使用 Finally 的疑惑，请大家一起讨论！

原创于 2010-12-17 13:40:55 发布 · 133 阅读

0 ·

CC 4.0 BY-SA版权

java 综合专栏收录该内容

103 篇文章

订阅专栏

本文探讨了Java中finally块如何影响方法的返回值。通过一个具体示例，展示了即使在try块中设置了返回值，finally块仍可以对其进行更改。

有以下程序：

public class FinallyTest   
{  
    public static void main(String args[])  
    {  
        System.out.println("in main return: " + new FinallyTest().getString());  
    }  
      
    public String getString()  
    {  
        String returnString = null;  
        try  
        {  
            returnString = "this string will be return.";  
            return returnString;          
        }finally  
        {             
            System.out.println("execute finally...");  
            System.out.println("before clean returnString's value: " + returnString);  
            returnString = null;  
            System.out.println("after  clean returnString's value: " + returnString);  
            System.out.println("execute finally end.");  
        }         
    }  
}

输入出结果是：

execute finally...
before clean returnString's value: this string will be return.
after clean returnString's value: null
execute finally end.
in main return: this string will be return.