The Java + Spring Boot Blueprint (BLOG 4 — Variables in Java (What They REALLY Are)

Before data types, you must understand variables.

In Blog 3, we understood how Java programs are structured and how execution starts.

Now the next question is:

Where does your program store data?

The answer is:

Variables

What is a Variable (Simple Truth)

A variable is NOT a box.

👉 It’s a label pointing to a memory location.

Visual Understanding

int x = 10;

Stack Memory:

[x → 10]

👉 x is just a name 👉 10 is stored in memory

Common Mistake

“Variable stores value”

👉 Correct:

Variable refers to a location where value is stored

How to Declare a Variable

In Java, every variable must have a type.

Syntax:

dataType variableName = value;

Example:

int age = 25;
double salary = 50000.50;
char grade = 'A';