☕ Java Programming – Complete Detailed Guide

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🔹 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

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🔹 Java kyun sikhein?

✔ Platform independent (Write once, run anywhere)
✔ High-paying jobs
✔ Strong demand (MNCs)
✔ Android development ka base

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📘 JAVA SYLLABUS (Beginner to Advanced)

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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");
    }
}

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2️⃣ Data Types & Variables

Types:

• int
• float
• double
• char
• boolean

📌 Example:

int age = 20;
double marks = 85.5;

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3️⃣ Operators

• Arithmetic (+ – * /)
• Relational (>, <, ==)
• Logical (&&, ||)
• Assignment (=)

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4️⃣ Control Statements

Conditional:

• if
• if-else
• switch

📌 Example:

int age = 18;
if(age >= 18) {
    System.out.println("Eligible");
}

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5️⃣ Loops

• for
• while
• do-while

📌 Example:

for(int i = 1; i <= 5; i++) {
    System.out.println(i);
}

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6️⃣ Arrays

• Single-dimensional
• Multi-dimensional

📌 Example:

int[] marks = {70, 80, 90};

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7️⃣ Methods (Functions)

📌 Example:

static int add(int a, int b) {
    return a + b;
}

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8️⃣ Object Oriented Programming (OOP)

Core Concepts:

• Class
• Object
• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

📌 Example:

class Student {
    String name;
    int age;
}

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9️⃣ Constructors

📌 Example:

class Demo {
    Demo() {
        System.out.println("Constructor called");
    }
}

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🔟 Inheritance

📌 Example:

class A {
    int x = 10;
}

class B extends A {
    int y = 20;
}

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1️⃣1️⃣ Interfaces & Abstract Class

📌 Interface:

interface Test {
    void show();
}

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1️⃣2️⃣ Exception Handling

📌 Example:

try {
    int x = 10/0;
} catch(Exception e) {
    System.out.println("Error");
}

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1️⃣3️⃣ Packages

• Built-in
• User-defined

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1️⃣4️⃣ File Handling

• File
• FileReader
• FileWriter

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1️⃣5️⃣ Multithreading

• Thread class
• Runnable interface

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1️⃣6️⃣ Collections Framework

• List (ArrayList)
• Set (HashSet)
• Map (HashMap)

📌 Example:

ArrayList<String> list = new ArrayList<>();

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1️⃣7️⃣ Database Connectivity (JDBC)

• Connect Java with MySQL
• Insert / Update / Delete data

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🌐 ADVANCE JAVA PATH

✔ Web Development

• Servlets
• JSP
• Spring
• Spring Boot

✔ Android Development

• Java + Android Studio

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💼 Career Options

• Java Developer
• Software Engineer
• Android Developer
• Backend Developer

💰 Salary: ₹30,000 – ₹1,20,000+ per month