#oops&java

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hand to forehead. bracing inhale. LOS endearing as always

look at their little Two Eyes expressive display format

look at their little ‼️😰 expressive display format

everybody outta the way look at their HEART 💙 !!! well i 💙 them sm so amped

p.s. fun to put joke coding but showing different languages' formats

[xploreitcorp5]

 How Do Job Descriptions for Java Developers Look?

1. Introduction to Java Job Descriptions  

Getting a grip on job descriptions is key to moving forward in your career. When students want to know what Java developer job descriptions look like, it's helpful to break it down into skills, experience, and job expectations. Whether you're just starting a Java course in Coimbatore or finishing a java Full Stack Developer Course, job descriptions can help you connect your learning with what employers want. They typically list out responsibilities, required skills, and educational background.  

Key Points: 

- Common skills include Core Java, Spring, Hibernate, and tools for version control.  

- Levels include Entry-level, mid-level, or senior roles.  

- Keywords: Java for beginners, Learn Java step by step, Java internship for students  

2. Core Skills Listed in Job Descriptions  

A frequent question is what core skills are expected in Java job descriptions. Employers usually look for solid knowledge of Java syntax, object-oriented programming, data structures, and algorithms. These are basics you’ll cover in foundational Java training in Coimbatore.  

Key Points:  

- OOP concepts like inheritance, polymorphism, and abstraction are often must-haves.  

- Java basics are essential for job readiness.  

- Keywords: Java basics for students, Java tutorials for students, Java course with placement  

3. Frameworks and Tools Required  

Modern job postings often emphasize the need for skills in frameworks like Spring Boot and Hibernate. Familiarity with version control (like Git), build tools (like Maven), and IDEs (like Eclipse or IntelliJ) is usually required. If you're taking a Full Stack Developer Course in Coimbatore, you'll likely learn these tools.  

Key Points 

- Full stack Java includes front-end knowledge like HTML, CSS, and JavaScript.  

- These frameworks are often covered in full-stack courses.  

- Keywords: Java crash course, Java full stack course for students, Java online learning  

4. Experience Level and Projects  

Most employers specify the experience level in their job ads. A common phrase is Entry-level Java developer with 0-2 years of experience. Mini projects and internships are often counted as relevant experience for newcomers.  

Key Points:  

- Java mini projects can enhance your resume.  

- Internships are a valuable way for students to gain industry exposure.  

- Keywords: Java mini projects, Java internship for students, Java programming course near me  

5. Educational Qualifications & Certifications  

Most job ads request a B.E./B.Tech in Computer Science or something similar. Having certifications can really help, especially when it comes down to choosing between similar candidates. If you’re taking a Java certification course in Coimbatore, that's a plus.  

Key Points:  

- Java coaching classes help prepare you for certifications.  

- Certifications boost credibility for entry-level Java jobs.  

- Keywords: Java certification course, Java coaching classes, Easy Java programming  

6. Job Roles and Responsibilities  

As you look into Java job descriptions, you'll notice they commonly mention tasks like code development, testing, bug fixes, and integration. These tasks are part of what you would learn in any Java training program in Coimbatore.  

Key Points: 

- You’ll need to write clean, scalable Java code.  

- Understanding of SDLC and Agile is often required.  

- Keywords: Java developer jobs for freshers, Java job interview questions, Java tutorials for students  

7. Soft Skills and Team Collaboration  

In addition to technical skills, job descriptions often mention the importance of communication and teamwork. A Full Stack Developer Course in Coimbatore might focus on soft skills to make students ready for the job market.  

Key Points:  

- Being a team player and communicating well is important.  

- Employers often look for a problem-solving mindset.  

- Keywords: Java course with placement, Affordable Java course, Java for beginners  

8. Learning Opportunities and Growth  

Employers often discuss opportunities for growth in their job postings. So when you wonder what Java job descriptions include, think about the chances for learning and advancing your skills.  

Key Points:  

- There's potential to move up into senior roles.  

- Continuous learning is often encouraged through various workshops.  

- Keywords: Learn Java step by step, Java online learning, Java weekend classes  

9. Location, Salary, and Work Conditions  

Job descriptions often specify locations, such as Java developer jobs in Coimbatore, and discuss work conditions, remote options, and salary ranges. This is especially important for students seeking roles after a Java course.  

Key Points:

- The IT sector in Coimbatore is on the rise and hiring Java developers.  

- Weekend classes can accommodate working students.  

- Keywords: Java weekend classes, Java developer jobs for freshers, Java job interview questions  

10. Conclusion  

In summary, if you’re still curious about Java job descriptions, they typically focus on technical skills, real-world experience, and soft skills. Courses like the Full Stack Developer Course in Coimbatore and other Java training programs prepare you for these job requirements.  

Key Points: 

- Pick institutions that offer practical and placement support.  

- Practical skills often matter more than just theoretical knowledge.  

Frequently Asked Questions (FAQs)  

Q1. What are the must-have skills in a Java job description? 

You should have a good understanding of Core Java, OOPs, Spring Framework, and some basic database handling.  

Q2. Is it easy for beginners to get Java jobs?  

Yes, many companies are ready to hire freshers for Entry-level Java roles.

Q3. Does having a Java certification help me get hired?  

Yes, certifications show that you’re serious and have the technical know-how.

 Q4. What’s the average salary for a fresh Java developer in Coimbatore?  

It tends to be between ₹2.5 LPA to ₹4 LPA depending on your skills and certifications.  

Q5. Is project work important for Java job applications?

Yes, mini projects and internships provide the hands-on experience that employers really want.

[impurelight]

How I Made A Dysfunctional Language In The JVM

Part 1: Introduction

I remember when I first considered making my own language. I was googling how to make an abstract static variable in C#. Turns out you can't. Why? Don't know. You just can't. So this was pretty annoying. But what was even more annoying were the programmers that said not only that you couldn't but you also shouldn't.

They gave some flimsy justification about how it broke OOP or something. It was infuriating. On that day I saw the truth. These languages that were the blueprints of modern programming were just as flawed and opinionated as I was. They weren't better, they weren't worse they just were. And on that day I swore I would write my own language. One where I was in charge.

...

But you know, writing a language is hard. And C#... it's not perfect, but it's good enough. So I let my dream sit on the sidelines for several years.

But one day I saw this coding event called Code With Friends. It was one month to code whatever you want. And I was like, "Hey, you know that language you wanted to make since forever ago? Why don't you just make it?" And then I was like, "That sounds like a good idea." So I did. I entered and made a new language called Muse. And here's how I did it.

Part 2: People VS JVM

So to make a language you need to do two things. First you have to transform the code you write into what's called an abstract syntax tree. And then you have to transform that into instructions that the computer can actually understand, in my case JVM bytecode.

Step one is not too hard. I ended up using a program called ANTLR to do it.

ANTLR... let's just say if I had to do this project over I probably wouldn't use ANTLR. It's buggy. I'll be like, "What are you doing? That is obviously an addition operation!" And ANTLR will be like "No, no, no, I see an assignment operation." despite the fact that the code does not look anything like an assignment.

It is frustrating. And to top it all off the debugging tools for ANTLR are almost non-existent. The tool I used was this IntelliJ plugin. It would only tell you the raw output, not how it got there, but it was good enough. Although the plugin did occasionally crash IntelliJ.

So once you have the abstract syntax tree you have to write JVM bytecode. I used this blog post about writing hello world in the JVM to get the structure of a JVM class file. In fact I started my project by just hard coding the code from the post in my program.

So apart from the various metadata such as how many bytes your code is and the header which says 0xCAFEBABE a JVM file has basically 3 parts. The 'constant pool' part, the actual code, and attributes for the code. It's a big of a simplification. If you want to learn more go read the official JVM documentation here and here.

Anyways the constant pool as you might expect holds constant strings. In fact it's basically a grab bag of different constants. But it's most important job is to tell the code which methods/variables each class has and their type.

So then you have the code. If you've worked with assembly code at all you know what to expect here. The only difference is there are no registers, only a stack. So for example to add 1 and 2 together you'd push them both onto the stack and then use the add operation which would pop 1 and 2 and then push 3 onto the stack.

It's pretty neat. I mean, it's not the most efficient thing in the world. There is a command dup and all it does is duplicate the top value on the stack, but it does simplify things a bit.

And now lastly there's the attributes. Most of the attributes are optional. But there is one that is not. That is the Stack Map Table. This one took me forever to figure out. Basically whenever you use a jump instruction (so in an if or a while or a goto (which I really wanted in my language)) you have to use the Stack Map Table to tell Java what should be the current state (in terms of what's on the stack and what variables are defined) at that instruction address.

I mean, there's technically a flag -noverify which makes it so you don't have to have a Stack Map Table, but this pops up a scary warning about the flag being removed in a future version of Java.

So for the longest time I couldn't get the StackMapTable to work. I should probably mention the javap -v FILE_NAME command. This actually prints out the entirety of the JVM class file in a surprisingly readable way.

It was a lot easier than using a hex editor to view the files, that's for sure. In fact the strategy I was using was write a program in Java, compile it, view the JVM class file, and then copy it in my language. And this worked really well.

Until I hit the Stack Map Table. It didn't make any sense how the JVM was generating the values to put in the table. But after sleeping on it I finally got it.

The stack map entries don't hold the actual instruction numbers. They hold the instruction relative to the last instruction subtracted by 1 for whatever reason. So finally I got it working.

