Printing hello without using main method:

We can use static block to print something without using main method as static block executes as soon as the class is loaded. To ignore exception "System.exit(0);"  is used which terminates the program at the end of the  block .

class WithoutMain
{
    static
    {
        System.out.println("java program  without main method");
        System.exit(0);
         
    }
}

Output:

java program  without main method

If we will not exit the above program with System.exit(0); then it will give "main method not found" exception.

But it was possible only upto Java6 , it will not work in Java7 and above version . JDK7 and above version will give following error:

Error: Main method not found in class WithoutMain, please define the main method as:
public static void main(String[] args)