Please take a look at the beginner's question, thank you for answering, I will remember

hewei0611

Has a base class class T {
 void sleep () {System.out.println ("aaa");}
}
Has an interface interface I {

}
There is a class class Test extends T
{
  void sleep () () /// Override the sleep method of the base class
}

What I want to do now is that if Test wants to override the sleep method of the base class, then I must implement the I interface. If I do n’t implement it, I will report an error. interface

sunjingyao

What does it have to do with the I interface?

zzzdsd

interface I {
    public void mustImpl ();
}

abstract class AbstractTest extends T implements i {
      
}

class test extends AbstractTest {
   // do something

}

ank11111

Why has to be this way? If so, what are the goals? Strange.

liuweiming

I do not quite understand you!

37755500

class Test extends T
{
  void sleep () {
    if ((this instanceOf I) == false) {
         throw new RuntimeException ("must implement I");
    }


}
Don't know if you mean it


}

kissinger328

class T interface I {
 void sleep () {System.out.println ("aaa");}
}
interface I {

}
class Test extends T
{
  void sleep () {}
}

火龙羽

Subclasses inherit parent classes and interfaces

幕后黑手

shen me dongdong a?

asdssasd

Don't understand what it means?
public class Test extends T {
    void sleep () {}
    public static void main (String [] args) {
        new Test (). sleep ();
    }
}

class T {
 void sleep () {System.out.println ("aaa");}
}
interface I {
}
No results are printed, rewriting is ok