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servlets servlets // Javadoc comment follows /** * @deprecated * explanation of why it was deprecated */ static void deprecatedMethod() { } } —the annotation informs the compiler that the element is meant to override an element declared in a superclass (overriding methods will be discussed in the the lesson titled "Interfaces and Inheritance"). // // int overriddenMethod() { } While it's not required to use this annotation when overriding a method, it helps to prevent errors. If a method marked with fails to correctly override a method in one of its superclasses, the compiler generates an error. —the annotation tells the compiler to suppress specific warnings that it would otherwise generate. In the example below, a deprecated method is used and the compiler would normally generate a warning.

servlets In this case, however, the annotation causes the warning to be suppressed. // // void useDeprecatedMethod() { objectOne.deprecatedMethod(); //deprecation warning - suppressed } Every compiler warning belongs to a category. The Java Language Specification lists two categories: "deprecation" and "unchecked." The "unchecked" warning can occur when interfacing with legacy code written before the advent of generics (discussed in the lesson titled "Generics").

servlets To suppress more than one category of warnings, use the following syntax: @SuppressWarnings({"unchecked", "deprecation"}) The more advanced uses of annotations include writing an that can read a Java program and take actions based on its annotations. It might, for example, generate auxiliary source code, relieving the programmer of having to create boilerplate code that always follows predictable patterns. To facilitate this task, release 5.0 of the JDK includes an annotation processing tool, called . In release 6 of the JDK, the functionality of is a standard part of the Java compiler.

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