

5 most popular training course in UAE

Core Java Syllabus in Dubai

Module 1: Introduction

Java Why? What? How? When? Where?

Different Java Versions.

How Java is different from other Technologies

Module 2: Introduction To Java Programming Environment

How to Install & set Path.

A Simple Java Program

Compiling & executing Java Program

Phases of Java Program

Analysis of a Java Program

Understanding Syntax and Semantic Error,

Runtime Exception

Name of a Java Source File

Platform Independency

Java Technology (JDK, JRE, JVM, JIT)

Features of Java

Text Editors

Consoles

Module 3: Fundamentals of Java Programming

Naming convention of Java language

Comments

Statements

Blocks (Static, Non-static/instance)

Identifiers

Keywords

Literals

Primitive Data Types, Range

Reference (User defined) Data type

Variables (Primitive, Reference)

Type Casting, Default Value

Operators

Program/Interview questions

Module 4: Control Structures

Working with Control Structures

Types of Control Structures

Decision Control Structure (if, if-else, if else if, switch –case)

Repetition Control Structure (do –while,while, for)

Program/Interview questions

Module 5: Input Fundamentals And Datatypes In Java

Java program inputs from Keyboard

Methods of Keyboard inputs

Scanner, Buffered Reader

Problem Solving

Java Array

What is Array

Array Declaration in java vs C and C++.

Instantiation of an Array

String vs character array.Accessing Array

Elements, Default Value, for-each loop, varargs

Length of an Array (What is –Array Index Out Of Bounds Exception)

Increasing, Decreasing the Size and Copy of an Array

Multi-Dimensional Arrays

Program/Interview questions

Program/Interview questions Difference between C and C++ with Java

Application Compilation and Run

Interview related Question and Answer

Module 6: Object Oriented Programming (Oops Concepts In Deep)

Procedural Vs Object Oriented Program

Different type of Program Procedural Vs Object Oriented.

Top Down Vs Bottom Up Approach

Introduction to Object Oriented

Abstraction, Encapsulation, Inheritance,

Polymorphism.

Introduction to Classes and Objects

Custom Class Definition

Instance and Static Variables

Different ways to create Object Instance

Instance Variable and it's role in a Class

Constructors, types of Constructor,

Constructor Rule, Constructor Overloading

Static Variable and it's use.

Methods and their behavior.

Constructor vs Methods

Constructors

“this” Keyword

Java Access Modifiers (and Specifiers)

Programming Interview related Question and Answer

Call by value, Call by reference

Module 7: Command-Line Arguments

What is a Command-Line Argument?

Java Application with Command-Line Arguments

Conversion of Command-Line Arguments

Passing Command-Line Arguments

Using methods (Static , Non Static)

Loading...

Module 8: Integrated Development Environment

Using various Editors

Program Compilation, Execution in Editor

Using Eclipse IDE

Project Set Up

Source File Generation

Application Compilation and Run

Module 9: Inner Class

First View of Inner Class

Outer Class Access

Types of Inner Class

Module 10: Inheritance

Complete concepts of Inheritance

Sub-Classes

Object Classes

Constructor Calling Chain

The use of "super" Keyword

The use of “private” keyword inheritance.

Reference Casting

Module 11: Abstract Classes and Inheritance

Introduction to Abstract Methods

Abstract Classes and Interface

Interface as a Type

Interface v/s Abstract Class

Interface Definition

Interface Implementation

Multiple Interfaces' Implementation

Interfaces' Inheritance

How to create object of Interface

Module 12: Polymorphism

Introduction to Polymorphism

Types of Polymorphism

Overloading Methods

Overriding Methods

Hiding Methods

Final Class and Method

Polymorphic Behavior in Java

Benefits of Polymorphism

“Is-A” vs “Has-A”

Association Vs Aggregation

Interview related Question and Answer.

