Interface implementation problem

[Kumar Sushil]

I found this Q. in mock Exam

interface TestA {
String toString();
}

public class Test implements TestA{
public static void main(String[] args){
System.out.println("hello");
}
}

If, we implement an interface, this is necessary that we implement methods of that interface. But here this not happening. Is this due to toString() method of Object class?

[marc weber]

Originally posted by johny martin:
...Is this due to toString() method of Object class?

Yes, the implementation is inherited from Object.

interface TestA {
  String toString();
}
 
public class TestImplementation implements TestA {
  public static void main(String[] args){
    TestA myTestA = new TestImplementation();
    System.out.println(myTestA.toString());
  }
}