Inheritance.pptxci-Net.ci-Netci-Net.ci-Net..ci-Net.

 Inheritance is one of the cornerstones of OOP because it allows for the creation
of hierarchical classifications
 Using inheritance, you can create a general class at the top
 This class may then be inherited by other, more specific classes
 Each of these classes will add only those attributes and behaviors that are unique to it
Inheritance

 In keeping with Java terminology, a class that is inherited is referred to as a superclass
 The class that does the inheriting is referred to as the subclass
 Each instance of a subclass includes all the members of the superclass
 The subclass inherits all the properties of its superclass
Generalization/ Specialization

 These terms are used to signify the relationship between classes
 They are the basic building blocks of OOPS
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Association, Aggregation, Composition

 Association is a relationship between two objects
 The association between objects could be
 one-to-one
 one-to-many
 many-to-one
 many-to-many
 Types of Association
 Aggregation
 Composition
 Example: A Student and a Faculty are having an association
Association

 Aggregation is a special case of association
 A directional association between objects
 When an object ‘has-a’ another object, then you have got an aggregation between
them
 Aggregation is also called a “Has-a” relationship.
 Example: College has a Student Object
Aggregation

Composition
• Composition is a special case of aggregation
• In a more specific manner, a restricted aggregation is called composition
• When an object contains the other object, if the contained object cannot exist without the
existence of container object, then it is called composition
• Example: A class contains students. A student cannot exist without a class. There exists
composition between class and students

 HAS-A relationship is expressed with containership
 Containership simply means using instance variables that refer to other objects
 Example:
 The class House will have an instance variable which refers to a Kitchen object
 It means that, House HAS-A Kitchen
 Note that, something like Kitchen HAS-A House is not valid in this
context
HAS-A relationship

class A{
int money;
private int pocketMoney;
void fill(int money, int pocketMoney)
{
this.money = money;
this.pocketMoney = pocketMoney;
}
public int getPocketMoney(){
return pocketMoney;
}
}
A Possible Solution To The Program

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