Module 13: Package

Package and Class path and its use

First look into Packages

Benefits of Packages

Package Creation and Use

First look into Class path

Class path Setting

Class Import

Package Import

Role of public, protected, default and private w.r.t package

Namespace Management

Package vs. Header File

Creating and Using the Sub Package

Sources and Class Files Management

Module 14: Using Predefined Package & Other Classes

Java.lang Hierarchy

Object class and using toString(), equals(),hashCode(), clone(), finalize() etc

Using Runtime Class, Process Class to play music, video from Java Program

Primitives and Wrapper Class

Math Class

String, StringBuffer, StringBuilder Class

String Constant Pool

Various usage and methods of String,StringBuffer, StringBuilder

Wrapper Classes

System Class using gc(), exit(), etc.

Module 15: New Concepts In Package

Auto boxing and Auto unboxing

Static import.

Instance of operator.

Enum and its use in Java

Working with jar

Module 16: Garbage Collection

Garbage Collection Introduction

Advantages of Garbage Collection

Garbage Collection Procedure

Java API

Interview related Question and Answer

Module 17: Exception Handling

Introduction to Exceptions

Effects of Exceptions

Exception Handling Mechanism

Try, catch, finally blocks

Rules of Exception Handling

Exception class Hierarchy, Checked &

Unchecked Exception

Throw & throws keyword

Custom Exception Class

Chained Exception.

Resource handling & multiple exception class

Interview related Question and Answer.

Module 18: Multithreading

Introduction

Advantages

Creating a Thread by inheriting from Thread class

Run() and start() method.

Constructor of Thread Class

Various Method of Thread Class

Runnable Interface Implementation

Thread Group

Thread States and Priorities

Synchronization method, block

Class & Object Level Lock

Deadlock & its Prevention

Inter thread Synchronization

Life Cycle of Thread

Deprecated methods : stop(), suspend(),resume(), etc

Interview related Question and Answer

Module 19: Input and Output Streams

Java I/O Stream

I/O Stream - Introduction

Types of Streams

Stream Class Hierarchy

Using File Class

Copy and Paste the content of a file

Byte Streams vs Character Streams

Text File vs Binary File

Character Reading from Keyboard by Input Stream Reader

Reading a Line/String from Keyboard by Buffered Reader

Standard I/O Streams Using Data Streams to read/write

primitive data

PrintStream vs PrintWriter Using StreamTokenizer and RandomAccessFile

Interview related Question and Answer

Module 20: Serialization

Introduction to Serialization

Using Object Streams to read/write object

Transient Keyword

Serialization Process

Deserialization Process

Interview related Question and Answer

Module 21: Collection Framework

Generics(Templates)

What is generic

Creating User defined Generic classes

The java.util package

Collection

What is Collection Framework

List, Set & Map interfaces

Using Vector, Array List, Stack,

Linked List, etc.

Using Collections class for sorting

Using Hashtable, Hash Map, Tree Map,

SortedMap, LinkedHashMap etc.

Iterator, Enumerator.

Using Queue, Deque, SortedQue, etc.

Using HashSet, TreeSet, LinkedHashSet etc

Using Random class

Using Properties in a Java Program

Using user defined class for DataStructure

Using Date and Formatting Date class.

Interview related Question and Answer

Module 22: Advanced Java Syllabus

Module 1: JDBC

Introduction to JDBC

Databases and Drivers

Types of Driver

Loading a driver class file

Establishing the Connection to different

Database with different Driver

Executing SQL queries by ResultSet, Statements , Prepared Statment interface.

Using Callable Statement

Transaction Management & Batch Update

Programs/Interview related Question and Answer

Module 2: JSP

· Basics Of Jsp

Life cycle of JSPJSP APIJSP in Eclipse and other IDE'sPrograms/Interview related Question and Answer.

· Scripting Elements

scriptlet tagexpression tagdeclaration tagPrograms/Interview related Question and Answer.

· Implicit Objects

outrequestresponseconfigapplicationsessionpageContextpageexceptionPrograms/Interview related Question and Answer.

· Directive Elements

page directiveinclude directivetaglib directivePrograms/Interview related Question and Answer.

· Exception Handling

· Action Elements

jsp:forwardjsp:includeBean classjsp:useBeanjsp:setProperty & jsp:getPropertyDisplaying applet in JSP

· Expression Language

What is expression and how to use itDefine expression and use over the service flowThe way to be achieve same in JSP

· Mvc In Jsp

MVC patternWorking flow implementation of MVCCRUD operation using MVCDesign a real time web application using MVC

· JSTL

Discussion on the tag libraryHow to implement and use

· Custom Tags

Custom Tag : What and Why?Custom Tag API?Custom Tag ExampleAttributesIterationCustom URI

Module 3: Servlet

Basics of Servlet

Servlet: What and Why?

