Polymorphism (The Java. This principle can also be applied to object- oriented programming and languages like the Java language. Subclasses of a class can define their own unique behaviors and yet share some of the same functionality of the parent class. Polymorphism can be demonstrated with a minor modification to the Bicycle class. For example, a print. Description method could be added to the class that displays all the data currently stored in an instance. For Mountain. Bike, add a field for suspension, which is a String value that indicates if the bike has a front shock absorber, Front. Or, the bike has a front and back shock absorber, Dual. Here is the updated class. Mountain. Bike extends Bicycle . In addition to the information provided before, additional data about the suspension is included to the output. Next, create the Road. Bike class. Because road or racing bikes have skinny tires, add an attribute to track the tire width. Here is the Road. Bike class. public class Road. Bike extends Bicycle. This time, information about the tire width is displayed. To summarize, there are three classes: Bicycle, Mountain. Bike, and Road. Bike. The two subclasses override the print. Description method and print unique information. Here is a test program that creates three Bicycle variables. Each variable is assigned to one of the three bicycle classes. Each variable is then printed. Main difference between static and dynamic binding is that static binding occurs. Here is an example of static binding in java. This Blog will introduce you with the Java Programming. Polymorphism with example. It does not call the method that is defined by the variable's type. This behavior is referred to as virtual method invocation and demonstrates an aspect of the important polymorphism features in the Java language.
Dynamic Polymorphism in Java. Polymorphism is an important feature of object oriented programming. In this tutorial we discuss meaning one of the type of polymorphism, that is dynamic polymorphism and its implemented in Java as a programming language. Our tutorial comprises of three parts mainly: Description of polymorphism briefly. Second part explains dynamic polymorphism and how it can be achieved. Discuss program written in Java that implements the dynamic polymorphism. Polymorphism. It is one of the important features of object oriented paradigm. In static polymorphism. Pretty cool article, good and easy to understand code examples. Static And Dynamic Polymorphism. How to achieve Dynamic or Static polymorphism in Java? Code: /*Method Overloading*/ class Example Polymorphism means one name and many forms. In computer science we refer polymorphism as a capability of a method to have multiple definitions. It allows you to define multiple methods with the same name but various definitions. In OOP there are two types of polymorphism depending upon how method call is resolved: Static polymorphism. Dynamic polymorphism. In this article we will be discussing dynamic polymorphism and its implementation. Dynamic polymorphism. What is dynamic polymorphism? Dynamic polymorphism is also called as the run time polymorphism. As we mentioned earlier while defining polymorphism that polymorphism means there are multiple definitions of a single method. That means a method with same name is defined multiple times in a program. In dynamic polymorphism, if we make a call to such a multiple times defined method in our code then which definition of that method is to be called actually and executed is resolved at run time only. This method binding if is done at runtime by runtime environment then we say dynamic polymorphism is being implemented in the program. Dynamic polymorphism is achieved by a concept called as method overriding in OOP languages like C++ and Java. Method overriding is redefining the same method again and again in the derived classes in an inheritance hierarchy of the classes. In next section we discuss in detail themeaning of the term method overriding that is responsible for the behaviour of dynamic polymorphism. And then we further discuss how the code should be written to actually make this method overriding work properly. Method overriding. Method overriding is a technique to implement dynamic polymorphism in OOP languages in C++ and Java. Method overridingsimply means is to define a method with same name and signature in the base class as well as in the derived class. That means you define a method in the base class. Then you redefine the same method in the derived class also then we call that the method is overridden by the derived class. Here we must first understand what we mean by same method. When we define a method it has three parts return type, name and arguments type. For example: Then for this method: int - return typeadd - name of the methodint, int - argument passed. Now if we define such a method in base class and then also in the derived class exactly the same but keeping the implementation different. Then we say that add method is an overridden method with respect to those classes. Implementation of Dynamic polymorphism using method overriding. In this section we discuss an example of Java to explain the method overriding. Example: Consider a class hierarchy as follows: Base class is named as base. There are two derived classes as derived. Now suppose we want to have the display method in the all three classes then we will write the following code. Note the return type. Note the return type. Note the return type. Now the same method is defined there in the derived class derived. Similarly the same method is defined in the derived class derived. So the method which is defined in the base class is redefined in the derived classes derived. Hence here we can say that the method display() which is originally defined in the base class is overridden in the derived classes of the base class. Hence display is an overridden method and will exhibit the behaviour of the dynamic polymorphism. We also create a new object of base class and assign the created base class object to the objbase object. In line 3, we call the method display with object objbase. Here in line 3 the method of base class will be called. But this is because the object actually created by new in line 1 is of base class. Now in line 4, we create a new object of class derived. But note that the created object is assigned to the objbase which is of type base class and not of derived. In this case when we call the method display in line 6, then the method of base class is not called but the method of derived. This is the magic of the dynamic polymorphism. Similarly at line 8 we create and assign the object of derived. In this caseat line no. So how does this all happen? This is where the concept of dynamic polymorphism plays a role. At compile time such calls are not resolved. These method calls are resolved at the time of program execution. At the time of program execution, the runtime environment checks that the object actually created is that of the derived. At line number 6 when display is called objbase is actually having the object of derived. Runtime environment resolves the method calling to the class of which the actual object is being created. So the display method call is resolved to calling the method of derived. Similarly, at line number 8, the same object objbase is assigned the object of class derived. Then in this case againthe method display call at line number 9 will not be resolved to base class method. But the display method of derived. So what is the final crux now? We must remember that we can create and assign the object of derived class to the variable of type base class. This is completely allowed. That is what we did in lines 4and 8. Now when we call a method on the base class object, the runtime checks the actual object that is being assigned to the base class object. The method of the class whose object is actually created is called and not the method of the class whose object is defined. That is the meaning of dynamic polymorphism. We must understand here how the behaviour of the object is changing at the runtime. How method call is diverted to the method call of another classes using a single object. Here is one important point. What if we do not define the method display in the derived. Now here at line number 1, the objbase is of type base but the object created at the right hand side is of the derived. At line number 2 display method is called. Now we say that display method is not overridden in the derived. Then what will be the behaviour of line 2. In that case the display method of the base class will be called. So in nutshell, we can say that if the method is redefined in the derived class, then the method of derived class is called. Otherwise the derived class inherits the method from the base class and the method of base class is called.
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