NOVEL THINKING

Though we can overload the main method, JVM will never call the overloaded main method. When the subclass has the same method of the base class, we call it a method overriding which means that the subclass has overridden the base class method. Runtime polymorphism is a process in which a call to an overridden method is resolved at runtime rather than compile-time. In this example, we have created a class Area that has 2 methods computeArea(int) and computeArea(int, int). Since method invocation is determined by the JVM not compiler, it is known as runtime polymorphism. the class gives its own implementation to an inherited method without even modifying the parent class code. When we pass two integer values to the overloaded method, a sum of two integers is returned and when two Strings are passed the result is the concatenated string. All rights reserved. Here we have an overloaded method sum. April 20, 2014 by javainterviewpoint 5 Comments. Polymorphism in Java is another important feature of OOPs concept. Method Overriding in Java is possible through inheritance only. Whew! Hence it calls method of Cow class since AnimalDemo class extends the Cow class. This is polymorphism. You will be able to understand this concept clearly with the below example. In the second function call, we pass two String type parameters, and hence the second overloaded method is called. is also known as dynamic polymorphism. From the below example, we can clearly understand this difference. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. It is also called method overloading in general. Below is another example of runtime polymorphism where we can use the same object name to create multiple class instances. Polymorphism in Java – Method Overloading and Overriding. Polymorphism in Java with realtime example program code in eclipse : In java polymorphism is a way in which something behaves differently based on its call. For example, if there is an ABC class and class XYZ derived from ABC, the both classes have a polymorphic method func ().

The difference in both the method is one has 1 parameter and the other has 2 parameters even though the method name is the same. Then the child is allowed to redefine that method based on its requirements, this process is called, The parent class method which is overridden is known as an, The child class method which is overriding is known as an, The main purpose of method overriding is that the class give its. We can implement method overloading in two different ways: First, let’s look at an example of method overloading with a different number of parameters. However, the rate of interest may differ according to banks.

The type of this object reference will decide the class methods or functions that should be called. So if we have the following declarations: In this case, the compiler will issue an error as two methods are not overloaded. We are calling the run method by the reference variable of Parent class. Compile-time polymorphism and Runtime polymorphism. Compile-time polymorphism is also known as static polymorphism and the runtime polymorphism is also known as dynamic polymorphism. The below example shows the program that uses method overloading based on the number of parameters. A reference variable can be of only one type. When we call the speed method using object created of instance Bike class(b.speed), it calls the Bike class method. For example, SBI, ICICI, and AXIS banks are providing 8.4%, 7.3%, and 9.7% rate of interest. Or how does the compiler know which method is to be called?

Therefore to understand the concept of method overriding you should have the basic knowledge of. In this tutorial, we will understand in detail about polymorphism and its different types. When we overload a static method, we call it as static polymorphism. About us | Contact us | Advertise | Testing Services All articles are copyrighted and can not be reproduced without permission.

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