Question

I know that main() can be overloaded in a class with the compiler always taking the one with String[] args as arguments as the main method from where the execution starts. But is it possible to declare the same

main(String args[]) in an interface and implement it in different classes differently?

For example,

package test;
interface test
{
    public void main(String args[]);
    public void display();
}



package test;
class Testclass1 implements test
{
   public void display()
   {
       System.out.println("hello");
    }
   public static void main(String[] args)
   {
       test t;
       t.display();
    }
}


package temp;
import test.*;
abstract class Testclass2 implements test
{
   public static void main(String args[])
   {
       System.out.println("TESTING");
    }
}

Answer 1

No you cannot, because main has to be static in order to be used as an entry point, and Interfaces dont allow the use of static, until Java 7.

Yes you can run a psvm in an interface, if you’re working in Java 8. Because static methods are allowed in an interface starting from Java 8.

But of course, you cannot override the main method, since psvm is a static method.