package myexception;



 class MyException  extends Exception
{
    private String  message;
    MyException()
    {   
    }
    MyException(String s)
    {
        this.message=s;
    }
    public String toString()
    {
        String s="您输入的有误";
        return s;
    }
}

public class TestMyException
{
    public static void main(String[] args)
    {
        //int a=1;
        int b=0;
        try
        {
            if(b==0)
                throw new MyException();
        }
        catch(Exception e)
        {
            //e.printStackTrace();
            System.out.println(e.toString());               //这里的输出是：您输入的有误，但是这个输出是子类的方法，e是Exception类型，是我自              //                                                                         定义异常类的父类，为什么会输出呢？？并且toSting方法提示时显示的是Throwable类中  //                                                                          的方法？？   
        }
    }
}


新手  求大神解答？？？拜谢！！

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