java内部类

java内部类实现了多继承

 

abstract class A {
    abstract void methodA();
}
 
abstract class B {
    abstract void methodB();
}
 
class C extends A {
    @Override
    void methodA() {
       System. out .println( "extends A's method" );
    }
 
    B getB() {
       return new B() {
           @Override
           void methodB() {
              System. out .println( "extends B's method" );
           }
       };
    }
}
 
public class MultiImplementation {
    public void doA(A a) {
       a.methodA();
    }
 
    public void doB(B b) {
       b.methodB();
    }
 
    public static void main(String[] args) {
       MultiImplementation mi = new MultiImplementation();
       C c = new C();
       mi.doA(c);
       mi.doB(c.getB());
    }

}

 

结果:
extends A's method
extends B's method

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