JAVA – Just Another Virtual Architecture

Java is one of the most popular programming languages. Old name for java is OAK. It is one of the object oriented programming language. Lot of open source application are developed using java.

Java is platform independent language. Java program stored with .java extension(source code). Java compiler compiles source code and converts into class file. Class file load and execute using java interpreter. Java compiler is machine independent. Java interpreter is machine dependent (JRE).

Write a simple hello world program in java

public class HelloWorld{

          public static void main(String arg[]){

                   System.out.println(“HelloWorld”);

}

}

Step for compile and execute the java file

1.     Save the code as a HelloWorld.java

2.     Compile. cmd>Javac HelloWorld.java

3.     Run. cmd>Java HelloWorld

Note: After compile, you get HelloWorld.class file where you stored in the HelloWorld.java location. This class is machine independent you can copy and paste into some other machine and try to run.