So that's it. You can view the project here. It's not fantastic. I mean, it doesn't support basic things like 64 bit ints and orders of operation. But for a month of work I'm pretty proud of it. And it supports things that some other languages don't support. Things like: variables that start with a number (a worryingly high number of languages don't support this), do while (not supported in python), goto statements,

)

unix directory syntax for global variables (like use ../globalVar to access something in global scope, it always bothered me how you can access a global variable identically to a local one and they can have the same name too, that's a bug just waiting to happen), named return types (it always annoyed me to no end when I had a function that returned a bool. What is it returning? If the operation succeeded? Some information about the operation?), and there are no constructors which brings me to...

Part 3: A Dysfunctional Language

This is a class in C#.

And this is a function in C#.

So this is a class.

And a function.

A class with two variables.

A function with two variables.

A class.

A function.

Class.

Function.

Are you getting it? These are not two separate things. This is one thing. And it's called a Dysfunction.

This is one of the epiphanies I had. A class and a function are fundamentally the same thing. We just use different syntax for each and under the hood they're treated a little differently.

So what if I made a language where you define a function the same way you define a class? Well, version 1 of Muse actually did just that. But I was never happy with it. Because you get a class file whether you want it or not and a random function.

So version 2 of Muse I did away with that entirely. No more functions. Only classes. But what if you actually want to use a function. Something like a square root function? Well, we can do that.

Simply instantiate a class (let's call it squareRoot), do some work in the constructor, save that work to a variable (called squareRootValue) and get that variable in the caller (which in Muse can be done on the same line we create the object). Easy.

This is what Dysfunctional Programming is. Will it take off? Well, probably not in the JVM because we have to make new objects on the heap which is much slower than on the stack.

But if I were to port this to something like LLVM and make it so dysfunctions that aren't assigned to a variable are allocated on the stack sure, why not?

Dysfunctional programming could be the next big thing.

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How to Update PHP Version in XAMPP

Many web builders, particularly newcomers, procure a neatly-liked quiz “Find out how to change PHP mannequin in XAMPP?”. After getting a great deal of queries on the subject, we decided to put in writing a transient and simple tutorial on methods to with out issues change PHP mannequin to your localhost.

Desk Of Convey materials:

Find out how to Replace PHP Model in XAMPP in Four Straightforward Steps

Step 1: Earn primarily essentially the most fashionable mannequin of PHP

Step 2: Extract the Zip File and Fabricate PHP Folder

Step 3: Rename the Light PHP Folder

Step 4: Configuring Apache Server

Causes to Replace PHP Model in XAMPP

XAMPP performs a necessary function for web builders and it’s probably the most necessary up-tp-date stacks that builders spend to assemble and check web websites domestically. What makes it neatly-liked amongst builders is that regardless of the reality that one factor goes unhealthy with the code, it doesn’t procure an affect on the live web platform.

Engaged on the localhost is definitely a applicable observe to reinforce your web pattern talents and it is moreover neatly-liked amongst wordpress builders. Nonetheless, most prospects are left asking “Find out how to change PHP mannequin in XAMPP?” Or “Find out how to improve PHP mannequin in XAMPP?”.

Furthermore, proper right here on WPblog:

Find out how to Arrange XAMPP and Arrange wordpress on Localhost (XAMPP).

In case your web construct is prepared, then migrate your construct from localhost to live server.

On this tutorial, I’ll let the technique through which with out issues it is most probably you may perhaps properly presumably change your PHP mannequin in XAMPP by methodology of Four uncomplicated steps. Nonetheless, sooner than embarking on the strategy it is necessary to know why it is required to exchange your PHP mannequin in XAMPP and when is the marvelous time to exchange the PHP mannequin.

Causes to Replace PHP Model in XAMPP

The PHP mannequin requirements most often varies with specs of the mission it is most probably you may perhaps properly presumably very neatly be engaged on. Usually it’s the purchasers who query a newer PHP mannequin which is able to compel you to exchange it. Usually, every time a novel PHP mannequin is rolled out, prospects and builders kill no time in updating their novel variations to carry faraway from safety threats.

As a member of a big assortment of builders’ neighborhood, I most often look many builders nonetheless the spend of the older mannequin of XAMPP(i.e. XAMPP 3.2.1 or older) that runs on PHP 5. What they’re principally all in favour of is updating the PHP mannequin of their novel XAMPP with out reinstalling all of it collectively.

PHP 7 gives an improved predicament of functionalities as when put subsequent with PHP 5, which can be all reason why you may must nonetheless change your PHP mannequin as rapidly as it is launched.  Let’s search at why PHP 7 has the higher give up PHP 5.

For starters, PHP 7 is faster than every other mannequin readily available, together with PHP 5. Bellow, you will procure written a PHP code in PHP 5, at the same time as you occur to inch the an identical code on PHP 7, you will look a necessary improve in efficiency.

PHP 7 gives ease in error dealing with as when put subsequent with different older variations of PHP. If you occur to may properly presumably very neatly be the spend of PHP 5 you then would know the technique powerful it is to handle deadly errors.

PHP 7 helps anonymous class, a function that’s not readily available in any of the older PHP variations. Anonymous class is dilapidated to mosey up the execution time which is neatly-liked in different OOP languages take care of JAVA, C#, and so forth.

