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EVERYONE JOIN FAST SO THAT YOU ALL WON'T MISS ANY Coding Contest 🔥 𝗧𝗵𝗼𝘀𝗲 𝘄𝗵𝗼 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗽𝗿𝗮𝗰𝘁𝗶𝗰𝗲 𝗰𝗼𝗺𝗽𝗲𝘁𝗶𝘁𝗶𝘃𝗲 𝗽𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗼𝗿 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗽𝗮𝗿𝘁𝗶𝗰𝗶𝗽𝗮𝘁𝗲 𝗶𝗻 𝗰𝗼𝗺𝗽𝗲𝘁𝗶𝘁𝗶𝘃𝗲 𝗽𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗰𝗼𝗻𝘁𝗲𝘀𝘁𝘀 𝗷𝗼𝗶𝗻 𝘁𝗵𝗲𝘀𝗲 𝗯𝗲𝗹𝗼𝘄 𝗴𝗿𝗼𝘂𝗽𝘀👇👇. 𝟭. 𝗚𝗲𝗻𝗲𝗿𝗮𝗹 𝗗𝗶𝘀𝗰𝘂𝘀𝘀𝗶𝗼𝗻 𝗚𝗿𝗼𝘂𝗽: https://t.me/cp_discussion_group https://t.me/allcodingsolution_official 𝟮. 𝗟𝗘𝗘𝗧𝗖𝗢𝗗𝗘 𝗗𝗶𝘀𝗰𝘂𝘀𝘀𝗶𝗼𝗻 𝗚𝗿𝗼𝘂𝗽: https://t.me/leetcode_cp 𝟯. 𝗖𝗢𝗗𝗘𝗙𝗢𝗥𝗖𝗘𝗦 𝗗𝗶𝘀𝗰𝘂𝘀𝘀𝗶𝗼𝗻 𝗚𝗿𝗼𝘂𝗽: https://t.me/codeforces_cp 𝟰. 𝗖𝗢𝗗𝗘𝗖𝗛𝗘𝗙 𝗗𝗶𝘀𝗰𝘂𝘀𝘀𝗶𝗼𝗻 𝗚𝗿𝗼𝘂𝗽: https://t.me/codechef_group 𝟱. 𝗖𝗢𝗗𝗜𝗡𝗚 𝗡𝗜𝗡𝗝𝗔𝗦 𝗗𝗜𝗦𝗖𝗨𝗦𝗦𝗜𝗢𝗡 𝗚𝗿𝗼𝘂𝗽: https://t.me/coding_ninjas_discuss 𝟲. 𝗔𝗧𝗖𝗢𝗗𝗘𝗥 𝗗𝗜𝗦𝗖𝗨𝗦𝗦𝗜𝗢𝗡 𝗚𝗥𝗢𝗨𝗣: https://t.me/atcoder_discuss 𝟳. 𝗡𝗘𝗪𝗧𝗢𝗡 𝗦𝗖𝗛𝗢𝗢𝗟 𝗗𝗜𝗦𝗖𝗨𝗦𝗦𝗜𝗢𝗡 𝗚𝗥𝗢𝗨𝗣: https://t.me/Newton_School_Discuss 𝟴. 𝗞𝗔𝗚𝗚𝗟𝗘 𝗗𝗜𝗦𝗖𝗨𝗦𝗦𝗜𝗢𝗡 𝗚𝗥𝗢𝗨𝗣: https://t.me/kaggle_official 9.Smart India Hackathon: https://t.me/sih_official 10. ICPC Official: https://t.me/icpc_Official 19Sep 3 ⚡ Variables & Data Types in Java ⭐ 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. Let’s understand everything step by step. ✅ 1️⃣ 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 → data type - age → variable name - 25 → value stored in variable Simple Structure: data_type variable_name = value; Example: int number = 10; double salary = 50000.50; char grade = 'A'; ✅ 2️⃣ Rules for Naming Variables Java has some rules for variable names. ✔ Must start with letter, _ or $ ✔ Cannot start with a number ✔ Cannot use Java keywords Valid examples: - int age; - double salary; - String studentName; Invalid examples: - int 1age; - double student-name; ✅ 3️⃣ Data Types in Java Java has two main types of data types. 1️⃣ Primitive Data Types 2️⃣ Non-Primitive Data Types 🔹 4️⃣ 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;) 🔹 5️⃣ 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. 🔹 6️⃣ Type Casting Type casting means converting one data type to another. There are two types. ⭐ 1. Implicit Casting (Automatic): Smaller type → Larger type. Example: int number = 10; double value = number; ⭐ 2. Explicit Casting (Manual): Larger type → Smaller type. Example: double price = 99.99; int value = (int) price; // Output: 99 🔹 7️⃣ 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. 🔥 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 ⭐ Common Interview Questions 1️⃣ What are the 8 primitive data types in Java? 2️⃣ What is the difference between primitive and non-primitive data types? 3️⃣ What is type casting in Java? 4️⃣ What is the difference between implicit and explicit casting? 🔥 Quick Revision - Variables → containers for storing data. - Primitive types: byte, short, int, long, float, double, char, boolean. - Non-primitive types: String, Arrays, Objects, Classes. - Type casting: Implicit → automatic; Explicit → manual. - Constant: Created using the final keyword. Claim your Free $5 Bonus Here: https://bit.ly/3wUxw09 LinkedIn profile 👇 https://www.linkedin.com/in/subarno-roy-3b2251374 Join our WhatsApp Channel 👇 https://whatsapp.com/channel/0029VbAi27y0lwghBe9mE42i WhatsApp Community Link 👇 https://chat.whatsapp.com/HPJDqRr6G1sKQIqfdJF3pL 1️⃣ GROUP FOR PROGRAMMERS🖥 📎 Channel Link: [ https://t.me/realgroupforprogrammer ] 2️⃣ Coding Community 📎 Channel Link: [ https://t.me/Coding_CommunityOfficial ] 3️⃣ Programming Bay 📎 Channel Link: [ https://t.me/programmingbay ] 4️⃣ Data Structures and Algorithms 📎 Channel Link: [ https://t.me/datastructuresandalgoofficial ] 175Aug 30