JAVA 入门 28 多态综合案例 内部类

 

 USB 接口

package com.ITheima._polymorphic_test;


public interface USB {
    void connect();
    void unconnect();
}

KeyBoard键盘类

package com.ITheima._polymorphic_test;

public class KeyBoard implements USB{

    private  String name;

    //无参构造器
    public KeyBoard() {
    }

    //有参构造器
    public KeyBoard(String name) {
        this.name = name;
    }

    //独有功能
    public void keyDown(){
        System.out.println("键盘按下");
    }


    @Override
    public void connect(){
        System.out.println(this.name+"成功链接了电脑");
    }

    @Override
    public  void unconnect(){
        System.out.println(this.name+"成功断开了链接 ");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Mouse类

package com.ITheima._polymorphic_test;

public class Mouse implements USB{
    private  String name;

    //无参参

    public Mouse() {
    }

    //有参

    public Mouse(String name) {
        this.name = name;
    }


    //独有方法
    public void dbClick(){
        System.out.println("鼠标点击");
    }

    //get set


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    @Override
    public void connect(){
        System.out.println(this.name+"成功链接了电脑");
    }

    @Override
    public  void unconnect(){
        System.out.println(this.name+"成功断开了链接 ");
    }
}

Computer类

package com.ITheima._polymorphic_test;

public class Computer {
    private String name;

    //无参
    public Computer() {
    }

    //有参
    public Computer(String name) {
        this.name = name;
    }

    //独有功能
     public  void start(){
         System.out.println(this.name+"电脑开机了");
     }

    /**
     * 提供安装USB设备的入口
     */
    public void installUSB(USB usb) {
        //多态
        //接入
        usb.connect();
        //独有接口
        if (usb instanceof KeyBoard) {
            KeyBoard k = (KeyBoard) usb;
            k.keyDown();
        } else if (usb instanceof Mouse) {
            Mouse m=(Mouse)usb;
            m.dbClick();
        }
        //拔出
        usb.connect();
    }

    //set/get
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Test类

package com.ITheima._polymorphic_test;


/**
 * USB街交口==规范
 * 1 定义USB接口:接入  拔出
 * 2 定义2个USB的实现类: 鼠标  键盘
 * 3 创建一个电脑对象, 创建USB设备对象 安装启动
 */
public class Test {
    public static void main(String[] args) {
        //a 创建电脑对象
        Computer c=new Computer("外星人");
        c.start();

        //b 创建鼠标对象 键盘对象
        USB u=new KeyBoard("键盘");
        USB k=new Mouse("鼠标");

        c.installUSB(u);
        c.installUSB(k);

    }
}

 内部类

 

 

 Outer类 及 Inner静态内部类

package com.ITheima._innerclass_static;

/**
 * 外部内
 */
public class Outer {
    public static int a=199;
    private String hobby="篮球";
    /**
     * 学习静态成员内部类
     */

    public static class Inner{
        private  String name;
        private  int age;
        public  static String schoolName;

        public Inner() {
        }

        public Inner(String name, int age) {
            this.name = name;
            this.age = age;
        }

        public static String getSchoolName() {
            return schoolName;
        }

        public void show(){
            System.out.println("名称"+name);
            //静态内部类中可以直接访问外部类的静态成员
            System.out.println(Outer.a);
            System.out.println(a);
            //外部类的实例成员必须用外部类对象访问
            //System.out.println(hobby); 报错
            Outer o=new Outer();
            System.out.println(o.hobby);
        }

        public static void setSchoolName(String schoolName) {
            Inner.schoolName = schoolName;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }
    }


}

 

 

 

 

 匿名内部类                   

  

 

 

package com.ITheima._anonymous;

/**
 * 目标:学习匿名内部类的形式和特点
 */
public class Test {
    public static void main(String[] args) {
        Animal a=new Animal() {
            @Override
            public void run() {
                System.out.println("老虎跑的快");
            }
        };
        a.run();
    }
}

//class Tiger extends Animal{
//    @Override
//    public void run() {
//        System.out.println("老虎跑的快");
//    }
//}

abstract class Animal{
   public abstract void run();
}

 

 

    

 

 

package com.ITheima._anonymous;

/**
 * 目标:掌握匿名内部类的使用形式(语法)
 */
public class Test1 {
    public static void main(String[] args) {
        //匿名内部类
        Swimming s=new Swimming(){
            @Override
            public  void swim(){
                System.out.println("学生快乐的游泳");
            }
        };
        go(s);
        System.out.println("-----------------------");
        Swimming s1=new Swimming() {
            @Override
            public void swim() {
                System.out.println("老师游泳游泳的很快" );
            }
        };
        go(s1);
    }

    /**
     * 学生,老师 运动员可以一起参加比赛
     */
    public static void go(Swimming s){
        System.out.println("开始");
        s.swim();
        System.out.println("结束");
    }
}

interface Swimming{
    void swim();
}