Java超詳細透徹講解介面

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();//呼叫自己定義的重寫的方法
		super.method3();//呼叫的是父類別中宣告的
		//呼叫介面中的預設方法
		CompareA.super.method3();
		CompareB.super.method3();
	}

interface Filial {// 孝順的
	default void help() {
		System.out.println("老媽，我來救你了");
	}
}
interface Spoony {// 痴情的
	default void help() {
		System.out.println("媳婦，別怕，我來了");
	}
}
class Father{
	public void help(){
		System.out.println("兒子，就我媳婦！");
	}
}
class Man extends Father implements Filial, Spoony {
	@Override
	public void help() {
		System.out.println("我該就誰呢？");
		Filial.super.help();
		Spoony.super.help();
	}	
}

/*
實現類SubAdapter必須給出介面SubInterface以及父介面MyInterface
中所有方法的實現。否則，SubAdapter仍需宣告為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.建立了介面的非匿名實現類的非匿名物件
		Flash flash = new Flash();
		com.transferData(flash);
		//2. 建立了介面的非匿名實現類的匿名物件
		com.transferData(new Printer());
		//3. 建立了介面的匿名實現類的非匿名物件
		USB phone = new USB(){
			@Override
			public void start() {
				System.out.println("手機開始工作");
			}
			@Override
			public void stop() {
				System.out.println("手機結束工作");
			}			
		};
		com.transferData(phone);
		//4. 建立了介面的匿名實現類的匿名物件
		com.transferData(new USB(){
			@Override
			public void start() {
				System.out.println("mp3開始工作");
			}
			@Override
			public void stop() {
				System.out.println("mp3結束工作");
			}
		});
	}
}
class Computer{	
	public void transferData(USB usb){//USB usb = new Flash();
		usb.start();		
		System.out.println("具體傳輸資料的細節");		
		usb.stop();
	}		
}
interface USB{
	//常數：定義了長、寬、最大最小的傳輸速度等	
	void start();	
	void stop();	
}
class Flash implements USB{
	@Override
	public void start() {
		System.out.println("U盤開啟工作");
	}
	@Override
	public void stop() {
		System.out.println("U盤結束工作");
	}	
}
class Printer implements USB{
	@Override
	public void start() {
		System.out.println("印表機開啟工作");
	}
	@Override
	public void stop() {
		System.out.println("印表機結束工作");
	}	
}

//舉例一：
interface Network {
    public void browse();
    }
// 被代理類
class RealServer implements Network { @Override
    public void browse() {
    System.out.println("真實伺服器上
    網瀏覽資訊");
    } 
}
// 代理類
class ProxyServer implements Network {
    private Network network;
    public ProxyServer(Network network) {
    this.network = network; }
    public void check() {
    System.out.println("檢查網路連線等操作");
}
    public void browse() {
    check();
    network.browse();
    } 
}
public class ProxyDemo {
    public static void main(String[] args) {
    Network net = new ProxyServer(new
    RealServer());
    net.browse();
    } 
}
//舉例二：
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();// 面談
	void signContract();// 籤合同
	void bookTicket();// 訂票
	void sing();// 唱歌
	void collectMoney();// 收錢
}
//被代理類
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() {
	}
}
//代理類
class Proxy implements Star {
	private Star real;
	public Proxy(Star real) {
		this.real = real;
	}
	public void confer() {
		System.out.println("經紀人面談");
	}
	public void signContract() {
		System.out.println("經紀人籤合同");
	}
	public void bookTicket() {
		System.out.println("經紀人訂票");
	}
	public void sing() {
		real.sing();
	}
	public void collectMoney() {
		System.out.println("經紀人收錢");
	}
}

//題目一：
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();
    } 
}
//題目二：
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());
    } 
}