问题描述
如果我的代码中有这样的内容：
If I have something like this in my code:
String line = r.readLine(); //Where r is a bufferedReader
如果下一行是结束，我怎么能避免崩溃文件？ （即null）
How can I avoid a crash if the next line is the end of the file? (i.e. null)
我需要阅读下一行，因为我可能需要处理某些内容，但如果没有代码只是崩溃。
I need to read the next line because there may be something there that I need to deal with but if there isn't the code just crashes.
如果有什么东西那么一切都没问题，但我不能保证那里会有东西。
If there is something there then all is OK, but I can't be guaranteed that there will be something there.
所以如果我这样做:(伪代码）：
So if I do something like: (pseudo code):
if (r.readLine is null)
//End code
else {check line again and excecute code depending on what the next line is}
我遇到的问题是，当我检查该行反对null时，它已经移动到下一行，那么我该如何再次检查呢？
The issue I have with something like this is, that when I check the line against null, it already moves onto the next line, so how can I check it again?
我还没有想出办法 - 任何建议都会有很大的帮助。
I've not worked out a way to do this - any suggestions would be a great help.
推荐答案
Am ...你可以简单地使用这样的结构：
Am... You can simply use such construction:
String line;
while ((line = r.readLine()) != null) {
// do your stuff...
}
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