PHP 7 helps 64 bit (gigantic) recordsdata which it is most probably you may perhaps properly presumably inch on 64 bit OS structure. This choice is moreover not readily available on PHP 5.

PHP 7 moreover entails null coalescing operators, factual type declarations and a complete lot of improved aspects.

Now that we have understood how necessary it is to exchange your PHP mannequin in XAMPP, let’s scuttle ahead and look methods to change your PHP mannequin in Four uncomplicated steps.

Find out how to Replace PHP Model in XAMPP in Four Straightforward Steps

The not most probably factor regarding the XAMPP lies inside the reality that it’s a pattern server, not a producing server. This technique that it is most probably you may perhaps properly presumably play with its configuration and abolish uncomplicated modifications take care of altering its PHP mannequin with out affecting your live utility.

Reward: I would indicate that sooner than you improve PHP mannequin in XAMPP, abolish a backup to your construct recordsdata or mission recordsdata. ALWAYS MAKE A BACKUP FOR DATA.

Updating PHP mannequin in XAMPP is unassuming. All it is necessary to achieve is be acutely aware these Four uncomplicated steps.

Step 1: Earn primarily essentially the most fashionable mannequin of PHP (i.e. PHP 7.x)

First, it is necessary to click on on proper right here to obtain primarily essentially the most fashionable binary mannequin of PHP. Type particular that you simply obtain the Thread Favorable Zip file relying upon your Home windows mannequin( x86 for 32-bit and x64 for 64-bit ), because it’s most probably you may perhaps properly presumably look inside the describe beneath.

Inside the above describe, it is most probably you may perhaps properly presumably look that I primarily procure downloaded the VC14x64 Thread Favorable on legend of my home home windows mannequin is 64-bit.

Step 2: Extract the Zip File and Fabricate PHP Folder

Subsequent, abolish a novel folder to your Home windows desktop and identify it PHP. Then, extract the Zip file into that novel folder(i.e. PHP) .

Step 3: Rename the Light PHP Folder

Subsequent, scuttle to XAMPP folder and salvage the php folder and rename it with one factor take care of php_5 after which paste the extracted-novel-php folder on XAMPP itemizing. You’ll look inside the beneath describe, how I did this.

Step 4: Configuring Apache Server

Subsequent inside the strategy is to configure the Apache server and for this, it is necessary to start your XAMPP modify panel then click on on on Apache Config > Apache (httpd-xAMPp.conf).

Then, an httpd-xAMPp.config file will start to your disguise. Subsequent, inside the PHP-Module setup, paste the novel traces of code and salvage the earlier traces of code take care of as confirmed inside the beneath describe.

Earlier traces of code:

LoadFile “D:/xAMPp/php/php5ts.dll” LoadFile "D:/xAMPp/php/libpq.dll" LoadModule php5_module “D:/xAMPp/php/php5apache2_4.dll”

  New traces of code:

LoadFile "D:/xAMPp/php/php7ts.dll" LoadFile "D:/xAMPp/php/libpq.dll" LoadModule php7_module "D:/xAMPp/php/php7apache2_4.dll"

Then, maintain the file and restart the XAMPP server. Tada! It’s executed.

Ultimate Phrases

I’m hoping this tutorial helped you to review “Find out how to change PHP mannequin in XAMPP”. If you occur to need any improve and even as you occur to face any inform whereas upgrading the PHP mannequin in XAMPP don’t hesitate to ping me inside the suggestions portion or e mail me at farhan@wpblog.com, I would salvage to allow you to out!

The submit Find out how to Replace PHP Model in XAMPP regarded first on WPblog.

