第十次作业

题目1：

编写一个应用程序，模拟中介和购房者完成房屋购买过程。

interface Business{
	double RATIO = 0.022;
	double TAX = 0.03;
	void buying(double price);
}
class Buyer implements Business{
	String name;
	public void buying(double price) {
		System.out.println(name+"购买一套标价为"+price+"元的住宅");
	}
}
class Intermediary implements Business{
	Buyer buyer;
	Intermediary(Buyer buyer){
		this.buyer=buyer;
	}
	public void buying(double price) {
		charing(price);
	}
	public void charing(double price) {
		System.out.println("房屋中介费："+price*RATIO+"交纳的契税"+price*TAX);
	}
}
public class zuoyeb {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner reader=new Scanner(System.in);
		Buyer b=new Buyer();
		b.name="Lisa";
		double price=reader.nextDouble();
		b.buying(price);
		Intermediary i=new Intermediary(b);
		i.buying(price);
	}

}

 

 

题目2：

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。

package zuoyea;
import java.util.Scanner;
class yichang extends Exception{
 yichang(String x){
  super(x);
 }
}
public class zy {

 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Scanner reader=new Scanner(System.in);
  double sum=0;
   try
   { 
    for(int i=1;i<=5;i++)
    {
     System.out.println("请输入第"+i+"学生的成绩");
     double x=reader.nextDouble();
     if(x<0||x>100)
      throw new yichang("输入非法值");
     sum+=x;
     System.out.println("累加和"+sum);
    }
    System.out.println("平均值："+sum/5);
   }
   catch(yichang y)
   {
    System.out.println(y.toString());
    
   }
  
  
 }

}