Hello World Java Program

Hello World Java Program

We are just getting started.Today we are going to write our fist java program that will print hello world.

Writing first java program

[

public class Hello {

    /**     * @param args the command line arguments     */    

public static void main(String[] args) {
        // TODO code application logic here
        System.out.println("Hello World");
    }

}

]

Above program code will print Hello world string.

Lets look at a few keywords from this program.

public-this is access modifier.public keyword means that the class,variable or a method can be accessed anywhere in the program and in other packages.

static -means the variable or method is shared in all class instances.For example if you define a variable static int num=10; if num is increase in one method,the change will be reflected in all instances that are using the same num.

void-this means the method has no return type.A method can return interger,array etc.

String [] args-these are console arguments that are passed as array.

System.out.println-this method outputs results to the screen.

System.in =gets data enter by user and uses it in execution.