Java中自定义异常详解及实例代码

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

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