java中的异常处理机制_finally的使用

finally总结:

  finally代码块:定义一定执行的代码

  通常用于关闭资源或者某些一定执行的代码

 

 

实例1:finally功能演示


class FuShuException extends Exception
{
    FuShuException(String m)
    {
        super(m);
    }
}


class Demo 
{
    public int div(int x,int y) throws FuShuException
    {
        if(y<0)
        {
            throw new FuShuException("除数为负数");
        }
        return x/y;
    }
}


class ExceptionDemo1
{
    public static void main(String args[])
    {
        Demo d=new Demo();
        try
        {
            int x=d.div(4,-1);
            System.out.println("x="+x);
        }
        catch(FuShuException e)
        {
            System.out.println(e.toString());
        }
        finally
        {
            System.out.println("finally");        //finally存放的是一定会被执行的代码
        }
        System.out.println("over");
    }
}

 


 

运行结果:

FuShuException: 除数为负数
finally
over

 

实例2:

 1 class FuShuException extends Exception
 2 {
 3     FuShuException(String m)
 4     {
 5         super(m);
 6     }
 7 }
 8 
 9 
10 class Demo 
11 {
12     public int div(int x,int y) throws FuShuException
13     {
14         if(y<0)
15         {
16             throw new FuShuException("除数为负数");
17         }
18         return x/y;
19     }
20 }
21 
22 
23 class ExceptionDemo1
24 {
25     public static void main(String args[])
26     {
27         Demo d=new Demo();
28         try
29         {
30             int x=d.div(4,-1);
31             System.out.println("x="+x);
32         }
33         catch(FuShuException e)
34         {
35             System.out.println(e.toString());
36             return;
37         }
38         finally
39         {
40             System.out.println("finally");        //finally存放的是一定会被执行的代码
41         }
42         System.out.println("over");
43     }
44 }

 

运行结果:

FuShuException: 除数为负数
finally

 

posted @ 2016-06-15 22:20  Qi_Yuan  阅读(505)  评论(0编辑  收藏  举报