// 抽象類：被abstract修飾的類
public abstract class Shape {
    // 抽象方法：被abstract修飾的方法，沒(méi)有方法體
    abstract public void draw();
    abstract void calcArea();
    // 抽象類也是類，也可以增加普通方法和屬性
    protected double area; // 面積
    public double getArea(){
        return area;
    }
}

abstract class Shape {
    //抽象方法
    public abstract void draw();
}

class Rect extends Shape {
    @Override
    public void draw() {
        System.out.println("畫(huà)一個(gè)矩形！");
    }
}

class Cycle extends Shape {
    @Override
    public void draw() {
        System.out.println("畫(huà)一個(gè)圓！");
    }
}

class Triangle extends Shape {
    @Override
    public void draw() {
        System.out.println("畫(huà)一個(gè)三角形！");
    }
}

class Flower extends Shape {
    @Override
    public void draw() {
        System.out.println("畫(huà)一朵?！");
    }
}

public class Test {
    //向上轉(zhuǎn)型實(shí)現(xiàn)多態(tài)
    public static void drawMap(Shape shape) {
        shape.draw();
    }
    public static void main(String[] args) {
        Rect rect = new Rect();
        drawMap(rect);
        drawMap(new Cycle());
        drawMap(new Triangle());
        drawMap(new Flower());
    }
}

public interface 接口名稱{
    // 抽象方法
    public abstract void method1(); 
    // public abstract 是固定搭配，可以不寫(xiě)
    public void method2();
    abstract void method3();
    void method4();
    // 注意：在接口中上述寫(xiě)法都是抽象方法，跟推薦方式4，代碼更簡(jiǎn)潔
}

// USB接口
public interface USB {
    void openDevice();
    void closeDevice();
}
// 鼠標(biāo)類，實(shí)現(xiàn)USB接口
public class Mouse implements USB {
    @Override
    public void openDevice() {
        System.out.println("打開(kāi)鼠標(biāo)");
    }
    @Override
    public void closeDevice() {
        System.out.println("關(guān)閉鼠標(biāo)");
    }
    public void click(){
        System.out.println("鼠標(biāo)點(diǎn)擊");
    }
}
// 鍵盤(pán)類，實(shí)現(xiàn)USB接口
public class KeyBoard implements USB {
    @Override
    public void openDevice() {
        System.out.println("打開(kāi)鍵盤(pán)");
    }
    @Override
    public void closeDevice() {
        System.out.println("關(guān)閉鍵盤(pán)");
    }
    public void inPut(){
        System.out.println("鍵盤(pán)輸入");
    }
}
// 筆記本類：使用USB設(shè)備
public class Computer {
    public void powerOn(){
        System.out.println("打開(kāi)筆記本電腦");
    }
    public void powerOff(){
        System.out.println("關(guān)閉筆記本電腦");
    }
    public void useDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse = (Mouse)usb;
            mouse.click();
        }else if(usb instanceof KeyBoard){
            KeyBoard keyBoard = (KeyBoard)usb;
            keyBoard.inPut();
        }
        usb.closeDevice();
    }
}

// 測(cè)試類：
public class TestUSB {
    public static void main(String[] args) {
        Computer computer = new Computer();
        computer.powerOn();
        // 使用鼠標(biāo)設(shè)備
        computer.useDevice(new Mouse());
        // 使用鍵盤(pán)設(shè)備
        computer.useDevice(new KeyBoard());
        computer.powerOff();
    }
}

//動(dòng)物類
class Animal {
    protected String name;
    public Animal(String name) {
        this.name = name;
    }
}
//提供一組接口, 分別表示 "會(huì)飛的", "會(huì)跑的", "會(huì)游泳的".
interface IFlying {
    void fly();
}
interface IRunning {
    void run();
}
interface ISwimming {
    void swim();
}
//貓, 是會(huì)跑的.
class Cat extends Animal implements IRunning {
    public Cat(String name) {
        super(name);
    }
    @Override
    public void run() {
        System.out.println(this.name + "正在用四條腿跑");
    }
}
//魚(yú), 是會(huì)游的.
class Fish extends Animal implements ISwimming {
    public Fish(String name) {
        super(name);
    }
    @Override
    public void swim() {
        System.out.println(this.name + "正在用尾巴游泳");
    }
}
//青蛙, 既能跑, 又能游
class Frog extends Animal implements IRunning, ISwimming {
    public Frog(String name) {
        super(name);
    }
    @Override
    public void run() {
        System.out.println(this.name + "正在往前跳");
    }
    @Override
    public void swim() {
        System.out.println(this.name + "正在蹬腿游泳");
    }
}
//鴨子，可以飛、跑和游泳
class Duck extends Animal implements IRunning, ISwimming, IFlying {
    public Duck(String name) {
        super(name);
    }
    @Override
    public void fly() {
        System.out.println(this.name + "正在用翅膀飛");
    }
    @Override
    public void run() {
        System.out.println(this.name + "正在用兩條腿跑");
    }
    @Override
    public void swim() {
        System.out.println(this.name + "正在漂在水上");
    }
}

public static void funRun(IRunning running) {
        running.run();
}

public class Test {
    public static void funRun(IRunning running) {
        running.run();
    }
    public static void main(String[] args) {
        Cat cat = new Cat("小貓");
        funRun(cat);

        Frog frog = new Frog("小青蛙");
        funRun(frog);
    }
}

class Robot implements IRunning {
    private String name;
    public Robot(String name) {
        this.name = name;
    }
    @Override
    public void run() {
        System.out.println(this.name + "正在用輪子跑");
    }
}

public class Test {
    public static void funRun(IRunning running) {
        running.run();
    }

    public static void main(String[] args) {
        Robot robot = new Robot("機(jī)器人");
        funRun(robot);
    }
}

interface IFLying {
    void flying();
}
interface ISwimming {
    void swimming();
}
interface IRunning {
    void running();
}
//把IRunning,ISwimming,Iflying全部繼承到IThreehabitat上
interface IThreehabitat extends IFLying,IRunning,ISwimming{

}

class Animal {
    public String name;

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

}

class Duck extends Animal implements IThreehabitat {

    public Duck(String name) {
        super(name);
    }

    @Override
    public void flying() {
        System.out.println(name + "正在飛！");
    }

    @Override
    public void swimming() {
        System.out.println(name + "正在游泳！");
    }

    @Override
    public void running() {
        System.out.println(name + "正在跑！");
    }
}



public class Test {
    public static void func(IThreehabitat iThreehabitat) {
        iThreehabitat.flying();
        iThreehabitat.running();
        iThreehabitat.swimming();
    }

    public static void main(String[] args) {
        func(new Duck("小黃"));
    }
}