初学java之异常类

 1 //异常类
 2 package st;
 3 public class example_1
 4 {
 5     public static void main(String args[])
 6     {
 7         int n=0,m=0,t=1000;
 8         try
 9         {
10             m=Integer.parseInt("8888");
11             n=Integer.parseInt("ab89");
12             t=7777;  //t没有机会被赋值
13         }
14         catch(NumberFormatException e)
15         {
16           System.out.println("发生异常："+    e.getMessage());
17         }
18         System.out.println("n="+n+",m="+m+",t="+t);
19         try
20         {
21             System.out.println("故意抛出I/O异常！");
22             throw new java.io.IOException("我是故意的"); //故意抛出异常
23             
24         }
25         catch(java.io.IOException e)
26         {
27           System.out.println("发生异常:"+e.getMessage());
28         }
29     }
30 }

/*
发生异常：For input string: "ab89"
n=0,m=8888,t=1000
故意抛出I/O异常！
发生异常:我是故意的

*/

 1 package st ;
 2  /*  和接口有关的匿名类  */
 3 interface SpeakHello
 4 {
 5   void speak();
 6 }
 7 class HelloMachine
 8 {
 9     public void turnon(SpeakHello hello)
10     {
11         hello.speak();
12     }
13 }
14 public class example_1
15 {
16     public static void main(String args[])
17     {
18      HelloMachine machine =new HelloMachine();
19       machine.turnon( new SpeakHello(){
20        public void speak(){
21          System.out.println("hello ,you are welcome !");
22        }
23      }
24     );
25     machine.turnon( new SpeakHello()
26     {
27         public void speak()
28         {
29             System.out.println("你好，欢迎光临！");    
30         }
31     }
32     );
33     }
34 }

/*
hello ,you are welcome !
你好，欢迎光临！

*/