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IT Director- Salesforce

<p>IT Director- Salesforce Support will provide leadership and direction for our salesforce technical support and project team. This role will be highly collaborative developing consumer tools.<br /> <br /> <strong>What you&#39;ll be doing:</strong><br /> &bull; Drive the execution and delivery of Salesforce features by collaborating with many cross functional teams, architects, and product owners<br /> &bull; Manage custom objects, fields, formulas, validation rules, custom workflow, and approval processes<br /> &bull; Lead the strategy, development, and management of operational dashboards, views, and reports in Salesforce custom and standard objects<br /> &bull; Knowledge of best practices in cloud-based ETL/data integration, iPaas, and MDM, this include Force.com lighting connect<br /> &bull; Ensure backup and monitoring systems are in place and functioning at the optimal level, owning technical and the business continuity planning/disaster recovery for all Salesforce solutions are in place<br /> &bull; Leading by example, mentor, coach and lead the Salesforce technology team to deliver exceptional customer experiences and solutions<br /> &bull; Stays abreast of trends and advances in IT solutions. Presents business cases to senior management to win acceptance and secure agreement to proceed.<br /> &bull; Oversee the support of the applications with both Salesforce org&rsquo;s, which includes, not limited to, portals, service cloud, and sales cloud<br /> &bull; Ensure architectural norms and standards are developed and adhered to<br /> &bull; Takes ownership for key initiatives. Coordinates strategies with other members of the salesforce technology team and other knowledgeable resources and develops plans and budgets for implementing the strategies.<br /> &bull; Establish key performance indicators and service level agreements for continually improving the performance and efficiency of the Salesforce Platform<br /> &bull; Establish and maintain a strong collaborative working relationship with leadership and subject matter experts across enterprise to build partnering relationship and to ensure all processes and work interdependencies are identified, and determine the appropriate salesforce solution to support our business needs.<br /> &bull; Drive the selection and manage vendors, maintaining SLAs, negotiating contracts and prices for services our salesforce solutions<br /> &bull; Develops highly effective organization by determining the appropriate staffing consistent with the work load and within enterprise financial parameters.<br /> &bull; Directs the selection and training of staff to meet strategic objectives and guidelines. Promote and execute development plans which strengthen and broaden staff skill sets critical to their current and future job performance. Recognize and promote diversity.<br /> <br /> <strong>What we&#39;re looking for:</strong><br /> &bull; Minimum of 10 years of experience in software product development leadership; Cloud computing preferred<br /> &bull; Experience implementing Salesforce cloud solutions preferred &bull; Experience growing high performing engineering teams<br /> &bull; Experience building large scale distributed, fault-tolerant systems &bull; Prior experience in any of the following languages preferred: Java, C++, C, C#, Ruby, Python<br /> &bull; In-depth understanding of OOP, design patterns, data structures, algorithms, and concurrency<br /> &bull; Experience with Agile Development Methodologies and Test-Driven Development. Agile/Lean certified a plus &bull; Experience using SQL and/or NoSQL datastores e.g. Oracle, Microsoft SQL Server, etc &bull; Strong financial and organizational management experience</p> ITDirector-Salesforce from Job Portal https://www.jobisite.com/extrJobView.htm?id=522974

[jobisitejobs]

Lead Java Developer - Spring/J2EE 5-10 yrs Bangalore Online/Mobile/Web

Must Have Skills:- Java/J2EE, Spring Boot, Java Script, hibernate, Jax-RS, Jax-WS, Data structures, Algorithms and problem solving, Good Analytical amp; Communication SkillDesired Skills:- Java / J2EE, Spring boot, Spring Batch, Mongo DBRequirements:- A highly skilled Java-J2EE developer with good java and db experience is required to work on our regulatory applications.- Experience in developing applications using Java, J2EE technologies.- Experience in OOP design and performance tuning.- Experience with Spring REST: API endpoints based on domain models, Hibernate: Object-Relational Mapping (ORM) framework.- Organized and able to manage a diverse project portfolio- Excellent communication and presentation skills- Ability to work independently and in a teamCTC: 20-30 LPA (ref:hirist.com) LeadJavaDeveloper-SpringJ2EE(5-10yrs)Bangalore(OnlineMobileWeb) from Job Portal https://www.jobisite.com/extrJobView.htm?id=417707

[nullset2]

Don't use null! Null is evil!

Often called the "billion-dollar mistake", the null symbol is a tremendous foe when programming, if mishandled.

The following article shows a definition of nulity, why it's bad, when can it be good, and what options do we have to avoid spending too much time handling nullity in the software we write.

What is nulity?

Without getting too philosophical about it, nulity represents the ability of a programming language to let us express not only the absence of a record or value, but rather the absence of definition behind a symbol. Something that is null is something that doesn't exist, doesn't exist yet, is undefined, or is invalid in some manner.

In other words, nulity in programming is an implicit way to establish nothingness, and by implication, whether the result of an operation or any given memory state is valid or not.

If something is null, we assert, such a something doesn't exist, or is not even defined to begin with, or is the result of an operation that has failed.

Do not conflate nulity with emptiness. Note, for example in a Java context, null is different from symbols like 0 or "", a String literal representing an object that has no character information associated to it, even though they may seem the same to the naive or the newbie.

It's a good thing that we have null, in a way, because the concept of nulity is natural to life. Think of the TP that you put next to your toilet.

Having an empty roll present is not the same than having no roll at all, because you can assess that a roll is empty if the cardboard tube is there, but you cannot make such an assessment on the length of the toilet paper remaining if there's no roll to begin with!

Keep this in mind: if you try to access information on something that's not existent, then you have a problem.

And why is this a problem in software? Because it gives us an easy way to shoot ourselves in the foot at every step of the million thousand step road we traverse.

Why is nulity bad?

The problem with including a symbol to represent nulity in programming languages is that it takes extra intellectual effort to decode its meaning in your code.

null is also global state, and keeping global state in your systems, unless you have a tremendously good reason to do so is usually a huge red flag that you need to redesign.

Since the meaning of a null isn't tacit and explicit, nor typed, when you use null in your programs, then other programmers have to take additional time and care to read through your code and understand the implications of nulity and mitigate them when working with your code. These can be a dime a dozen, dependent on context on one of the thousands of different parts of their systems.

