Java 自定义异常的实现

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 
*/

代码：

1.自定义异常:

/**
 * 自定义的异常类
 * @author Tracy.Lee
 */
public class MyException extends Exception {
	private static final long serialVersionUID = 1L;

	public MyException(String detailMessage) {
		super(detailMessage);
	}

}

2.标识可能抛出的异常:

class Test   
{  
    public int shang(int x,int y) throws ChushulingException,ChushufuException  
    {  
        if(y==0)  
        {  
            throw new MyException("您输入的是"+y+",除数不能为0!");  
        }  
        int m=x/y;  
        return m;  
    }  
} 

3.捕获异常:

class Rt
{  
    public static void main(String[]args)  
    {  
        Test n=new Test();  
  
        //捕获异常   
        try  
        {  
            System.out.println("商="+n.shang(1,-3));  
        }  
        catch(MyException yc)  
        {  
            System.out.println(yc.getMessage());  
            yc.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     
  
    }  
}