JAVA异常处理及通过异常跳转

 /*
 JAVA异常
 

catch可以跟出多个异常,
catch(Exception e)所有的异常都是Exception的了类,Exception可以处理所有的异常;所以Exception不可以放在第一个catch

throws关键字标识,

自定义异常与Throw关键字

finally{}  无论是return,break语句或者发不发生异常,该语句都会被执行;唯一不被执行System.exit(0);

*/
//下面一段程序是三种异常的实现,包含自定义异常

 class Test{public int devide(int x,int y)throws ArithmeticException,DevideByMinusException//未报告的异常 java.lang.Exception；必须对其进行捕捉或声明以便抛{if(y<0)throw new DevideByMinusException("除数为"+y);int result=x/y;return result;}}class DevideByMinusException extends Exception{public DevideByMinusException (String msg){super(msg);}}class TestException{public static void main(String[] args)//throws Exception{try{//new Test().devide(3,1);//return;new Test().devide(3,-1);//new Test().devide(3,0);}catch(ArithmeticException e){System.out.println("program is running into AritMetic");e.printStackTrace();}catch(DevideByMinusException e){System.out.println("program is running into DevideByMinus");e.printStackTrace();//return;System.exit(0);}catch(Exception e){System.out.println(e.getMessage());}finally{System.out.println("finally");}System.out.println("program is running here!");//Exception in thread "main" java.lang.ArithmeticException: / by zero}}

//通过异常可以实现程序的跳转
/*void fun()
{
 try
 (
 if(x==0)
  throw new XxxException("xxx");
 else
  throw new YyyException("yyy");
  ....
 )
 catch(XxxException e)
 (
  ....
 )
 catch(YyyException e)
 (
  ....
 )
}*/