java自定义异常

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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23.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*/

总结

1）先定义一个类去继承Exception
2）对Exception的方法进行重写
3）在方法中设定错误条件并抛出对象

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