Inheritance jussi pohjolainen tamk university of applied sciences slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. When several classes inherit from is hierarchical inheritance. This is a mixture of two or more inheritance and in this inheritance a code may contains two or three types of inheritance in single code. In this series of lectures,we will focus on inheritance and polymorphism. In hierarchical inheritance, we have 1 parent class and multiple child classes, as shown in the pictorial representation given on this page, inheritance. An important feature of inheritance is to know which member of the base class will be acquired by the derived class. It enhances the concept of reuseability of code as the code once written can be reused and other features can also be added. It allows software developers to derive a new class from the existing class. Answer the questions i to iv based on the following. It means if class a is extended by class b and then further class c extends class b then the whole structure is termed as multilevel inheritance. To use keyword extendsto create a class that inherits attributes and behaviors from another class. Inheritance enables you to create new classes that reuse, extend, and modify the behavior defined in other classes. Single inheritance only one super class multiple inheritance several super classes hierarchical inheritance one super class, many sub classes. The class which inherits the properties of another class is called derived or child or sub class and the class whose properties are inherited is called base or parent or super class.
These notes do not examine protected and private inheritance. Inheritance, together with encapsulation and polymorphism, is one of the three primary characteristics of objectoriented programming. Hybrid inheritance in c with example programs pdf download. Inheritance is the method by which the features of a existing class can be used with new class. For example, a child and parent class relationship that follows multiple and hierarchical inheritance both can be called hybrid inheritance. Consider a simple example of hierarchical inheritance. This course is about explaining the path from java to executing programs. Structured programming language object oriented programming language difference between structured and object oriented programming language. Hierarchical inheritance when the properties of one class are inherited by more than one class, it is called hierarchical inheritance. Note that this inheritance hierarchy could con tain many other. In this type of inheritance, more than one sub class is inherited from a single base class.
It is a mix of two or more of the above types of inheritance. Single, multilevel, multiple inheritances we will dicuss about the 4th type of inheritance i. While using different type of inheritance, following rules are applied. And in turn each of the derived classes can further be inherited in the same way. Most information is made manageable by hierarchical. Java, ruby, and smalltalk, but each language implements it in its own way.
The type of inheritance is specified by the accessspecifier as explained above. More than one class inherits the traits of one class. Java notes achin jain assistant professor, cseniec java notes by achin jain 1 inheritance inheritance is the mechanism of deriving new class from old one, old class is knows as superclass and new class is known as subclass. In java, we can achieve hybrid inheritance only through interfaces. If you continue browsing the site, you agree to the use of cookies on this website. In this type of inheritance, more than one sub class is. Multilevel inheritance it is a ladder or hierarchy of single level inheritance. A derived class with only one base class is called single. Perimeter class is derived from base class rectangle. One of the main uses of inheritance is to model hierarchical structures that exist in the world. Inheritance and hierarchical organization capture idea. The class which inherits the properties of another class is called derived or child or sub class and the class whose properties are inherited is.
Hybrid inheritance is a combination of more than one type of inheritance. Once a class has been written and tested, it can be adapted by another programmer to suit their requirements. We hardly use protected or private inheritance, but public inheritance is commonly used. Inheritance and class hierarchies city university of new. When you inherit from an existing class, you can reuse methods and fields of the parent class. The friend functions and friend classes of the base class are not inherited.
When a subclass is the base class the same class it of another. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Inheritance hierarchies by defining a class that is based on another class, using inheritance, one class is a specialization of another. Research paper a study on inheritance using object. Simple inheritance, protecting data, virtual function, pointer and inheritance, multiple inheritance. Other programming languages, such as java, refer to the base class as the superclass and. Recombinant dna technology webnote, pdf, ppt, doc, animation. Those whove taken cs106x recently were taught this material, but cs106b skipped over it, and because the chapter is. Hierarchical and hybrid inheritance differences types. Constructor of a class constructor of c class 5 hybrid inheritance. Inheritance of mitochondrial and chloroplast genes, maternal inheritance. Inheritance supports reusability of code and is able to simulate the transitive nature of real life objects. Class hierarchy, derived classes, single inheritance, multiple, multilevel. Java technologiesi core java cdac notes, java technologiesii.
Introduction the inheritance allows subclasses to inherit all properties variables and methods of their parent classes. Lecturing notes, assignment, reference, wiki description explanation, brief detail. Thus it forms hierarchy of classes or a tree of classes which is rooted at single class. The derived class inherits the features of the base class existing class. In such kind of inheritance one class is inherited by many sub classes. In the class hierarchy some of the data members are unused so the memory allocated to them remain unutilized which affects the performance of our program. A derived class doesnt inherit access to private data members. Inheritance and class hierarchies 2 chapter outline. In inheritance the base class and child class are tightly coupled so if the base class is modified then it will affect all the child classes.
For creating a subclass which is inherited from the. Inheritance is one of the core feature of an objectoriented programming language. Read more at hierarchical inheritance in java with example program. It is an important part of oops object oriented programming system the idea behind inheritance in java is that you can create new classes that are built upon existing classes. Hierarchical inheritance is that in which a base class has many sub classes or when a base class is used or inherited by many sub classes. One example could be classification of accounts in a commercial bank or classification of students in a. Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of a parent object. Inheritance is the capability of one class to inherit the properties of another class. Inheritance is the process of inheriting properties of objects of one class by objects of another class. Familiarization with computer and the environment and execution of sample programs. In below example class b, c and d inherits the same class a. It is the process of deriving two or more classes from single base class.
1343 992 80 830 1355 205 1329 1277 473 547 1566 918 511 854 665 42 391 1227 993 216 1085 698 617 1309 1219 1377 1161 308 791 157