Polymorphism

title: Polymorphism in Java description: Compile-time aur runtime polymorphism

Poly = Many, Morph = Forms. Same method alag-alag forms mein kaam karna.

1. Compile-time Polymorphism (Method Overloading)

Same method name, different parameters. Compile time par decide hota hai.

java exampleWoHoTech

class Calculator {
    int add(int a, int b) { return a + b; }
    double add(double a, double b) { return a + b; }
    int add(int a, int b, int c) { return a + b + c; }
    String add(String a, String b) { return a + b; }
}

Calculator calc = new Calculator();
calc.add(5, 3);          // 8
calc.add(3.14, 2.5);     // 5.64
calc.add(1, 2, 3);       // 6
calc.add("Hello", " World"); // "Hello World"

2. Runtime Polymorphism (Method Overriding)

Parent class reference child class object hold karta hai. Runtime par decide hota hai.

java exampleWoHoTech

class Shape {
    void draw() { System.out.println("Shape draw ho rahi hai"); }
}

class Circle extends Shape {
    @Override
    void draw() { System.out.println("Circle draw ho rahi hai"); }
}

class Rectangle extends Shape {
    @Override
    void draw() { System.out.println("Rectangle draw ho raha hai"); }
}

// Runtime Polymorphism
Shape s;
s = new Circle();    s.draw(); // "Circle draw ho rahi hai"
s = new Rectangle(); s.draw(); // "Rectangle draw ho raha hai"

Dynamic Method Dispatch

java exampleWoHoTech

Shape[] shapes = {new Circle(), new Rectangle(), new Circle()};
for (Shape shape : shapes) {
    shape.draw(); // Runtime par actual type decide hota hai
}

title: Polymorphism in Java description: Compile-time aur runtime polymorphism

Poly = Many, Morph = Forms. Same method alag-alag forms mein kaam karna.

1. Compile-time Polymorphism (Method Overloading)

Same method name, different parameters. Compile time par decide hota hai.

java exampleWoHoTech

class Calculator {
    int add(int a, int b) { return a + b; }
    double add(double a, double b) { return a + b; }
    int add(int a, int b, int c) { return a + b + c; }
    String add(String a, String b) { return a + b; }
}

Calculator calc = new Calculator();
calc.add(5, 3);          // 8
calc.add(3.14, 2.5);     // 5.64
calc.add(1, 2, 3);       // 6
calc.add("Hello", " World"); // "Hello World"

2. Runtime Polymorphism (Method Overriding)

Parent class reference child class object hold karta hai. Runtime par decide hota hai.

java exampleWoHoTech

class Shape {
    void draw() { System.out.println("Shape draw ho rahi hai"); }
}

class Circle extends Shape {
    @Override
    void draw() { System.out.println("Circle draw ho rahi hai"); }
}

class Rectangle extends Shape {
    @Override
    void draw() { System.out.println("Rectangle draw ho raha hai"); }
}

// Runtime Polymorphism
Shape s;
s = new Circle();    s.draw(); // "Circle draw ho rahi hai"
s = new Rectangle(); s.draw(); // "Rectangle draw ho raha hai"

Dynamic Method Dispatch

java exampleWoHoTech

Shape[] shapes = {new Circle(), new Rectangle(), new Circle()};
for (Shape shape : shapes) {
    shape.draw(); // Runtime par actual type decide hota hai
}

Polymorphism

1. Compile-time Polymorphism (Method Overloading)

2. Runtime Polymorphism (Method Overriding)

Dynamic Method Dispatch

Continue learning this concept

Polymorphism

1. Compile-time Polymorphism (Method Overloading)

2. Runtime Polymorphism (Method Overriding)

Dynamic Method Dispatch

Continue learning this concept