Abstraction

title: Abstraction in Java description: Abstract class aur interface se abstraction

Implementation details hide karna, sirf functionality expose karna.

Ways to Achieve

1. Abstract Class (Partial Abstraction)

java exampleWoHoTech

abstract class Vehicle {
    String brand;

    // Abstract method — no body
    abstract void start();
    abstract void stop();

    // Concrete method — has body
    void fuelUp() {
        System.out.println("Fuel bhar raha hai");
    }
}

class Car extends Vehicle {
    @Override
    void start() { System.out.println("Car start: Key ghuma"); }

    @Override
    void stop() { System.out.println("Car stop: Brake dabao"); }
}

2. Interface (Full Abstraction)

java exampleWoHoTech

interface Printable {
    void print(); // implicitly public abstract
}

interface Showable {
    void show();
}

class Document implements Printable, Showable {
    public void print() { System.out.println("Printing..."); }
    public void show() { System.out.println("Showing..."); }
}

Real-world Example

ATM machine — aap dekhte ho buttons aur screen, internal wiring nahi.

java exampleWoHoTech

abstract class ATM {
    abstract void authenticate(String pin);
    abstract void withdrawCash(double amount);

    void displayBalance(double balance) {
        System.out.printf("Balance: Rs %.2f%n", balance);
    }
}

Abstract Class Rules

Object create nahi ho sakta (new AbstractClass() error)
Extend zarur karo
Sabhi abstract methods override karo (ya child bhi abstract ho)

title: Abstraction in Java description: Abstract class aur interface se abstraction

Implementation details hide karna, sirf functionality expose karna.

Ways to Achieve

1. Abstract Class (Partial Abstraction)

java exampleWoHoTech

abstract class Vehicle {
    String brand;

    // Abstract method — no body
    abstract void start();
    abstract void stop();

    // Concrete method — has body
    void fuelUp() {
        System.out.println("Fuel bhar raha hai");
    }
}

class Car extends Vehicle {
    @Override
    void start() { System.out.println("Car start: Key ghuma"); }

    @Override
    void stop() { System.out.println("Car stop: Brake dabao"); }
}

2. Interface (Full Abstraction)

java exampleWoHoTech

interface Printable {
    void print(); // implicitly public abstract
}

interface Showable {
    void show();
}

class Document implements Printable, Showable {
    public void print() { System.out.println("Printing..."); }
    public void show() { System.out.println("Showing..."); }
}

Real-world Example

ATM machine — aap dekhte ho buttons aur screen, internal wiring nahi.

java exampleWoHoTech

abstract class ATM {
    abstract void authenticate(String pin);
    abstract void withdrawCash(double amount);

    void displayBalance(double balance) {
        System.out.printf("Balance: Rs %.2f%n", balance);
    }
}

Abstract Class Rules

Object create nahi ho sakta (new AbstractClass() error)
Extend zarur karo
Sabhi abstract methods override karo (ya child bhi abstract ho)

Abstraction

Ways to Achieve

1. Abstract Class (Partial Abstraction)

2. Interface (Full Abstraction)

Real-world Example

Abstract Class Rules

Continue learning this concept

Abstraction

Ways to Achieve

1. Abstract Class (Partial Abstraction)

2. Interface (Full Abstraction)

Real-world Example

Abstract Class Rules

Continue learning this concept