Hello World in Java Programming Language

Algorithm


Print Hello World String. Just use print function of java.

Code Examples

#1 Simple Hello World Print in Java Language

Code - Java Programming

class Hello {
    public static void main(String[] args) {
        System.out.println("Hello World !");
    }
}
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Output

x
+
cmd
Hello World !

Demonstration


Let's discuss about the code first, how this Hello World works.

 

In this line,

class Hello {

We created a class named Hello, It's just a user defined class which name is Hello. We can name it anything rather than Hello. We can name it like HelloWorld also, if we want.

 

Next, 

public static void main(String[] args) {

In this line, we've defined the main method. All java programm should contain this main method. Without this, java programm will not enter into. and here is fixed. We can't use any other name rather than main. 

And, we assume you know - How Java compiler Works. When java compiler find this method, it starts to execute the code.

And String[] args, we passed empty array of string as argument in this method. Let's learn more about argument, parameter later in another chapter.

 

Next & Final - The main function of the method to print the Hello World.

System.out.println("Hello World !");

This line print Hello World ! string to the compiler.