Java异常处理

 1 /**
 2  * 主类，包含一个计算平均成绩的类方法，一个主方法;
 3  */
 4 package cn.edu.ccut.object1;
 5 import java.util.*;
 6 
 7 public class Test {
 8 
 9     /**
10      * @param args
11      */
12     public static double getaverage() throws MyException{
13         int score;
14         int sum = 0;
15         Scanner reder = new Scanner(System.in);
16         System.out.println("请输入5个成绩：");
17         for(int i = 0 ; i < 5 ; i++){
18             score = reder.nextInt();
19             if(score < 0 || score > 100){
20                 throw new MyException(score); //抛出自定义异常;
21             }
22             sum += score;
23         }
24         return (double)(sum / 5);
25     }                                                            
26     public static void main(String[] args) {
27         // TODO Auto-generated method stub
28         try{
29             System.out.println("平均成绩是"+getaverage());
30         }
31         catch(MyException a){                  //捕获自定义异常;
32             System.out.print("程序异常,"+a);
33         }
34     }
35 }

 1 /**
 2  * 自定义异常
 3  */
 4 package cn.edu.ccut.object1;
 5 
 6 public class MyException extends Exception{
 7     int sc;
 8     MyException(int a){
 9         sc = a;
10     }
11     public String toString(){
12         return "输入的成绩"+sc+"超范围";  //自定义异常描述信息;
13     }
14 }