![]() ![]() For the third and fourth methods, there is a change of order of parameters. The compiler looks at the method signature and decides which method to invoke for a particular method call at compile time. The first method takes two parameters while the second one takes three. In the above example, there are four versions of add methods. Now, if we call the overridden method on the superclass reference then the subclass version of the method will be called. Let’s say we create an object of the subclass and assign it to the superclass reference. The polymorphic nature of Java will use the overriding method. Suppose a subclass overrides a particular method of the superclass. Note: It’s also legal to say every object in Java is polymorphic in nature, as each one passes an IS-A test for itself and also for Object class. Method overriding is an example of dynamic polymorphism, while method overloading is an example of static polymorphism. Polymorphism in Java has two types: Runtime polymorphism (dynamic binding) and Compile time polymorphism (static binding). To extend our example, the method feedAnimal() can perform different actions if it’s called on a Cat as opposed to a generic Animal. When a method defined in this subclass overrides its parent’s subclass, Java’s polymorphic nature can enable it to perform the same action (method) in a different way. In fact, any object that satisfies more than one IS-A relationship is polymorphic in nature.Ī subclass inherits the attributes and methods from its superclass (parent). Here, a Cat satisfies the IS-A relationship for its own type, Cat as well as its super class Animal, and is therefore polymorphic. For instance, let’s consider a class Animal and let Cat be a subclass of Animal. Polymorphism occurs when one class is created that extends another one. ![]() When applied to Java (and other object-oriented programming languages), it describes the language’s ability to process objects of various types and classes through one interface.Īn important example of polymorphism is how a parent class refers to a child class object. This kind of polymorphism can be achieved with the help of method overriding (function. Polymorphism means ‘the capacity to take on different forms’. Runtime Polymorphism is often known as Dynamic Method Dispatch. ![]()
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