public class Test {

public static void main(String[] args) {

// TODO Auto-generated method stub

Balloon balloon=new Balloon();

Bird bird=new Bird();

Plane plane=new Plane();

plane.fly();

bird.fly();

balloon.fly();

}

}

public class Balloon implements IFly{

public void fly() {

System.out.println("气球飞上天空");

}

}

public class Bird implements IFly{

public void fly() {

System.out.println("小鸟在天空翱翔");

}

}

public class Plane implements IFly{

public void fly() {

System.out.println("飞机在天上飞");

}

}

public interface IFly {

public void fly();

}