Two ways that a class can implement multiple interfaces

// : c08:MultiInterfaces.java
// Two ways that a class can implement multiple interfaces.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

interface A {
}

interface B {
}

class X implements A, B {
}

class Y implements A {
  B makeB() {
    // Anonymous inner class:
    return new B() {
    };
  }
}

public class MultiInterfaces {
  static void takesA(A a) {
  }

  static void takesB(B b) {
  }

  public static void main(String[] args) {
    X x = new X();
    Y y = new Y();
    takesA(x);
    takesA(y);
    takesB(x);
    takesB(y.makeB());
  }
} ///:~

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Two ways that a class can implement multiple interfaces : Interface and Abstract Class « Language Basics « Java

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