Which methods ConcreteClass needs too implements???

Question

public interface Interface_X{
public int methodX(int x);
}
public interface Interface_Y extends Interface_X{
public void methodY(String z);
public int methodX(int y);
}
public interface Interface_Z extends Interface_X{
public void methodX(String x);
public int methodX(int y);
}
public abstract class AbstractClass implements Interface_Z, Runnable {
public abstract int methodX():
public int methodX(int c){}
}
public class ConcreteClass extends AbstractClass{
// which methods ConcreteClass needs too implements

}

Answer 1

Not sure but these look some of them-

public int methodX(){}
public void methodX(String x){}
public void run(){}

Answer 2

Yes.
All the methods need to be implemented which are available to immediate super class as abstract methods..

Answer 3

+ in AbstractClass
it needs return
public int methodX(int c){}
and semicolon instead colon