Why is this noisy? Why is this bad? Why do I hate it? Well, NullPointerExceptions are the bread and butter of debugging. All of us have run into stupid, unexplainable, I-have-no-idea-why-this-is-happening NullPointerExceptions when coding. All of us have seen a web application error out with NullPointerException on the browser. So, null enables shitty code craftsmanship because some times it's easy to forget when a variable can be null. Simple as that. It makes for software that doesn't fail gracefully and that isn't resillient. Hundreds of additional engineering hours have to be poured into software to make it null-safe.

This isn't good form. We can make the programmer's job easier so they can focus on creating well-thought-out software that's a joy to use rather than having them write if(str == null || str.length() == 0) for the umpteenth time. We should develop services that don't ping us at 5 AM on Saturday because of an NPE provoked by a transient outage on a database server. We can do better.

How do different languages use nulity?

Let's make a brief pause to explore how different programming languages allow us to use different representations of nulity:

Traditional ANSI C has a macro NULL, referencing the type void *. Hence, there's no null in the same sense that more modern languages use, which makes it even less memory-safe (lol). The interpretation that we can give to this macro is that it's related to the concept of a null pointer, which is a pointer that points to nothing in memory (void*), thus, conveying the meaning that the pointer points to an invalid value, that is, points to nothing. An area undefined in memory in brute.

Memory-safe C-likes like Java have a standard null symbol, usually as a reserved word by itself. As we said, Java has null, Ruby has nil and Python has the singleton object None. PHP has the constant NULL. C# also has null. Most JVM-derived languages include the traditional java null in its syntax.

Javascript, funnily enough, has two forms of null: null and undefined. undefined means that a variable hasn't been assigned a value to, yet, but has been declared, and null is an assignment value that indicates nulity. Marvelous!

Scala, presents many different incarnations of it: Null, which is a Scala trait which can be applied to functions or objects, null which is a translation of the Java null, Nil, which is a zero-length list, Nothing, which is a trait, and None, which is a subclass of the Option type, together with the Some type (more on that in a moment) and can be used as a return value and explicitly helps deal with undefined symbols avoiding null-pointer exceptions. None is what is most commonly seen in Scala software.

Go nils are similar to C null-pointers. Idiomatically, they are actually Interfaces meant to be used as the zero-value of a struct, or value otherwise. That is, nil in Go doesn't work like null in other languages in the sense that it doesn't imply invalidity but rather only means uninitialization. In Go you cannot assign values to nil, but rather you can assign pointers and interfaces to nil. Thus, a bit more ceremony is necessary when making null-checks in Go since a simple value == nil will not suffice.

As we'll see in a few moments, Scala provides one of the very best ways to elegantly achieve null-safety, which is the Option type, and which allows one to elegantly and expressively enforce null-safety through the type system itself. Most programming languages have third-party implementations of the Option type, or in the case of Java since Java 8, built-in into the language as the Optional type.

How to avoid common null-related pitfalls

The first strategy, of course, is conscientiousness! Be conscious of your code! Think! Be aware! On OOP languages, before you access any member of anything that could be null, make a null-check!

Person alice = personManager.getPersonByName("Alice"); //uh-oh! this can be null! Month monthOfBirth = Month.of(alice.getBirthday().getMonth()); String result = "Woo! Alice was born in " + monthOfBirth.name(); System.out.println(result);

Consider the following:

What if alice is never found? alice is then null, so what will happen when you try alice.getBirthday()?

What if alice has no birthday information associated to her on the database yet? alice is not null, but maybe you'd like to set up a "safe default" to display in such a case.

What if alice entered a Year of birth but for some reason there's no result from the database for getMonth() in runtime? What happens when you try to invoke monthOfBirth.name()? Shit hits the fan.

You're coding exclusively against the happy-path. This is terrible programming practice. So, simply, evaluate against all of those scenarios defensively:

String result; Person alice = personManager.getPersonByName("Alice"); if(alice != null && alice.getBirthday() != null){ Month monthOfBirth = Month.of(alice.getBirthday().getMonth()); String monthOfBirthName; if(monthOfBirth != null) monthOfBirthName = monthOfBirth.name(); else monthOfBirthName = "an unknown month!"; result = "Woo! Alice was born in " + monthOfBirthName; System.out.println(result); }

Presto, no more NullPointerException!

(Yes, I am aware that both Date and Month are deprecated in modern Java. Bear with me, this is only an example to exemplify how to deal with null)

So basically, be aware: - If null is a reasonable input parameter for your method, fix the method to account for it. - If null is unacceptable, fix the caller instead. What does "reasonable" mean here? You decide.

(NOTE: Here, we are also leveraging the fact that the java operator && is short-circuiting. In some other languages it works differently but on languages similar to java, logical AND operations are evaluated left-to-right, and upon first failure of the logical check by finding a false, the program gives up and stops evaluating the statement.)

