Method overriding is used to achieve the runtime polymorphism or dynamic binding. The run-time polymorphism is also called dynamic polymorphism or late binding. The type of polymorphism which is implemented dynamically when a program being executed is called as run-time polymorphism. The methods are invoked or called with the same type and number of parameters used. Here the method do() is overloaded 3 times: first having one int parameter, second one has 2 int parameters and third one is having double arg. In the following program, both number of argument and data type is to be changed. Sometimes we may need to use the method which is having the different number of argument and different data type. Method Overloading by changing both number of argument and data type: The first add1() method receives two integer arguments and second add1() method receives two double arguments. In the following program, we have created two methods that differs in data type. Sometime there is need to use the same method which is having different data type. Method Overloading by changing the data type: In following example, we are creating static methods so that we don’t need to create instance for calling methods. In the following program, two methods are created, first add1() performs addition of two numbers and second add1() performs addition of three numbers. Suppose you have to perform addition of the given numbers but there can be any number of arguments, if you write the method such as x(int,int) for two parameters, and y(int,int,int) for three parameters then it may be difficult for you as well as other programmers to understand the behavior of the method because its name differs. Method overloading by changing number of argument: By changing both number of arguments and data typeĪ.There are three ways to overload the method in java If we must perform only one operation, having same name of the methods increases the readability of the program. Method overloading is performed within class. If a class has multiple methods having same name but different in parameters, it is known as Method Overloading. This type of polymorphism is also called as static polymorphism or early binding. The type of polymorphism that is implemented when the compiler compiles a program is called compile-time polymorphism. Method overloading is an example of compile time polymorphism, while method overriding is an example of runtime polymorphism. There are two types of polymorphism in Java:ġ) Compile-time polymorphism (static binding)Ģ) Runtime polymorphism (dynamic binding) This allows multiple objects of different subclasses to be treated as objects of a single parent class, while automatically selecting the proper methods to apply to an object based on the child class it belongs. JAVA is object-oriented programming language which support the concept of polymorphisms.Īlternatively, it is defined as the ability of a reference variable to change behavior according to what object instance it is holding. It is one of the important concept of object-oriented programming language. Polymorphism is the ability of an object to take more than one forms.

Overriding vs polymorphism java