Basics of Web

Servlet API

Servlet Interface

GenericServlet

HttpServlet

Servlet Life Cycle

Working with Apache Tomcat Server

Steps to create a servlet in Tomcat

How servlet works?

servlet in Myeclipse

servlet in Eclipse

servlet in Netbeans

· Servlet request

Servlet Request methodsRegistration example with DB

· Servlet Collaboration

Request Dispatchersend Redirect

· Servlet Configure

Servlet Configure methodsServlet Configure example

· Servlet Context

Servlet Context methodsServlet Context example

· Session Tracking

CookiesHidden Form FieldURL RewritingHttpSession

Loading...

Module 4: Concurrent and implementation of collection

Implemenation of ArrayList

Implemenation of LinkedList

Implemenation of HashMap

Implementation of Queue/PriorityQueue/Deque

Module 5: Advanced Multi-Threading

Implemenation of Executor pool service and working mechanism with real time

Big file(Single , multiple ) processing using multiple thread

Implemenation to achieve thread class and runnable interface

Module 6: Javamail

Sending Email

Sending email through Gmail server

Receiving Email

Sending HTML content

Module 7: Design Pattern

Singleton

DAO

DTO

MVC

Front Controller

Factory Method

Abstract

etc

Module 8: Junit

JUnit: What and Why?

Annotations used in JUnit

Assert class

Test Cases

Module 9: Maven

Maven: What and Why?

Ant Vs Maven

How to install Maven?

Maven Repository

Understanding pom.xml

Maven Example

Maven Web App Example

Maven using Eclipse

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Hit our organization to ascertain the catalog of companies our candidates are recruited in. The Java training at Site Galleria offers theoretical based study emphasized with hands-on sessions. Seeking our custom as well as standard courses, you can turn out to be an expert application developer from a novice.

Related Search Term

Java Training in Dubai

Which is the best institute for Java training in Dubai?

Core and Advanced Java Training Institute in Dubai

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Java Training Locations in Dubai

Site Galleria branches in Dubai are listed above. And most popular locations where students / professionals are lining up to get trained with us.

[rahul124-world-blog]

How to take input from user in java

In this tutorial, we are gonna see how to accept input from a user. We are using Scanner class to get the input. In the below example we are getting input String, integer and a float number. For this we are using the following methods: 1) public String nextLine(): For getting input String 2) public int nextInt(): For integer input 3) public float nextFloat(): For float input

Example :

import java.util.Scanner; class GetInputData {  public static void main(String args[])  {     int num;     float fnum;     String str;     Scanner in = new Scanner(System.in);     //Get input String     System.out.println("Enter a string: ");     str = in.nextLine();     System.out.println("Input String is: "+str);     //Get input Integer     System.out.println("Enter an integer: ");     num = in.nextInt();     System.out.println("Input Integer is: "+num);     //Get input float number     System.out.println("Enter a float number: ");     fnum = in.nextFloat();     System.out.println("Input Float number is: "+fnum);  } }

output: Enter a string: Chaitanya Input String is: Chaitanya Enter an integer: 27 Input Integer is: 27 Enter a float number: 12.56 Input Float number is: 12.56

[codedistrict-blog]

Connecting to a server with Java

First, in order to connect to a server you need an endpoint connection between your machine and the server. This can be easily done using the Socket class in Java.

To implement it, we start by trying to create a stream socket that connects to a local host at a specified port.

Socket socket = new Socket(String host, int port);

After a stream is created, we want to communicate with the server. Let's say we are intrested in reading the available data on the server and printing it to the user. To do so, we first need to get an input stream for reading bytes from this socket.

InputStream is = socket.getInputStream();

Finally, we want to produce values scanned from the input stream, and convert them into characters using a specified charset

Scanner scan = new Scanner(is, "UTF-8");

Last, we keep on checking if the scanner has detected any next line, if so scan it and print it

The final code should look like the following:

This program connect to the atomic clock in Boulder, Colorado and return rhe time