But this is too noisy and too bulky! People may even want to write more to evaluate against different members of the alice object. Yuck!. What options do we have?

Null-safe navigation and null-coalescing

Well, the second strategy is that we can use a language that has features for safe navigation (also called null-conditional), and null-coalescing. Let's think of the Groovy language now.

In groovy, the idea of safe-navigation is the ability to access members on an object without triggering NPE's. This syntactic sugar is baked right into the language through the use of the ?. operator. C# also has the ?. operator and Ruby, as of 2.3, has the &. operator, which does the same. This will gracefully handle failure in case one of the dependencies of your object is null by returning null the very moment you try to access a member on null, so you can stop worrying so much about handling null checks.

In groovy there's also null-coalescing with the ?: operator, funnily called the "Elvis" operator (because if you look at it sideways it looks like Elvis' hair and eyes), which takes two expressions and will immediately default to the right hand expresion if the expression on the left is null or false.

The previous blob of java code becomes, thus:

def alice = personManager.getPersonByName("Alice") def monthOfBirthName = Month.of(alice?.getBirthday()?.getMonth())?.name() ?: "an unknown month!" String result = "Woo! Alice was born in " + monthOfBirthName println(result)

Doesn't that feel a lot better? It does for me.

Scala Option and Java 8 Optional

Finally, the last option is to leverage a language's type system to expressively state that a value can be null and whatever rules you want to set around it to handle what will your program do when the value is valid and existing or the contrary.

Scala has one of the best implementations of this in the Option type, documented in depth here. Basically we're letting the compiler know that, in runtime, an object may not be defined. Used in tandem with other constructs in this language you can come up with very expressive ways to handle values that can possibly be null. Following the same example, take a look at this highly idiomatic example with FP:

val alice : Option[Person] = personManager getPersonByName "Alice" //let's assume this returns a None val monthOfBirthName: Option[String] = alice map { _.getBirthday } map { b => Month.of(b.getMonth) } map { _.name } println("Woo! Alice was born in " + (monthOfBirthName getOrElse "an unknown month!"))

Here, the Option type gives us the getOrElse method which is used to provide a safe default whenever we try to inspect that object.

Here's the kicker: when you have an Option object which really is defined, you get a Some value, else, it's None. If you try to map Some value, then the result will be Some, but if you try to map a None, the result will also be None and getOrElse will just fall back to the safe default!

Using Option types liberally is universally preferred against null usage in Scala. You should never, ever return or handle nulls in scala. You should always return an Option whenever possible and let the handler "unwrap" the objects to their convenience.

So, in good Java tradition, 7 years later, probably after discussing mutexes and locks for too long, the Java language finally caught up to Scala and added the Optional type together with all the sweet Functional Programming sauce they've been adding to java and it makes our job easier. Now, being exclusively Java-8 idiomatic:

Optional<person> alice = Optional.ofNullable(personManager.getPersonByName("Alice")); String result = "Woo! Alice was born in " + alice.map(Person::getBirthday).map(Date::getMonth) .map(Month::of) .map(Month::name) .orElse("an unknown month!"); System.out.println(result);

Which is still quite verbose but not as quite as we started with, not to mention that it plays Fantastically with streams. Cool, right?

Conclusion

We have now seen the most modern alternatives in three different languages to handle nulity and you should be at least superficially acquainted with the implications of its use.

What do you think?

Please keep in mind this when writing your next piece of software and if you have any additions to contribute or anything that you'd like to discuss about this or other subjects in programming, please toss me a line and I'll get in touch with you.

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Assignment Operators

Java Tutorial

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App Developers (Android & iOS) job at Yoodo Malaysia

Yoodo, Malaysia’s newest mobile brand, was launched as the country’s first truly customisable digital mobile service. Built on the premise that the customer knows best, Yoodo brings to market a new and comprehensive mobile offering that gives customers the ultimate choice and control over their plans while delivering simple, clear and engaging customer service.

Analysis, specification, and validation of requirements for mobile applications/projects

Documenting and diagramming technical design and their interactions with external systems

Testing usability, scalability, performance, compatibility, and reliability of software

Providing maintenance and 3rd level support for all Mob Apps developed indefinitely

Logging and tracking bugs, issues, complaints and feature requests using enterprise standard tracking tools

Developing and managing monitoring tools to provide accurate feedback and real time reporting for all Mob Apps

Developing and managing analytics reporting for all mobile applications/products

Participation in periodic team code review sessions with the team

Estimate level of effort, evaluate new options of similar technology, and offer suggestions to improve processes

Providing interim software solutions to solve problems that enable business units to continue operating during unforeseen crises

Experience with React Native framework for building hybrid mobile apps

Experience with integration with backend RESTful APIs

Experience with Objective-C and Swift (iOS) and/or Java (Android) a plus

Utilize Apple software development tools such as XCode and Instruments to develop, test, debug, and deploy quality software

