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The SuppressWarning annotation is used to suppress compiler warnings for the annotated element. Specifically, the unchecked category allows suppression of compiler warnings generated as a result of unchecked type casts.
If you choose to put @SuppressWarnings("rawtypes") at the method level, Eclipse will suppress all raw-types warnings inside that method. If we compile same code without @SuprressWarnings, using javac compiler it will show the following hint: $ javac RawType.
Use of @SuppressWarnings is to suppress or ignore warnings coming from the compiler, i.e., the compiler will ignore warnings if any for that piece of code. 1. @SuppressWarnings("unchecked") public class Calculator { } - Here, it will ignore all unchecked warnings coming from that class.
Adding the @SuppressWarnings({ "resource" }) should remove the warning for a potential resource leak. Adding a list for other ones, it's for Eclipse but they should be fairly similar for reference.
Use the following:
@SuppressWarnings({"unused", "unchecked"})
If you take a look inside the annotation you will see this:
public @interface SuppressWarnings {
String[] value();
}
as you see, the value parameter is an array of Strings... so the parameter in the annotation can be: value1, value2 or value3 where
final String[] value1 = { "a1" };
final String[] value2 = { "a1", "a2" };
final String[] value3 = { "a1", "a2", "a3" };
i.e.:
@SuppressWarnings({"unused"})
@SuppressWarnings({"unused", "javadoc"})
you can oft see something like
@SuppressWarnings("unused")
and this is a particular case allowing one element wit no "{ }"
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