Java超详细透彻讲解接口

class SubClass extends SuperClass implements InterfaceA{ }

public interface Runner {
  int ID = 1;//<=>public static final int ID = 1;
  void start();//<=>public abstract void start();
  public void run();//<=>public abstract void run();
  void stop();//<=>public abstract void stop();
}

public void myMethod(){
		method3();//调用自己定义的重写的方法
		super.method3();//调用的是父类中声明的
		//调用接口中的默认方法
		CompareA.super.method3();
		CompareB.super.method3();
	}

interface Filial {// 孝顺的
	default void help() {
		System.out.println("老妈，我来救你了");
	}
}
interface Spoony {// 痴情的
	default void help() {
		System.out.println("媳妇，别怕，我来了");
	}
}
class Father{
	public void help(){
		System.out.println("儿子，就我媳妇！");
	}
}
class Man extends Father implements Filial, Spoony {
	@Override
	public void help() {
		System.out.println("我该就谁呢？");
		Filial.super.help();
		Spoony.super.help();
	}	
}

/*
实现类SubAdapter必须给出接口SubInterface以及父接口MyInterface
中所有方法的实现。否则，SubAdapter仍需声明为abstract的。
*/
interface MyInterface{
    String s=“MyInterface”;
    public void absM1();
    }
interface SubInterface extends MyInterface{
    public void absM2();
    }
public class SubAdapter implements SubInterface{
    public void absM1(){System.out.println(“absM1”);}
    public void absM2(){System.out.println(“absM2”);}
}

interface Runner { public void run();}
interface Swimmer {public double swim();}
class Creator{public int eat(){…}} 
class Man extends Creator implements Runner ,Swimmer{
    public void run() {……}
    public double swim() {……}
    public int eat() {……}
}

public class Test{
  public static void main(String args[]){
    Test t = new Test();
    Man m = new Man();
    t.m1(m);
    t.m2(m);
    t.m3(m);
  }
  public String m1(Runner f) { f.run(); }
  public void m2(Swimmer s) {s.swim();}
  public void m3(Creator a) {a.eat();}
}

public class USBTest {
	public static void main(String[] args) {
		Computer com = new Computer();
		//1.创建了接口的非匿名实现类的非匿名对象
		Flash flash = new Flash();
		com.transferData(flash);
		//2. 创建了接口的非匿名实现类的匿名对象
		com.transferData(new Printer());
		//3. 创建了接口的匿名实现类的非匿名对象
		USB phone = new USB(){
			@Override
			public void start() {
				System.out.println("手机开始工作");
			}
			@Override
			public void stop() {
				System.out.println("手机结束工作");
			}			
		};
		com.transferData(phone);
		//4. 创建了接口的匿名实现类的匿名对象
		com.transferData(new USB(){
			@Override
			public void start() {
				System.out.println("mp3开始工作");
			}
			@Override
			public void stop() {
				System.out.println("mp3结束工作");
			}
		});
	}
}
class Computer{	
	public void transferData(USB usb){//USB usb = new Flash();
		usb.start();		
		System.out.println("具体传输数据的细节");		
		usb.stop();
	}		
}
interface USB{
	//常量：定义了长、宽、最大最小的传输速度等	
	void start();	
	void stop();	
}
class Flash implements USB{
	@Override
	public void start() {
		System.out.println("U盘开启工作");
	}
	@Override
	public void stop() {
		System.out.println("U盘结束工作");
	}	
}
class Printer implements USB{
	@Override
	public void start() {
		System.out.println("打印机开启工作");
	}
	@Override
	public void stop() {
		System.out.println("打印机结束工作");
	}	
}

//举例一：
interface Network {
    public void browse();
    }
// 被代理类
class RealServer implements Network { @Override
    public void browse() {
    System.out.println("真实服务器上
    网浏览信息");
    } 
}
// 代理类
class ProxyServer implements Network {
    private Network network;
    public ProxyServer(Network network) {
    this.network = network; }
    public void check() {
    System.out.println("检查网络连接等操作");
}
    public void browse() {
    check();
    network.browse();
    } 
}
public class ProxyDemo {
    public static void main(String[] args) {
    Network net = new ProxyServer(new
    RealServer());
    net.browse();
    } 
}
//举例二：
public class StaticProxyTest {
	public static void main(String[] args) {
		Proxy s = new Proxy(new RealStar());
		s.confer();
		s.signContract();
		s.bookTicket();
		s.sing();
		s.collectMoney();
	}
}
interface Star {
	void confer();// 面谈
	void signContract();// 签合同
	void bookTicket();// 订票
	void sing();// 唱歌
	void collectMoney();// 收钱
}
//被代理类
class RealStar implements Star {
	public void confer() {
	}
	public void signContract() {
	}
	public void bookTicket() {
	}
	public void sing() {
		System.out.println("明星：歌唱~~~");
	}
	public void collectMoney() {
	}
}
//代理类
class Proxy implements Star {
	private Star real;
	public Proxy(Star real) {
		this.real = real;
	}
	public void confer() {
		System.out.println("经纪人面谈");
	}
	public void signContract() {
		System.out.println("经纪人签合同");
	}
	public void bookTicket() {
		System.out.println("经纪人订票");
	}
	public void sing() {
		real.sing();
	}
	public void collectMoney() {
		System.out.println("经纪人收钱");
	}
}

//题目一：
interface A {
    int x = 0;
    }
class B {
    int x = 1;
    }
class C extends B implements A {
    public void pX() {
    System.out.println(x);
    }
public static void main(String[] args) {
    new C().pX();
    } 
}
//题目二：
interface Playable {
    void play();
    }
interface Bounceable {
    void play();
}
interface Rollable extends Playable, Bounceable {
    Ball ball = new Ball("PingPang");
}
class Ball implements Rollable {
    private String name;
    public String getName() {
    return name; 
    }
    public Ball(String name) {
    this.name = name; 
    }
    public void play() {
    ball = new Ball("Football");
    System.out.println(ball.getName());
    } 
}