Method Overloading And Method Overriding In Java With Realtime Examples
In this Java tutorial, we will study one of the most important concepts in object-oriented programming language. This concept is known as method overloading and method overriding. We will discuss both these concepts with examples so that you can easily understand them.
Java allows you to have multiple methods with the same name but different parameters. This is called method overloading.
Method overloading is used to provide different implementations of methods with the same name but different parameters. It’s possible because Java will figure out which method you want based on its signature (the number and type of arguments).
Method overriding is the process of defining a new method of the same name and signature as an existing method. It allows you to change the behavior of an existing method in order for it to be customized for your own use case.
The overriding method must be declared as public or protected, otherwise it will not override any other methods, but rather create a new one that doesn’t exist before. The overriding method must also have all its parameters (including their types) match with those defined by its parent class’ original version; otherwise it won’t work properly when calling out to this new version from within your application codebase.
What are the differences between method overloading and method overriding?
Method overriding is a special type of method overloading. It’s used to replace the implementation of a method in a subclass, provide new functionality in a subclass and change the behavior of a method in a subclass.
Method overriding is not allowed if:
- The signature of the overriding method has different argument types than its base class counterpart (i.e., non-reifiable types)
- The return type doesn’t match exactly or is more specific than that of base class implementation
When should you use method overloading?
You should use method overloading when you want to provide different implementations for the same method name.
You should use method overloading when you want to change the behavior of a method for a specific type. For example, if you have an Employee class and want each employee to be able to get his/her id or salary based on the employee’s name and salary respectively then you could do this by overloading getId() and getSalary().
You should also use overloading when you want to change the behavior of a method depending on what object it is called upon (this is called polymorphism).
When should you use method overriding?
- You want to change the behavior of a method. For example, if you have a class that represents an employee and all employees have an identify() method, then you may want to override this method so that it prints out the employee’s name instead of just returning their ID number.
- You want to override the behavior of a method because its default implementation does not suit your needs or requirements. For example, let’s say we want our Employee class from above (which had two overloaded versions) but we also want our employees’ names printed out when they’re identified by their ID numbers instead of just seeing an integer value returned by each call to “identify()”. This can easily be done by creating another version of this method and implementing it inside our new class file:
Method Overloading and Method Overriding are two different types of methods that can be defined in a class. Both the methods have same name but they differ in their parameter lists and return type.
Method overriding is used when you want to override the functionality of existing method with new functionality, whereas method overloading adds additional functionality to an existing method without changing its existing behavior.
Method overloading and method overriding are two different concepts that you can use in your Java code. Method overloading is used when there are multiple methods with the same name but different parameters, whereas method overriding is used when a subclass has a method with the same signature as its parent class. Understanding these differences will help you write better code!