//父類.并且使用用接口
package cn.yjlblog.wwww;

public interface Compute {
 int computer(int n,int m);//抽象方法，勝率abstract ，public


}

//子類add 實(shí)現(xiàn)加法運(yùn)算
package cn.yjlblog.wwww;

public class add implements Compute{

 @Override //接口的實(shí)現(xiàn)類和抽象類的子類是一樣的，要想可以使用new 一個對象，就必須對“抽象類”里的方法
   //進(jìn)行重寫
 public int computer(int n, int m) {
  // TODO Auto-generated method stub
  return n+m;
 }


}

package cn.yjlblog.wwww;
//子類subtract 實(shí)現(xiàn)減法運(yùn)算
public class subtract implements Compute{

 @Override
 public int computer(int n, int m) {
  // TODO Auto-generated method stub
  return n-m;
 }

}

子類multiplied 實(shí)現(xiàn)乘法運(yùn)算
package cn.yjlblog.wwww;

public class multiplied implements Compute{

 @Override
 public int computer(int n, int m) {
  // TODO Auto-generated method stub
  return n*m;
 }


}

package cn.yjlblog.wwww;
//子類divided 實(shí)現(xiàn)整除運(yùn)算
public class divided implements Compute{

 @Override
 public int computer(int n, int m) {
  // TODO Auto-generated method stub
  return n/m;
 }


}

//應(yīng)用類UseComepute 用來
package cn.yjlblog.wwww;

public class UseComepute {
 public void useCom(Compute com,int one,int two){
  int x = com.computer(one, two);
  System.out.println("運(yùn)算結(jié)果為："+x);

 }


}

//測試類Test
package cn.yjlblog.wwww;

public class Test {
 public static void main(String[] args) {
  UseComepute uc = new UseComepute();//應(yīng)用類生成對象，使用useCome 方法
  int one = 10;
  int two = 20;
  Compute ad = new add();//接口的多態(tài)
  Compute sub = new subtract();
  Compute mul= new multiplied();
  Compute div = new divided();
  uc.useCom(ad, one, two);
  uc.useCom(sub, one, two);
  uc.useCom(mul, one, two);
  uc.useCom(div, one, two);

  //哈哈，類的名字忘記大寫了

 }

}

public abstract void Printer() {
public void open() {
system.out.print("打印機(jī)開啟");
}
public void close() {
system.out.print("打印機(jī)關(guān)閉");
}
abstract void print(); //把print方法定義為抽象方法
}

public HPPrinter extends Printer {
void print(){ //必須重寫抽象方法print() 
system.out.print("惠普打印機(jī)開始打印");
};
}

public CanonPrinter extends Printer {
void print(){ //必須重寫抽象方法print()
system.out.print("佳能打印機(jī)開始打印");
};
}

public abstract class People { //關(guān)鍵詞abstract，聲明該類為抽象類
 void Num();　　　　　　
 abstract void Name(); 　　　//聲明該方法為抽象方法
}
 
Interface Person {
　　void Num();
　　void Name();
}