🟢 Foundation · Lesson 05

Variables in Java

What is a Variable?

A variable is a named container that stores a value in memory. In Java every variable must have a type.

int age = 18;
String name = "Aman";
double price = 99.5;

Types of Variables

Type	Where Declared
Local	inside a method, used only there
Instance	inside a class, one per object
Static	shared by all objects (uses `static`)

Example

public class Demo {
    static int count = 0;   // static
    int id;                 // instance
    void show() {
        int local = 5;      // local
        System.out.println(local);
    }
}

Summary

A variable stores a typed value.
Local (in method), instance (per object), static (shared).

Variable क्या है?

Variable एक named container है जो memory में value रखता है। Java में हर variable का एक type होना ज़रूरी है।

int age = 18;
String name = "Aman";
double price = 99.5;

Variables के प्रकार

Type	कहाँ declare
Local	method के अंदर, सिर्फ वहीं
Instance	class के अंदर, हर object का एक
Static	सभी objects में साझा (`static`)

Example

public class Demo {
    static int count = 0;   // static
    int id;                 // instance
    void show() {
        int local = 5;      // local
        System.out.println(local);
    }
}

सारांश

Variable typed value रखता है।
Local (method में), instance (हर object), static (साझा)।

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