Programming Languages

For a Java developer, having a strong understanding of Object-Oriented Programming is a must.
Master the core APIs- It doesn't matter how strong you are in terms of theoretical knowledge if you don't know the language constructs and core APIs.
Keep coding- Things look simpler when talking about them theoretically. We can give a solution to a problem very easy in theory. But we can realize the depth of the problem when we start implementing our approach. You will come to know the language limitations, or design best practices while coding. So keep coding.
Subscribe to forums -When starting to work on a new technology the best and first thing to do is subscribe to the relevant technology forums. Whatever the issue you are facing, someone else in the world might have already faced it earlier and might have found the solution. And it would be really really great if you can answer the questions asked by other forum users.
Read open source frameworks source code- A good developer will learn how to use a framework. But if you want to be an outstanding developer you should study the source code of various successful, popular frameworks where you can see the internal working mechanism of the framework and lot of best practices. It will help a lot in using the frameworks in a very effective way.
Know the technology trends- In the open source software development technology trends keep on changing.
Know different development methodologies- Nowadays choosing the development methodology depends on the client. Some clients prefer Agile and some clients are happy with waterfall model. So having an idea of various methodologies would be great.
J2EE would be a better choice as its an extended version. So, definitely opt for that.

Some questions for JAVA developers -
Which is the superclass of all classes?
Differentiate between J2SDK 1.5 and J2SDK 5.0?
What are wrapper classes?
What is the ThreadLocal class? How and why would you use it?
What is the volatile keyword? How and why would you use it?
What is runtime polymorphism or dynamic method dispatch?
What is the number of bits used to represent ASCII, Unicode, the UTF-16, and the UTF-8 characters?
Is it possible to import same package or class twice? Will the JVM load the package twice at runtime?
What is the difference between System.out, System.err, and System.in?
What is the Java Classloader? List and explain the purpose of the three types of class loaders?
What are the differences between Heap and Stack Memory?
What are the differences between Get and Post methods?
How do cookies work in Servlets?

Perl is a programming language developed by Larry Wall, specially designed for text processing. It stands for Practical Extraction and Report Language. It runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial provides a complete understanding of Perl. Prior knowledge of C/C++ or UNIX shell programming is preferred for Perl programming. Courses for Perl developers may include computer systems, algorithms, data structures, machine architecture, software engineering, linear algebra, and discrete math. Because Perl is a dynamic programming language that differs fundamentally from languages such as C/C++ and Java. There are many online courses available for Perl on Udemy, Lynda, Coursera etc. Check the below link for institutes offering Perl courses - https://www.shiksha.com/it-software/colleges/perl-colleges-india