java 自定义异常

 

/*下面做了归纳总结,欢迎批评指正*/

/*自定义异常*/
class ChushulingException extends Exception
{
    public ChushulingException(String msg)
    {
        super(msg);
    }
}

class ChushufuException extends Exception
{
    public ChushufuException(String msg)
    {
        super(msg);
    }
}

/*自定义异常 End*/

class Numbertest
{
    public int shang(int x,int y) throws ChushulingException,ChushufuException
    {
        if(y<0)
        {
            throw new ChushufuException("您输入的是"+y+",规定除数不能为负数!");//抛出异常

        }
        if(y==0)
        {
            throw new ChushulingException("您输入的是"+y+",除数不能为0!");
        }

        int m=x/y;
        return m;
    }
}





class Rt001
{
    public static void main(String[]args)
    {
        Numbertest n=new Numbertest();

        //捕获异常

        try
        {
            System.out.println("商="+n.shang(1,-3));
        }
        catch(ChushulingException yc)
        {
            System.out.println(yc.getMessage());
            yc.printStackTrace();
        }
        catch(ChushufuException yx)
        {
            System.out.println(yx.getMessage());
            yx.printStackTrace();
        }
        catch(Exception y)
        {
            System.out.println(y.getMessage());
            y.printStackTrace();
        }

    finally{ System.out.println("finally!");} ////finally不管发没发生异常都会被执行


    }
}
/*
[总结]

1.自定义异常:

class 异常类名 extends Exception
{
    public 异常类名(String msg)
    {
        super(msg);
    }
}

2.标识可能抛出的异常:

throws 异常类名1,异常类名2

3.捕获异常:
try{}
catch(异常类名 y){}
catch(异常类名 y){}

4.方法解释
getMessage() //输出异常的信息
printStackTrace() //输出导致异常更为详细的信息


*/