变量调用分析——这个ball到底是那个ball?

public class Ball implements Rollable{

public static void main(String[] args) {

Ball ball = new Ball("lanqiu");

System.out.println(ball.getName());//这里程序为何不报错？如何区分新实例ball和接口中的ball

ball.play();

Rollable.ball.play();

}

private String name;

public String getName(){

return name;

}

public Ball(String name){

this.name = name;

}

@Override
public void play() {

// ball = new Ball("Football");

System.out.println(ball.getName());

}

}

interface Playable{

void play();

}

interface Bounceable{

void play();

}

interface Rollable extends Playable,Bounceable{

Ball ball = new Ball("PingPang");

}