java javac显示错误而没有警告
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javac show error without warnings
提问by ren
I'm using Sun's javac 1.6.0_26. I invoke it like this:
我使用的是 Sun 的 javac 1.6.0_26。我这样调用它：
javac -Xlint -encoding UTF-8
and usually if there are errors only them are displayed. However this code
通常如果有错误，只会显示它们。然而这段代码
class Test{
public static void main(String args[]) {
java.util.Date d = new java.util.Date();
system.out.println(d.getDate());
}
produces both warning and error:
产生警告和错误：
java:5: warning: [deprecation] getDate() in java.util.Date has been deprecated
system.out.println(d.getDate());
^
java:5: package system does not exist
system.out.println(d.getDate());
So my question is: how do I make javac show only errors (without warnins) when there are any and all warnings when there are no errors (never both)?
所以我的问题是：当没有错误（从来没有）时有任何和所有警告时，我如何让 javac 只显示错误（没有警告）？
回答by COD3BOY
There is a standard option in javac -nowarnwhich disable warning messages. You can get more informations from javac-options
javac 中有一个标准选项-nowarn可以禁用警告消息。您可以从javac-options获取更多信息
回答by Martijn Courteaux
It's a bad idea to ignore the compiler warnings. Most of the time they are really important. Only if you are very sure that you want to ignore a warning you can add an annotation:
忽略编译器警告是个坏主意。大多数时候它们真的很重要。只有当您非常确定要忽略警告时，才可以添加注释：
@SuppressWarnings("deprecation")
System.out.println(d.getDate());
It's like you are thinking: Let me first fix errors and afterwards the warnings.But I don't think that is a nice way of working. To solve warnings, you mighthave to change a lot of code, and all your other error-solving work was unneeded because you needed other code. It is always good the look at a problem globally.
就像您在想：让我先修复错误，然后再修复警告。但我不认为这是一种很好的工作方式。要解决警告，您可能需要更改大量代码，并且不需要所有其他解决错误的工作，因为您需要其他代码。在全球范围内看待问题总是好的。
