So the move() method of Bike class will be called. In this case,the object is of class Bike. So when a call to move() is made, java waits until runtime to check which object is being pointed to by reference. In above example, it should be noted that in the first call to move(),the reference type is Vehicle and the object is being referenced is Bike. Step 3: Third we create a class TestVehicle in which we create an object and call the above class method: class TestVehicle Step 2: Second we create a class Bike which extends the class Vehicle: class Bike extends Vehicle Step 1: First we create a class Vehicle in which we declare a move() method: class Vehicle Let us take an example to show the working of run time polymorphism through method overriding. Program Example of Run time polymorphism: It means if child class provides the specific implementation of the method that has been provided by one of its parent class then it is known as method overriding. Method overriding says child class has the same method as declared in the parent class. Run time or dynamic polymorphism is achieved(implemented) through method overriding. It is also called dynamic or late binding. Java virtual machine determines the proper method to call at the runtime, not at the compile time. You can have a method in subclass that overrides the method in its parent classes with the same name and parameters. Whenever an object is bound with the functionality at run time, this is known as runtime polymorphism. The compiler looks at the method signature and decides which method to call for a particular method call at compile time. In the third method there is change in type of parameters. The first method takes two parameters or arguments while the second one takes three parameters. In above example there are three versions of add methods. Step 2: Second we create a class PrintAdd in which we call the above class methods by creating an object: class PrintAdd Step 1: First we create a class Addition in which we declare three add() methods with different parameters: class Addition Let us take an example to show the working of compile time polymorphism through function overloading. Program Example of Compile time polymorphism: In java we achieve function overloading at run time. Function overloading is one of the way to achieve polymorphism but it depends on technology that which type of polymorphism we adopt. Method Overloading says you can have more than one function with a same name in one class having a different prototype. Implementation of Compile time polymorphism:Ĭompile time polymorphism is achieved through method overloading. So this is called compile time polymorphism or static or early binding. At compile time, java knows which method to call by checking the method signatures. Whenever an object is bound with their functionality at compile time this is known as compile time polymorphism. 4 Polymorphism Important Points To Remember.2 Difference Between Compile Time and Run Time Polymorphism.
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