![]() ![]() Now you will learn how to create your own methods with or without return values, invoke a method with or without parameters, and apply method abstraction in the program design. ![]() Instead, a derived class that implements the pure-virtual method (s) must be used. In this example, we are using height as a virtual function. When a pure virtual method exists, the class is 'abstract' and can not be instantiated on its own. When we override a method such as height we want calls to this to refer to the overriden method. println() method, for example, the system actually executes several statements in order to display a message on the console. A pure virtual function or pure virtual method is a virtual function that is required to be implemented by a derived class if the derived class is not abstract. ![]() When the programmers switch the technology from C++ to Java, they think about where is the virtual function in Java. For a virtual method, the base class provides a default. A Java method is a collection of statements that are grouped together to perform an operation. A virtual function or virtual method in an OOP language is a function or method used to override the behavior of the function in an inherited class with the same signature to achieve the polymorphism. An instance method in a subclass with the same signature (name, plus the number and the type of its parameters) and return type as an instance method in the superclass overrides the superclasss method. The shared interface is defined by declaring one or more methods to be virtual or pure virtual. ![]()
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