(Based on your transcript)

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🎯 1. Objective of This Lesson

• Write the first OOP-based Java program
• Understand:
  • Classes
  • Objects
  • Methods
• Move from theory → working code

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🧠 2. Core Philosophy of OOP

👉 Every object consists of:

• State (Data) → Variables
• Behavior (Action) → Methods

👉 Together:
State + Behavior = Object

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🤖 3. Example: Virtual Robot

We create a simple program:

• Robot has:
  • Name (data)
• Robot can:
  • Speak (method)

👉 Output:

Hello, my name is Sparky

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🏗️ 4. Class (Blueprint)

📌 Definition:

• A class is a template or blueprint
• Defines:
  • Variables (state)
  • Methods (behavior)

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⚠️ Important Concept:

👉 Class:

• Does NOT occupy memory
• It’s just a design

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🧩 Example:

class Robot {
    String name;    void sayHello() {
        System.out.println("Hello, my name is " + name);
    }
}

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🔍 Key Points

• String name → Object variable
• sayHello() → Method (function inside class)

👉 Method = Function belonging to a class

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📦 5. Object (Real Entity)

📌 Definition:

• Object is a real instance of a class
• Created from blueprint

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⚠️ Important Concept:

👉 Object:

• Occupies memory (RAM)
• Stores actual data

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🧠 Memory Difference

Class	Object
No memory	Uses memory
Blueprint	Real instance
Abstract	Concrete

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⚙️ 6. Creating Object

Robot r1 = new Robot();

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🔥 Breakdown:

• Robot → Class name
• r1 → Object name
• new → Creates object in memory

👉 new = allocates memory + builds object

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🎮 7. Accessing Object (Dot Operator)

r1.name = "Sparky";
r1.sayHello();

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💡 Dot (.) Operator

👉 Used to:

• Access variables
• Call methods

👉 Think of it as:
Remote control for object

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🧾 8. Main Class (Entry Point)

class Main {
    public static void main(String[] args) {
        Robot r1 = new Robot();
        r1.name = "Sparky";
        r1.sayHello();
    }
}

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🚀 9. Output

Hello, my name is Sparky

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🔁 10. Multiple Objects

Robot r1 = new Robot();
r1.name = "Sparky";Robot r2 = new Robot();
r2.name = "Sia";r1.sayHello();
r2.sayHello();

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🎯 Output:

Hello, my name is Sparky
Hello, my name is Sia

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💡 Key Insight

👉 One class → Multiple objects

Each object:

• Has its own data
• Works independently

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⚠️ 11. Important Concepts

• Variables inside class → Object variables
• Methods inside class → Object methods
• Variables inside method → Normal variables

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🔥 12. Key Takeaways

• Class = Blueprint
• Object = Real instance
• new = Creates object
• . = Access object data & methods
• OOP = Combines data + behavior

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🚀 Final Insight

👉 You don’t just write code
👉 You model real-world entities

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🎯 YOU NOW HAVE:

• Theory ✅
• Code ✅
• Execution ✅

👉 This is complete beginner understanding

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