三种方法实现灯亮

小咪咪 2021-12-14 06:37 179阅读 0赞

## 台灯开启不同颜色的灯亮 ##

1、抽象类

package LESSON5;
    //用抽象类  台灯类
    class Lamp{
        private Buble buble;//类型为Buble的buble变量
        public Buble getBuble() {
            return buble;
        }
        public void setBuble(Buble buble) {
            this.buble = buble;
        }
        public void on(){
            buble.shine();        
        };
    }
    abstract class Buble {    
        public abstract void shine();
    }
    class RedBuble extends Buble{
        @Override
        public void shine() {
            System.out.println("red");        
        }    
    }
    class GreenBuble extends Buble{
        @Override
        public void shine() {
            System.out.println("green");        
        }    
    }
    public class Exercise4 {
        public static void main(String[] args) {
            RedBuble re=new RedBuble();
            GreenBuble gr=new GreenBuble();
            Lamp la=new Lamp();
            la.setBuble(re);//红灯
            la.on();//输出red      
        }
    }

2、接口无get,set方法

package LESSON7;
    class Lamp{
        private Buble buble;//类型为Buble的buble变量    
        public void on(Buble buble){
            buble.shine();        
        };
    }
    interface Buble {
        //抽象方法
        public void shine();
    }
    class RedBuble implements Buble{
        @Override
        public void shine() {
            System.out.println("red");        
        }    
    }
    class GreenBuble implements Buble{
        @Override
        public void shine() {
            System.out.println("green");        
        }    
    }
    public class Exercise3 {
        public static void main(String[] args) {
            RedBuble re =new RedBuble ();
            GreenBuble gr=new GreenBuble();
            Lamp la=new Lamp();
            la.on(re);
        }
    }

3、接口有get,set方法

package LESSON6;
    class Lamp{
        private Buble buble;//类型为Buble的buble变量
        //或者不用设置属性和get，set方法直接将Buble buble当函数参数传给on(),调用时直接传入
        public Buble getBuble() {
            return buble;
        }
        public void setBuble(Buble buble) {
            this.buble = buble;
        }
        public void on(){
        //(法2)public void on(Buble buble)
            buble.shine();        
        };
    }
    interface Buble {    
        public void shine();
    }
    class RedBuble implements Buble{
        @Override
        public void shine() {
            System.out.println("red");        
        }        
    }
    class GreenBuble implements Buble{
        @Override
        public void shine() {
            System.out.println("green");        
        }    
    }
    public class Exercise1 {   
        public static void main(String[] args) {
            RedBuble rb=new RedBuble();
            GreenBuble gb=new GreenBuble();        
            Lamp la=new Lamp();
    //        la.on(rb);（法2）传入
            la.setBuble(rb);
            la.on();                
        }
    }

转载于:https://www.cnblogs.com/qfdy123/p/10952346.html