SIMPLE JAVA PROGRAM

Class Example

{

public static void main(String args[])

{

System.out.println(“Welcome to Java”);

}

}

Save this file as Example.java same as class name

Class Example

It defines a class named Example using a keyword class. After that, class definition is

specified within curly braces.

public static void main(String args[])

This is the point from where the program will start the execution. The public keyword

is used to control the access of various class members. If member is public it can be accessed

outside the class. So we have to declare main( ) as public because it has to be invoked by the

code outside the class when program is executed. Static keyword allows the main( ) method

to be executed without creating an object of that class, and void means main( ) method does

not return any value.

String args[]

String is a predefined class and it takes any type of variable. [ ] represents free array.

args represents reference variable of string type.

System.out.println(“Welcome to Java”);

System is a class from java.lang package that contains all I/O related reference variables. Out

is a variable of system class. println( ) function is used to display this line.

Running the program

First set the path

location

C:\ set path=c:\jdk 1.3\bin;%path%

Compile the program

C:\> javac Example.java

The javac compiler creates a file called Example.class that contains the bytecode version of

the program.

Run the Program

C:\> java Example

Output: Welcome to java