Java异常抛出及try，catch应用实例

 class lanpingException extends Exception
 {
     lanpingException(String msg)
     {
         super(msg);
     }
 }

 class maoyanException extends Exception
 {
     maoyanException(String msg)
     {
         super(msg);
     }
 }

 class Computer
 {
     private int state=2;
     public void run()throws lanpingException,maoyanException
     {
         if(state==1)
         {
             throw new lanpingException("lanping!!!");
         }
         if(state==2)
         {
             throw new maoyanException("maoyan!!!");
         }
         System.out.println("run bat");
     }
     public void reset()
     {
         state=0;
         System.out.println("computer reset!");
     }
 }

 class Teacher
 {
     private String name;
     private Computer comp;
     Teacher(String name)
     {
         this.name=name;
         comp=new Computer();
     }
     public void prelect()throws maoyanException
     {
         try
         {
             comp.run();
             System.out.println(name+" speak");
         }
         catch(lanpingException e)
         {
             System.out.println(e.toString());
             comp.reset();
             prelect();
         }
         catch(maoyanException e)
         {
             System.out.println(e.toString());
             test();
             throw e;
         }
     }
     public void test()
     {
         System.out.println("test yourself!");
     }
 }

 class Kandra
 {
     public static void main(String[] args)
     {
         Teacher pp=new Teacher("cao");
         try
         {
             pp.prelect();

         }
         catch(maoyanException e)
         {
             System.out.println("......");
         }
     }
 }