空检查时可能尚未初始化错误 [英] Might not have been initialized error at null check

问题描述

我正在检查变量是否已初始化，但是那时netbeans给了我variable reader might not have been initialized警告.如何解决/抑制这个问题?

I'm checking if the variable is initialized but at that point netbeans is giving me variable reader might not have been initialized warning. How do I fix/suppress this?

这是我的代码(摘要):

This is my code (summary):

final Reader reader;
try {
        reader = new Reader(directory);
        //additional stuff that can cause an exception
    } catch (Exception ex) {
        //do stuff
    } finally {
        if (reader != null);
    }

if检查的重点是确定是否已初始化.

The point of the if check is to determine whether it is initialized.

最佳做法是什么?

推荐答案

如果从未初始化reader，则甚至没有null值.

If reader was never initialized, it doesn't even have a null value.

更改

final Reader reader;

到

Reader reader = null;

确保它具有初始值.

这样，如果reader = new Reader(directory);引发异常，则在经过finally块测试时，reader将包含null.

This way, if reader = new Reader(directory); throws an exception, reader will contain null when tested by the finally block.

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