java基础--自定义异常使用练习

 1 package javatest;
 2 
 3 class EnemyHeroIsDeadException extends Exception {
 4     public EnemyHeroIsDeadException() {}
 5     
 6     public EnemyHeroIsDeadException(String msg) {
 7         super(msg);
 8     }
 9 }
10 
11 public class Hero {
12     public String heroName;
13     protected float lifePoint;
14     
15     public void attackHero(Hero h) throws EnemyHeroIsDeadException {
16         if (h.lifePoint == 0) {
17             throw new EnemyHeroIsDeadException(h.heroName + " hero has been dead");
18         }
19     }
20     
21     public String toString() {
22         return heroName;
23     }
24     
25     public static void main(String[] args) throws EnemyHeroIsDeadException {
26         Hero galan = new Hero();
27         galan.heroName = "galan";
28         galan.lifePoint =0;
29         
30         Hero mike = new Hero();
31         mike.heroName = "mike";
32         mike.lifePoint =10;
33         
34         try {
35             mike.attackHero(galan);
36         } catch (EnemyHeroIsDeadException e) {
37             System.out.println("具体原因 " + e.getMessage());
38             e.printStackTrace();
39         }
40     }
41 }