Java Hello World program

Codeaft.java

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

Output

codeaft@codeaft:~$ javac Codeaft.java
codeaft@codeaft:~$ java Codeaft
Hello, World!
codeaft@codeaft:~$

Java program without using main function (only compilation)

Codeaft.java

class Codeaft
{
    static 
    {
        System.out.println("Hello World");
    }
}

Output

codeaft@codeaft:~$ javac Codeaft.java
codeaft@codeaft:~$ java Codeaft
Error: Main method not found in class Codeaft, please define the main method as:
   public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
codeaft@codeaft:~$

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Codeaft

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