Method Overriding in Java
If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in Java.
In other words, If a subclass provides the specific implementation of the method that has been declared by one of its parent class, it is known as method overriding.
Usage of Java Method Overriding
Rules for Java Method Overriding
Understanding the problem without method overriding
Let's understand the problem that we may face in the program if we don't use method overriding.Test it Now
Vehicle is running
Problem is that I have to provide a specific implementation of run() method in subclass that is why we use method overriding.
Example of method overriding
In this example, we have defined the run method in the subclass as defined in the parent class but it has some specific implementation. The name and parameter of the method are the same, and there is IS-A relationship between the classes, so there is method overriding.Test it Now
Bike is running safely
A real example of Java Method Overriding
Consider a scenario where Bank is a class that provides functionality to get the rate of interest. However, the rate of interest varies according to banks. For example, SBI, ICICI and AXIS banks could provide 8%, 7%, and 9% rate of interest.
Java method overriding is mostly used in Runtime Polymorphism which we will learn in next pages.Test it Now
Output: SBI Rate of Interest: 8 ICICI Rate of Interest: 7 AXIS Rate of Interest: 9
Can we override static method?
No, a static method cannot be overridden. It can be proved by runtime polymorphism, so we will learn it later.
Why can we not override static method?
It is because the static method is bound with class whereas instance method is bound with an object. Static belongs to the class area, and an instance belongs to the heap area.
Can we override java main method?
No, because the main is a static method.
Difference between method Overloading and Method Overriding in java