The @Override Annotation in Java
The @Override annotation is a standard Java annotation that was first introduced in Java 1.5. The @Override annotation denotes that the child class method overrides the base class method.
For two reasons, the @Override annotation is useful.
- If the annotated method does not actually override anything, the compiler issues a warning.
- It can help to make the source code more readable.
Why we use @Override annotation:
Because of the following two advantages, using the @Override annotation when overriding a method is considered a best practice for coding in Java:
1) You’ll get a compile-time error if the programmer makes a mistake while overriding, such as using the wrong method name or parameter types. Because you are informing the compiler that you are overriding this method by using this annotation. If you don’t use the annotation, the sub-class method will be treated as a new method in the subclass (rather than the overriding method).
2) It improves the code’s readability. If you change the signature of an overridden method, all sub-classes that override it will throw a compilation error, which will eventually lead to you changing the signature in the subclasses. If you have a large number of classes in your application, this annotation will greatly assist you in identifying the classes that need to be changed when a method’s signature is changed.
public @interface Override
Example 1: Without usage of abstract class
Example 2: Using the abstract class
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