Java Simple Notes

Introduction of java

INTRODUCTIONINTRODUCTION

JAVAJAVA

Java is a interperter and compiler Java is a interperter and compiler languagelanguage

Java is oop’s based languageJava is oop’s based language Java is a simple languageJava is a simple language Java is developed by sun micro systemJava is developed by sun micro system First model of java is introduce in 1992 First model of java is introduce in 1992

with name oak and working model in with name oak and working model in 19951995

DATA TYPE

PERMITIVE NON PERMITIVE

NUMERIC NON-NUMERIC CLASS ARRAY

INTERFACEINTEGER FLOATING POINT BOOLEAN CHARACTER

INT FLOAT DOUBLE SHORT

BYTE

LONG

DATA TYPE

Feature of oop’s Encapsulation Inheritance Polymorphism Abstraction Modularity Type casting Persistence Concurrency Message passing

Encapsulation It is the ability to store the data in hidden

foam. Encapsulation increase the security because the data member and member method function are stored in class. Where class work as container and we need an object to access the member of the class.

polymorphism

It is the ability to take more than one foam.

The word polymorphism is the combination of greek words poly + mor. where ploy means multiple and mor means foams.

CONTROL STRUCTURE

If-else Nested if-else Ladder if-else Switch case Looping:-1. While2. Do while3. For

Class:-

it is a user defined data type.class work as container for it’s member.

Class can contain:-

1.Data member

2.Member method

Syntax:-

Class<class name>

{

Data member

Member method }

Object:-

it is a instance of any class and compulsory to access the member of class.

Syantax:-

Class <class name> <obj.name>=new <classnmae>();

ConstructorConstructor

It is a member method of any class.It is a member method of any class. The name of constructor always similar to The name of constructor always similar to

class name.class name. It’s cannot return a value.It’s cannot return a value. It’s call automatically when we create an It’s call automatically when we create an

object for it’s class.object for it’s class. Parameterizes constructor is possible.Parameterizes constructor is possible. It’s can’t overload.It’s can’t overload.

METHOD OVERLOADINGMETHOD OVERLOADING

It’s define multiple method with same It’s define multiple method with same name.name.

Three rule use:-Three rule use:-1.1. no. of argumentsno. of arguments2.2. Type of argumentsType of arguments3.3. Sequence of argumentsSequence of arguments

INHERITANCEINHERITANCE► It’s increase the reusability of program.It’s increase the reusability of program.► It extends the program of ‘extends’ keyword.It extends the program of ‘extends’ keyword.► Which class provide the service is called ‘Which class provide the service is called ‘super super

classclass’.’.► Which class receive the service is called ‘Which class receive the service is called ‘sub sub

classclass’.’.► Type of inheritanceType of inheritance1.1. Simple or singleSimple or single2.2. MultilevelMultilevel3.3. HierarchicalHierarchical

Name:ashishEmail id:[email protected]

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