java basic oops concept

JAVA

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OOPS

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OOPS

▪ Class

▪ Object

▪ Abstraction

▪ Inheritance

▪ Interface

▪ Encapsulation

▪ Polymorphism

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Identity

State

Behavior

Class

▪ Class is logical entity

▪ Class contain set of objects or collection of objects

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Objects

▪ Objects are real time entity

▪ Identify the object by its ▪ Identity

▪ State

▪ Behavior

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Abstraction

▪ The general meaning for abstraction is ELIMINATION i.e fetching only the wanted information even though all information is available based on our need we are eliminating the unwanted information.

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Inheritance

▪ When one Class extends another Class. Deriving new class from the existing class parent child relationship

Two types

▪ Single level

▪ Multi level

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Cont..

Single level

Deriving a new class from the existing class(one to one)

Example

class A

{

}

class B extends class A

{

}

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Cont..

Multi Level

Deriving multilevel of new class from the parent

Example

class A{

}

class B extends class A {

}

class C extends class B{

}

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Interface

▪ Replacement of multiple inheritance that has methods and method definition and no implementation

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Polymorphism

▪ The general meaning for POLY — many MORPHISM — behavior. Two types of polymorphism.

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Encapsulation

▪ Encapsulation is a process of wrapping code and data together into a single unit e.g. capsule i.e mixed of several medicines.

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