javac show error without warnings

问题

I'm using Sun's javac 1.6.0_26. I invoke it like this:

javac -Xlint -encoding UTF-8 

and usually if there are errors only them are displayed. However this code

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:

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)?

回答1:

There is a standard option in javac -nowarnwhich disable warning messages. You can get more informations from javac-options

回答2:

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:

@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 might have 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.

来源：https://stackoverflow.com/questions/7777618/javac-show-error-without-warnings