Java Tutorials – Learn Java for free [Best resource]

JAVA programming language: Java is a high-level, class-based,  Object-oriented general-purpose programming language. Java was originally developed by James Gosling at Sun Microsystems. It was released in May 1995 as a core component of Sun Microsystems’ Java platform. Java is fast, reliable, and secure. Java programs are more structured than C++, all functions and statements in java must reside within a class while C++ it allows function definitions and statements outside of classes. The Java programming language is a statically typed language, which means that every variable and every expression has a type that is known at compile time. Java is an open standard and publicly source code. According to Sun, till 2017:

  • Java is ranked the #1 programming language.
  • 12 million developers run Java worldwide.
  • There are 38 billion active Java Virtual Machines (JVMs).

There are many devices where Java is currently used. Some of them are as follows:

  • Web Applications such as,, etc.
  • Desktop Applications such as acrobat reader, media player, antivirus, etc.
  • Enterprise Applications such as banking applications.
  • Mobile
  • Robotics
  • Games, etc.

Why Java?

Java has many advantages over other languages, one of the key features of java is that it is platform independent i.e write one and run anywhere language.  It supports platform independence by using Java byte-code and Java Virtual Machine. Java compiler javac converts the program code into byte code, this byte code is platform-independent and can be run on any operating system’s JVM. JVM interprets the byte code to machine code and the program is executed.  Some other advantages of java are: 

  • Simple: It is easy to learn and understand. Straightforward and easy to comprehend codes.
  • Secure: Languages like C and C++ use pointers, which allow access to memory location. This is a security risk, as pointers can lead to unauthorized memory access. Java also used OOPs concepts like encapsulation, abstraction, and inheritance, which increases security and prevents unauthorized access to users.
  • High-Level Programming language: Java programs are written in a high-level language, i.e, human language. It is similar to English, with a few syntaxes that are simple and easy to remember.
  • Automatic Garbage collection: In java, JVM automatically manages all the operations of garbage removal and makes the language fast.
  • Multithreading: For better performance and maximum CPU utilization multithreading is necessary which is a key feature of java. We can run more than one thread at a time in java to increase performance and efficiency.

This tutorial covers everything about Java from basic to advanced: