--------------------------------- interface A_IF.java
 
public interface A_IF {
   void methodA ();		
}
	

--------------------------------- class A.java

public class A implements A_IF {
   @Override
   public void methodA() {
      System.out.println("A dummy implementation of methodA()");		
   }	
}
--------------------------------- Main.java 
public class Main {
   public static void main(String[] args) {	
    // Quiz statement 
   }
   static void myMethod(A_IF a){
      a.methodA();
   }
}
	

Which are (correct) uses of an anonymous class in Main.java, method main() (after "Quiz statement")?

1) 
A_IF a = new A();
2)
A_IF a = new A_IF () { };
	
3) 
myMethod(new A_IF() {
   @Override
   public void methodA() {
      System.out.println("A dummy implementation for methodA()");
   }	
});
		
4)
A_IF a = new A_IF () {
   @Override
   public int methodA() {
      System.out.println("A dummy implementation for methodA()");
      return 0;	
} };