初学java之异常类

 //异常类
 package st;
 public class example_1
 {
     public static void main(String args[])
     {
         int n=0,m=0,t=1000;
         try
         {
             m=Integer.parseInt("8888");
             n=Integer.parseInt("ab89");
             t=7777;  //t没有机会被赋值
         }
         catch(NumberFormatException e)
         {
           System.out.println("发生异常："+    e.getMessage());
         }
         System.out.println("n="+n+",m="+m+",t="+t);
         try
         {
             System.out.println("故意抛出I/O异常！");
             throw new java.io.IOException("我是故意的"); //故意抛出异常

         }
         catch(java.io.IOException e)
         {
           System.out.println("发生异常:"+e.getMessage());
         }
     }
 }

/*
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

*/

 package st ;
  /*  和接口有关的匿名类  */
 interface SpeakHello
 {
   void speak();
 }
 class HelloMachine
 {
     public void turnon(SpeakHello hello)
     {
         hello.speak();
     }
 }
 public class example_1
 {
     public static void main(String args[])
     {
      HelloMachine machine =new HelloMachine();
       machine.turnon( new SpeakHello(){
        public void speak(){
          System.out.println("hello ,you are welcome !");
        }
      }
     );
     machine.turnon( new SpeakHello()
     {
         public void speak()
         {
             System.out.println("你好，欢迎光临！");
         }
     }
     );
     }
 }

与接口有关的匿名类

/*
hello ,you are welcome !
你好，欢迎光临！

*/