内部类实现多重继承

内部类实现多重继承:
interface Machine
{
void run();
}

class Person
{
void run()
{
System.out.println("run");
}
}

class Robot extends Person
{
private class MachineHeart implements Machine
{
public void run()
{
System.out.println("heart run");
}
}
Machine getMachine()
{
return new MachineHeart();
}
}

class Test
{
public static void main(String[] args)
{
Robot robot=new Robot();
Machine m=robot.getMachine();
m.run();
robot.run();
}
}