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โšก Variables & Data Types in Java โญ

After understanding Java basics, the next important concept is Variables and Data Types. Every Java program stores and manipulates data, and this is done using variables. Letโ€™s understand everything step by step.

โœ… 1๏ธโƒฃ What is a Variable?

A variable is a container that stores data. Think of it like a box that holds values.

Example: int age = 25;

Here:
- int โ†’ data type
- age โ†’ variable name
- 25 โ†’ value stored in variable

Simple Structure:
data_type variable_name = value;

Example:
int number = 10;
double salary = 50000.50;
char grade = 'A';


โœ… 2๏ธโƒฃ Rules for Naming Variables

Java has some rules for variable names.

โœ” Must start with letter, _ or $
โœ” Cannot start with a number
โœ” Cannot use Java keywords

Valid examples:
- int age;
- double salary;
- String studentName;

Invalid examples:
- int 1age;
- double student-name;

โœ… 3๏ธโƒฃ Data Types in Java

Java has two main types of data types.

1๏ธโƒฃ Primitive Data Types
2๏ธโƒฃ Non-Primitive Data Types

๐Ÿ”น 4๏ธโƒฃ Primitive Data Types

Primitive types store simple values directly in memory. Java has 8 primitive data types.

- byte: 1 byte (e.g., byte a = 10;)
- short: 2 bytes (e.g., short b = 100;)
- int: 4 bytes (e.g., int age = 25;)
- long: 8 bytes (e.g., long population = 8000000000L;)
- float: 4 bytes (e.g., float price = 12.5f;)
- double: 8 bytes (e.g., double salary = 50000.75;)
- char: 2 bytes (e.g., char grade = 'A';)
- boolean: 1 bit (e.g., boolean isTrue = true;)

๐Ÿ”น 5๏ธโƒฃ Non-Primitive Data Types

Non-primitive types store references to objects.
Examples: String, Arrays, Classes, Objects, Interfaces

Example:
String name = "Java";
int[] numbers = {1, 2, 3, 4};


Difference:
- Primitive: Stores value, fixed size, faster.
- Non-Primitive: Stores reference, dynamic size, slightly slower.

๐Ÿ”น 6๏ธโƒฃ Type Casting

Type casting means converting one data type to another. There are two types.

โญ 1. Implicit Casting (Automatic): Smaller type โ†’ Larger type.
Example:
int number = 10;
double value = number;


โญ 2. Explicit Casting (Manual): Larger type โ†’ Smaller type.
Example:
double price = 99.99;
int value = (int) price; // Output: 99


๐Ÿ”น 7๏ธโƒฃ Constants in Java (final keyword)

A constant is a variable whose value cannot change. Java uses the final keyword.

Example:
final double PI = 3.14159;

Constants are usually written in UPPERCASE.

๐Ÿ”ฅ Example Program (Variables in Java)
class VariablesDemo {
public static void main(String[] args) {
int age = 25;
double salary = 50000.75;
char grade = 'A';
boolean isWorking = true;

System.out.println("Age: " + age);
System.out.println("Salary: " + salary);
System.out.println("Grade: " + grade);
System.out.println("Working: " + isWorking);
}
}


Output:
Age: 25
Salary: 50000.75
Grade: A
Working: true


โญ Common Interview Questions

1๏ธโƒฃ What are the 8 primitive data types in Java?
2๏ธโƒฃ What is the difference between primitive and non-primitive data types?
3๏ธโƒฃ What is type casting in Java?
4๏ธโƒฃ What is the difference between implicit and explicit casting?


๐Ÿ”ฅ Quick Revision

- Variables โ†’ containers for storing data.
- Primitive types: byte, short, int, long, float, double, char, boolean.
- Non-primitive types: String, Arrays, Objects, Classes.
- Type casting: Implicit โ†’ automatic; Explicit โ†’ manual.
- Constant: Created using the final keyword.


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โœ… Coding Interview Acronyms You MUST Know ๐Ÿ’ป๐Ÿ”ฅ

DSA โ†’ Data Structures & Algorithms

CPU โ†’ Central Processing Unit

RAM โ†’ Random Access Memory

DBMS โ†’ Database Management System

RDBMS โ†’ Relational Database Management System

ACID โ†’ Atomicity, Consistency, Isolation, Durability

OLTP โ†’ Online Transaction Processing

OLAP โ†’ Online Analytical Processing

TCP โ†’ Transmission Control Protocol

IP โ†’ Internet Protocol

DNS โ†’ Domain Name System

MVC โ†’ Model View Controller

MVVM โ†’ Model View ViewModel

SDLC โ†’ Software Development Life Cycle

CI/CD โ†’ Continuous Integration / Continuous Deployment

JWT โ†’ JSON Web Token

ORM โ†’ Object Relational Mapping

API โ†’ Application Programming Interface

REST โ†’ Representational State Transfer

SOAP โ†’ Simple Object Access Protocol

Big O โ†’ Time & Space Complexity Notation

FIFO โ†’ First In First Out

LIFO โ†’ Last In First Out


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๐Ÿš€ Understand Any Tech System with One Prompt as a programmer

(Note: System understanding, connecting real-world problems to technical problems, and asking the right questions may become some of the most valuable skills for programmers over the next 5 years. As AI becomes irreplaceable at writing and executing code, programmers need to become better at defining the problem, understanding the system, and judging whether the solution actually works)

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xml
<role>
You are a patient programming teacher.
</role>

<audience>
Explain to a first-year college student.
</audience>

<task>
Teach: [TOPIC]
</task>

<context>
Level: Beginner
Goal: [What I want to build or understand]
Tools: [Available tools]
</context>

<method>
1. Explain simply.
2. Give one real-world example.
3. Show a small code or action example.
4. Explain common mistakes.
5. Give one practice task.
6. Add official learning links.
</method>

<constraints>
Do not invent facts, links, commands, or features.
Separate verified facts from suggestions.
Use short and simple explanations.
</constraints>

<output>
Title:
Why it matters:
Simple explanation:
Example:
Common mistake:
Practice task:
Reliable resources:
</output>
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text
[TOPIC] = How login authentication works
[GOAL] = Build a secure login system
[TOOLS] = Python, FastAPI, PostgreSQL

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1๏ธโƒฃ Jobs and Internships Updates
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1๏ธโƒฃ Jobs and Internships Updates
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