Explain ways to run a java class

1) Create a public static void main(String args[]) {……} in your class and run this java class to run the code inside the main block


2) The second way is to create a static block inside a class static {……} and run the java file. The code inside the static block will get executed.

public class RunJavaMain {

    public static void main(String args[]) {
        System.out.println("Main method is called");
    }
}
public class RunJavaStatic {

    static {
        System.out.println("This file is executed using main method");
        System.exit(0);
    }
}

The System.exit(0) lets the program exit before the JVM is looking for the main method, otherwise the following error will be thrown:
Exception in thread "main" java.lang.NoSuchMethodError: main

As of Java 7, it stop working. It compiles fine but while execution it gives the error message