Utilize Android software development tools such as Android Developer and Android Studio to develop, test, debug, and deploy quality software

Solid OOP and software design knowledge and able to create software that is extensible, reusable and meets desired architectural objectives

Familiarity with software development life cycle, agile methodology including Scrum

University degree in Computer Science, Computer Engineering, or other technical discipline

3+ years experience in mobile application development

From http://www.startupjobs.asia/job/36394-app-developers-android-amp-ios-it-job-at-yoodo-malaysia

from https://startupjobsasiablog.wordpress.com/2018/02/06/app-developers-android-ios-job-at-yoodo-malaysia/

[startupjobsasia]

App Developers (Android & iOS) job at Yoodo Malaysia

Yoodo, Malaysia’s newest mobile brand, was launched as the country’s first truly customisable digital mobile service. Built on the premise that the customer knows best, Yoodo brings to market a new and comprehensive mobile offering that gives customers the ultimate choice and control over their plans while delivering simple, clear and engaging customer service.

Analysis, specification, and validation of requirements for mobile applications/projects

Documenting and diagramming technical design and their interactions with external systems

Testing usability, scalability, performance, compatibility, and reliability of software

Providing maintenance and 3rd level support for all Mob Apps developed indefinitely

Logging and tracking bugs, issues, complaints and feature requests using enterprise standard tracking tools

Developing and managing monitoring tools to provide accurate feedback and real time reporting for all Mob Apps

Developing and managing analytics reporting for all mobile applications/products

Participation in periodic team code review sessions with the team

Estimate level of effort, evaluate new options of similar technology, and offer suggestions to improve processes

Providing interim software solutions to solve problems that enable business units to continue operating during unforeseen crises

Experience with React Native framework for building hybrid mobile apps

Experience with integration with backend RESTful APIs

Experience with Objective-C and Swift (iOS) and/or Java (Android) a plus

Utilize Apple software development tools such as XCode and Instruments to develop, test, debug, and deploy quality software

Utilize Android software development tools such as Android Developer and Android Studio to develop, test, debug, and deploy quality software

Solid OOP and software design knowledge and able to create software that is extensible, reusable and meets desired architectural objectives

Familiarity with software development life cycle, agile methodology including Scrum

University degree in Computer Science, Computer Engineering, or other technical discipline

3+ years experience in mobile application development

StartUp Jobs Asia - Startup Jobs in Singapore , Malaysia , HongKong ,Thailand from http://www.startupjobs.asia/job/36394-app-developers-android-amp-ios-it-job-at-yoodo-malaysia

[jobisite11]

Training & Hiring For Data Scientists, Data Analysts, Data - Plainsboro, NJ

Ad Id: 1005611 Posted by Shiraaz in Plainsboro Hello, We are looking for enthusiastic, dynamic people who has a zeal to learn New Technologies and be a part of our excellent IT Services team. We are an IT Consulting firm having 20+ years of experience in the Industry, we are currently hiring Data Scientists, Data Analysts, Data Modelers, Big Data Hadoop Consultants & Java Developers for our various clients all across the USA. We offer training, placement & On-job support to Graduates, Experience Consultants based upon their skills set and expertise. We prefer candidates locals to NJ/NY/PA so that we can accomodate in our Guest House OR anyone who can relocate to NJ during the training & placement process. We provide food & accomodation. We have offices in NY/NJ/OH/IL along with the Guest House.   Training provided on the below technologies with live projects: Data Scientists Data Analysts Data Modelers Big Data Hadoop Consultants  OOPS/ Embedded Programming R - Machine Learning PHP, Python Unix/Linux/AIX DevOps AWS / Cloud Computing We have a dedicated and expert team of trainers with loads of industry experience to help individuals achieve their dream job in IT Industry. Interested candidates can mail the resume along with contact details at career OR call at 732-668-0447 Thanks Mark Superlogix Inc IT Software / Services  |  Jobs in Plainsboro, NJ Skills: AI Machine Learning, Amazon Web Services Foundation, Big Data, Cloudera Spark, Computer Science, Data Modeling , Data Science, Github, Hadoop, Java Training&HiringForDataScientists,DataAnalysts,Data-Plainsboro,NJ from Job Portal http://www.jobisite.com/extrJobView.htm?id=79935

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Latest Unity jobs in Singapore, Singapore posted on Thursday 27th of April 2017

Latest Unity jobs in Singapore, Singapore posted on Thursday 27th of April 2017

Latest Unity jobs in Singapore, Singapore posted on Thursday 27th of April 2017 This job listing contains a total of 4 jobs.

Software Engineer – 3D Unity (Ang Mo Kio / Perm) Job Excerpt

3D Unity, C#, JAVA & Object-Oriented Programming (OOP). Part of a dynamic team to provide software solution for learning applications…. Continue Reading…

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OOPS NOTES

OOPS NOTES

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Ds Notes

DS