Java Variables Full Guide In Hindi ~ Search How

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Hello friends welcome to my blog, friends hum aapko bta de ki humne apni peechli post main seekha tha Java Data Types ke bare main or dosto ab hum seekhenge Java Variables ke bare main, aayiye dosto ab hum seekhte hain.

Introduction To Java Variables

Friends agar hume koi bhi information ko store karna hota hai to hum uske liye variables ka use karte hain or dosto hum apni us information ko variable ki value bhi kehte hain.

Friends agar hum chahe to variable ki value change bhi kar sakte hain hum kabhi bhi apni pehli value ki jagah dusri value store kar sakte hain, dosto ab hum aapko batana chahte hain ki hum jis variable ki value ko change nahi kar pate ya us variable ki value change nhi ki ja sakti use hum consonants kehte hain.

Friends jab hum koi information store karte hain to hume usse pehle variable create karna hota hai, dosto ab hum aapko batate hain variable create kaise karte hain. dosto variable create karne ke liye hume variable ka name dena hota hai, dosto variable ka name soch samajh kar hi accha sa rakhe jisso read karne main aasani ho, variable ka name unique hona chahiye dosto agar hum esa nahi karte to compiler error generate karega, dosto ek baat or hum aapko batana chahte hain dosto variable ke name se pehle hume datatype bhi define karna hoga.

Friends agar hum baat kare data type ki to isko hum information type ke name se jante hain  or iska matlab hota hai ki hume kis trah ki information store karni hai, for example ==> hum koi number store karna chahte hain ya koi bhi word store karna chahte hain. dosto variable ke name se pele hum konse number store karna chahte hain ye hume define karna jaruri hota hai or dosto isiko hum data type kehte hain.

Variable Types

Friends agar hum baat kare java variables ki to java main variables ko unke scope ke according baanta gaya hai or ye 2 types ke hote hain.

• Local Variables
• Global Variables

Local Variables
Friends hum sabse pehle baat karte hain local variables ki to dosto sabse pehle hum aapko bta de ki  jab hum kisi method main koi variable create karte hain to us variable ka use us method tak hi rehta hai. or us method ke bahar us method ka koi use nahi hota hai or isko hi variable ka scope kehte hain. dosto jin bhi variable ka scope kisi bhi method tak hi hota hai to unhe local variables bolte hain.


Global Variables
Friends ab hum baat karte hain global variables ki to hum aapko bta de ki jab hum koi variable pure program main use karte hain to usko kisi method main declare nahi karte hain, dosto hum aapko bta de ki aise jo variables hote hain unko program ke starting main hi declare karte hain or inko hum program main kahi bhi use kar sakte hain, global variables ka scope pure program main hota hai. dosto ese variables jinko pure ke pure program main kahi use kiya ja sake unko hi hum global variables bolte hain.

CreateVariables In Java

Friends java main variables create karne ki 2 stages hoti hain.

• Variable Declaration
• Variable Initialization

Variable Declaration
Friends hum baat karte hain variable declaration ki to dosto is stage main hum bas variable ka name or vo kis trah ki values store kar raha hai ye define karte hain. for example ==> int personAge; // data type variable name


Variable Initialization
Friends hum ab baat karte hain variable initialization ki to dosto is stage main hum variable ki value define karte hain. for example ==> int personAge = 26;
Dosto hum aapko batana chahte hain ki agar hum chahe ki humare variable ki value run time main user se input karwaye to hum variable ko initialize nahi karte hain usko bas declare karke hume use chhod dena hai.

Input From User

Friends ab hum karte hain user se input lene ke bare main to dosto jab hume run time main variable main value input karwani hoti hai to hum uske liye scanner class ka object create karte hain, ye class kayi trah ke method provide karti hai jo keyboard se input lene ke liye use kiye jate hain, dosto har trah ke daya type ke liye different different methods provide kiye gaye hain,

Dosto jab hum object create karte hain to argument System.in pass karwate hain, dosto System.in ka matlab hota hai jo user keyboard main type kare vo hum lena chahte hain, value read karne ke liye hum is object par different different methods use kar sakte hain for example integer value read karne ke liye nextInt(), string ke liye nextLine() or float value read karne ke liye nextFloat() etc methods call kar sakte hain.

int PersonAge; // variable declaration
Scanner s = new Scanner(System.in); // Scanner class object
PersonAge = s.nextInt(); // reading from keyboard

Final Words

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