Class Media Pdf Abstrtact
In C++, if a class has at least one pure virtual function, then the class becomes abstract. Unlike C++, in Java, a separate keyword abstract is used to make a class abstract.
The video discusses how television “frames” the working class. Media theorists talk about “framing” as the way in which the media present cultural “scripts” that guide the public’s understanding of issues and events. For an overview of framing theory, take a look at the essay “Media Framing and Effective Public Deliberation”. ABSTRACT The purpose of this paper is to highlight the importance of media use in education especially for instructional purpose. This paper outline the theoretical foundations of the application of media to make teaching-learning more effective and efficient. Introduction A medium (plural media) is a channel of communication, derived from the.
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abstractclassShape { // An abstract function (like a pure virtual function in C++) } |
Following are some important observations about abstract classes in Java.
1) Like C++, in Java, an instance of an abstract class cannot be created, we can have references of abstract class type though.
abstractvoidfun(); classDerived extendsBase { voidfun() { System.out.println('Derived fun() called'); } classMain { // Uncommenting the following line will cause compiler error as the // line tries to create an instance of abstract class. Base b = newDerived(); } |
Output:
2) Like C++, an abstract class can contain constructors in Java. And a constructor of abstract class is called when an instance of a inherited class is created. For example, the following is a valid Java program.
abstractclassBase { Base() { System.out.println('Base Constructor Called'); } } Derived() { System.out.println('Derived Constructor Called'); } voidfun() { System.out.println('Derived fun() called'); } classMain { Derived d = newDerived(); } |
Output:
3) In Java, we can have an abstract class without any abstract method. This allows us to create classes that cannot be instantiated, but can only be inherited.
Class Media Pdf Abstract Design
abstractclassBase { voidfun() { System.out.println('Base fun() called'); } publicstaticvoidmain(String args[]) { d.fun(); } |
Output:
Class Media Pdf Abstract Paper
4) Abstract classes can also have final methods (methods that cannot be overridden). For example, the following program compiles and runs fine.
abstractclassBase { finalvoidfun() { System.out.println('Derived fun() called'); } publicstaticvoidmain(String args[]) { b.fun(); } |
Output:
Exercise:
1. Is it possible to create abstract and final class in Java?
2. Is it possible to have an abstract method in a final class?
3. Is it possible to inherit from multiple abstract classes in Java?
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Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.