In the last tutorial we discussed Polymorphism in Java. In this guide we will see types of polymorphism. There are two types of polymorphism in java: 1 Static Polymorphism also known as compile time polymorphism 2 Dynamic Polymorphism also known as runtime polymorphism.
What is polymorphism in programming?
Polymorphism that is resolved during compiler time is known as static polymorphism. Method overloading is an example of compile time polymorphism. Method Overloading : This allows us to have more than one method having the same name, if the parameters of methods are different in number, sequence and data types of parameters.
Method overloading is one of the way java supports static polymorphism. Here we have two definitions of the same method add which add method would be called is determined by the parameter list at the compile time.
That is the reason this is also known as compile time polymorphism. It is also known as Dynamic Method Dispatch. Dynamic polymorphism is a process in which a call to an overridden method is resolved at runtime, thats why it is called runtime polymorphism. I have already discussed method overriding in detail in a separate tutorial, refer it: Method Overriding in Java.
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The child class is overriding the method myMethod of parent class. In this example we have child class object assigned to the parent class reference so in order to determine which method would be called, the type of the object would be determined at run-time.
It is the type of object that determines which version of the method would be called not the type of reference. To understand the concept of overriding, you should have the basic knowledge of inheritance in Java. When an overridden method is called through a reference of parent class, then type of the object determines which method is to be executed.
Thus, this determination is made at run time.
Since both the classes, child class and parent class have the same method animalSound. Which version of the method child class or parent class will be called is determined at runtime by JVM.
Example 1: Polymorphism in Java
In the third case the method of child class is to be executed because which method is to be executed is determined by the type of object and since the object belongs to the child class, the child class version of myMethod is called. There will be no compile time error It can be called as A.
Yes , it will overload. I dont think built in is the right phrase. Ex wait , notify , equals , etc.
Compile time Polymorphism (or Static polymorphism)
May i know what is runtime polymorphism? Dynamic run time polymorphism is the polymorphism existed at run-time. Here, Java compiler does not understand which method is called at compilation time. Only JVM decides which method is called at run-time. Method overloading and method overriding using instance methods are the examples for dynamic polymorphism.
Your email address will not be published. There are two types of polymorphism in java: 1 Static Polymorphism also known as compile time polymorphism 2 Dynamic Polymorphism also known as runtime polymorphism Compile time Polymorphism or Static polymorphism Polymorphism that is resolved during compiler time is known as static polymorphism.
Yes of course! The method overriding is an example of runtime polymorphism.
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