1 package day4.haifei03;
2
3 /*
4 3.7 自定义异常
5 public class 自定义异常类名 extends Exception {
6 无参构造
7 有参构造
8 }
9
10 3.8 throws和throw的区别
11 */
12 public class ScoreException extends Exception{
13
14 public ScoreException(){}
15
16 public ScoreException(String message){
17 super(message); //将message传给父类
18 }
19
20 }
1 package day4.haifei03;
2
3 public class Teacher {
4
5 public void checkScore(int score) throws ScoreException{
6 if(score<0 || score>100){
7 //注意是throw；记得要方法名处要throws ScoreException，不然红色波浪线警告
8 // throw new ScoreException(); //无参构造
9 throw new ScoreException("输入分数有误"); //有参构造
10 }else {
11 System.out.println("分数正常");
12 }
13 }
14
15 }
1 package day4.haifei03;
2
3 import java.util.Scanner;
4
5 public class TeacherDemo {
6 public static void main(String[] args) {
7 Scanner sc = new Scanner(System.in);
8 System.out.println("请输入分数：");
9 int score = sc.nextInt();
10
11 Teacher t = new Teacher();
12 try {
13 t.checkScore(score); //编译时异常 try-catch显示处理
14 } catch (ScoreException e) {
15 e.printStackTrace();
16 }
17
18 /*请输入分数：
19 222
20 day4.haifei03.ScoreException
21 at day4.haifei03.Teacher.checkScore(Teacher.java:7)
22 at day4.haifei03.TeacherDemo.main(TeacherDemo.java:13)*/
23
24 /*请输入分数：
25 -44
26 day4.haifei03.ScoreException: 输入分数有误
27 at day4.haifei03.Teacher.checkScore(Teacher.java:9)
28 at day4.haifei03.TeacherDemo.main(TeacherDemo.java:13)*/
29 }
30 }
