Java中自定义异常

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/** * 自定义异常 * @author xiaoyu * */public class MyException extends Exception{private static final long serialVersionUID = -1475988675976310889L;public MyException(String msg){super(msg);}}class Numbertest   {public int shang(int x,int y) throws MyException{if(y==0)throw new MyException("您输入的是"+y+",除数不能为0!");  return x/y;}}

测试类：

package exercise.exception;public class Test {/** * @param args */public static void main(String[] args) {Numbertest numbertest=new Numbertest();try {System.out.println(numbertest.shang(11, 0));} catch (MyException e) {System.out.println(e.getMessage());e.printStackTrace();}}}

[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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