Java Programming
☕ Java Programming – Complete Detailed Guide 🔹 Java kya hai? Java ek high-level, object-oriented, secure aur powerful programming language hai. Iska use hota hai: Software applications Android apps Web applications Enterprise systems Banking & large companies ke projects 🔹 Java kyun sikhein? ✔ Platform independent (Write once, run anywhere) ✔ High-paying jobs ✔ Strong demand (MNCs) ✔ Android development ka base 📘 JAVA SYLLABUS (Beginner to Advanced) 1️⃣ Java Basics (Foundation) Aap sikhenge: Java install (JDK) JRE & JVM kya hai First Java program Variables Data types Keywords Comments 📌 Example: class Hello { public static void main(String[] args) { System.out.println(“Hello Java”); } } 2️⃣ Data Types & Variables Types: int float double char boolean 📌 Example: int age = 20; double marks = 85.5; 3️⃣ Operators Arithmetic (+ – * /) Relational (>, <, ==) Logical (&&, ||) Assignment (=) 4️⃣ Control Statements Conditional: if if-else switch 📌 Example: int age = 18; if(age >= 18) { System.out.println(“Eligible”); } 5️⃣ Loops for while do-while 📌 Example: for(int i = 1; i <= 5; i++) { System.out.println(i); } 6️⃣ Arrays Single-dimensional Multi-dimensional 📌 Example: int[] marks = {70, 80, 90}; 7️⃣ Methods (Functions) 📌 Example: static int add(int a, int b) { return a + b; } 8️⃣ Object Oriented Programming (OOP) Core Concepts: Class Object Encapsulation Inheritance Polymorphism Abstraction 📌 Example: class Student { String name; int age; } 9️⃣ Constructors 📌 Example: class Demo { Demo() { System.out.println(“Constructor called”); } } 🔟 Inheritance 📌 Example: class A { int x = 10; } class B extends A { int y = 20; } 1️⃣1️⃣ Interfaces & Abstract Class 📌 Interface: interface Test { void show(); } 1️⃣2️⃣ Exception Handling 📌 Example: try { int x = 10/0; } catch(Exception e) { System.out.println(“Error”); } 1️⃣3️⃣ Packages Built-in User-defined 1️⃣4️⃣ File Handling File FileReader FileWriter 1️⃣5️⃣ Multithreading Thread class Runnable interface 1️⃣6️⃣ Collections Framework List (ArrayList) Set (HashSet) Map (HashMap) 📌 Example: ArrayList<String> list = new ArrayList<>(); 1️⃣7️⃣ Database Connectivity (JDBC) Connect Java with MySQL Insert / Update / Delete data 🌐 ADVANCE JAVA PATH ✔ Web Development Servlets JSP Spring Spring Boot ✔ Android Development Java + Android Studio 💼 Career Options Java Developer Software Engineer Android Developer Backend Developer 💰 Salary: ₹30,000 – ₹1,20,000+ per month
