Polymorphism in Java

    Polymorphism is a concept by which we can perform a single action in different ways.

There are two types of polymorphism in Java: compile-time polymorphism and runtime polymorphism. We can perform polymorphism in java by method overloading and method overriding.

• Compile-time Polymorphism (Method Overloading):

• Method overloading occurs when a class has multiple methods with the same name but different parameters (number, type, or order of parameters).
• The compiler determines which method to call based on the number and types of arguments passed during the method invocation.

public class Calculator {

public int add(int a, int b) {

return a + b;

}

public double add(double a, double b) {

return a + b;

}

}

• Runtime Polymorphism (Method Overriding):

• Runtime polymorphism is achieved through method overriding. It occurs when a subclass provides a specific implementation for a method that is already defined in its superclass.
• The overridden method in the subclass should have the same signature (name, return type, and parameters) as the method in the superclass.

Runtime polymorphism can't be achieved by data members.

class Animal {

public void makeSound() {

System.out.println("Some generic sound");

}

}

class Dog extends Animal {

@Override

public void makeSound() {

System.out.println("Bark");

}

}

class Cat extends Animal {

@Override

public void makeSound() {

System.out.println("Meow");

}

}