Treat Java warnings differently

Question

I want to ask if there is a way to treat same type of warnings differently. I mean you can choose how to treat every warning (like warning unused, error unchecked cast and so on), but can I tell the compiler to treat one unused warning as error and ignore another (somehow specify where to treat as error and where to ignore it)?

Answer 1

You can use the @SuppressWarnings annotation. The warnings that can be suppressed are listed here: What is the list of valid @SuppressWarnings warning names in Java?

Answer 2

You have two options:

• Explicitly suppress warnings by adding a directive in each file
• Instruct the compiler to suppress warnings for all files

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The @SuppressWarnings annotation allows you to suppress a warning, and can be applied to most Java blocks. Most IDEs will create a @SuppressWarnings annotation for you, as one of the hint options when a warning occurs.

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man javac describes the -Xlint command line parameter.

There's a long list of options, for example if you want to disable the "raw types" warning:

javac -Xlint:-rawtypes ...

Most IDEs and build systems provide ways of passing parameters to javac -- check the documentation for yours.