java 内部类实现多重继承

bstract 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());
}
}