Method Overriding Definition:

The state of overriding lets a subclass or child class specify a specific implementation function that is already sent by one of its super classes or parent classes in any object-oriented programming language. When a subclass’s method has a similar name, value, area, or sign, and return type(or sub-type) as a method in its superclass, the subclass’s method is said to override the super-method class’s.

One way that Java gets Runtime Polymorphism is by method overriding. However, the child class’s version is used when a method is applied using an object from a subclass. In other words, the version of an overridden method that gets performed is determined by the type of the object being referenced to, not the type of the reference variable.

Overriding method rules are as given below:

• Overriding: An overriding method’s access modifier can grant more, but not less, access than the overridden method. A protected instance method in the superclass, for example, can be made public in the subclass but not private. This will cause a compile-time error.
• Final methods cannot be overridden: We declare a method as final if we do not want it to be overridden.
• Private methods: These methods cannot be overridden since they are bonded at build time. We can’t even override secret methods in a subclass as a result.
• The return type (or subtype) of the overriding method must match: Since Java 5.0, The return type of a child class’s overriding method can be many, but it must be a subtype of the parent’s return type. Covariant return type describes this phenomenon.
• Invoking an overridden method from a subclass: The super keyword can be used to apply the parent class method in an overriding practice.

To avoid a compile-time error, derived concrete classes must override abstract methods in an interface or abstract class.

Overriding and synchronized/strictfp methods: 

The availability of a synchronized/strictfp modifier with a technique has no influence on the overriding rules, which means a synchronized/strictfp technique can override a non-synchronized/strictfp method and vice versa.

Overridden methods enable Java to provide polymorphism at runtime, as previously indicated. Polymorphism is important in object-oriented programming because it allows a generic class to declare methods that will be shared by all of its descendants while allowing subclasses to define the specific implementation of any or all of those methods. Java states the “one interface, various methods” element of polymorphism in various ways.

Methodology Dynamic Object-oriented design’s dispatch mechanism is one of the most powerful code reuse and robustness techniques. The method to use existing code libraries to call methods on new class instances without recompiling while keeping a clean abstract interface is a tremendously valuable feature.