![]() ![]() ![]() Dm: Cannot use reflection to check for presence of annotation without runtime retention. To get our feet wet, well look at a very basic example that inspects the fields of a simple Java object at runtime. Java does all it can to make sure you didn't make any mistakes at edit/compile time, this is a virtually free way to solve an entire class of mistakes that aren't preventable in any other way outside of comprehensive testing.Ĭould you come up with a better mechanism in Java to ensure that when the user intended to override a method, he actually did?Īnother neat effect is that if you don't provide the annotation it will warn you at compile time that you accidentally overrode a parent method-something that could be significant if you didn't intend to do it. To correctly override the equals() method in java.lang. It is a good idea to use it still, though. Since: 3.0.5 COPYABLEFIELDS public static final ReflectionUtils.FieldFilter COPYABLEFIELDS Pre-built FieldFilter that matches all non-static, non-final fields. The Override annotation is not necessary in order to override a method in a superclass. Pre-built ReflectionUtils.MethodFilter that matches all non-bridge non-synthetic methods which are not declared on. If the method does not match a method in the superclass, the compiler will give you an error. Think about it this way: In the time you navigated here and typed this post, you pretty much used more time than you will spend typing for the rest of your life but one error it prevents can save you hours. The Override Java annotation is used above methods that override methods in a superclass. ![]() It doesn't cost you anything to type but the savings can be immense if you misspelled a method name or got the signature slightly wrong. There is no overkill when you are coding. For classes youll either need a third-party library or write a fair bit of code. There are many good answers here, so let me offer another way to look at it. Overview The class provides APIs to access information about a methods modifiers, return type, parameters, annotations, and thrown exceptions. ![]()
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