第十次作业

作业1

1．业务接口

package lianxi4;

public interface Business {
double RATIO=0.022;
double TAX=0.03;
 void buying (double price);
}

2．购房者类

package lianxi4;

public class Buyer implements Business{
 String name;//表示购房者姓名
 public Buyer(String name) {
    this.name=name;
}
 public void buying (double price){                         //显示输出购买一套标价为price元的住宅
     System.out.println(name+"购买了一套总价为"+price+"元的住宅");
 } 
}

3．中介类

package lianxi4;

public class Intermediary implements Business{
    Buyer buyer;
    Intermediary(Buyer buyer)     //构造方法
    {
        this.buyer=buyer;
        
    }
    public void buying (double price){
        buyer.buying(price);
        this.charing(price);
    }
    public void charing(double price){
        System.out.println("中介费为"+price*RATIO);
        System.out.println("契税为"+price*TAX);
    }

}

4．Test类

package lianxi4;

import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
     Buyer buyer =new Buyer("Lisa");
    
     Intermediary intermediary = new Intermediary(buyer);
    Scanner reader = new Scanner(System.in);
    System.out.println("请输入要购买房屋的标价：");
    double price = reader.nextDouble();
    intermediary.buying(price);

    }

}

运行结果

作业2

题目简述

输入5个数，代表学生成绩，计算其平均成绩。当输入值为负数或大于100时，通过自定义异常处理进行提示。

1.异常类

package lianxi3;

public class MyException extends Exception{

    public String myMessm(){


        return "成绩不能小于零或大于100,请重新输入！";
  }
}

2.计算类

package lianxi3;

import java.util.Scanner;

public class Jisuan {

    public int i;

    public void jisuan(){
        Scanner reader = new Scanner(System.in);
        System.out.println("请输入5个成绩");
        int sum=0;
        for(i=0;i<=4;i++){
            int a=reader.nextInt();
            try {
                if(a<0||a>100)
                  throw new MyException();
                sum=sum+a;
                
            } catch (Exception e) {
                System.out.println(((MyException) e).myMessm());
            }
            if(a<0||a>100)
                i--;
        }
        
        int ave=sum/5;
        System.out.println("平均成绩是："+ave);
          
        }
}

3.主类

package lianxi3;

public class Example {

    public static void main(String[] args) {
Jisuan s1 =new Jisuan();
  s1.jisuan();
        
    }
}

运行结果