Explain polymorphism with examples.

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Polymorphism is one of the fundamental concepts of Object-Oriented Programming (OOP) in Java. The term “polymorphism” means “many forms.” It allows a single action to behave differently based on the object performing it.
In Java, polymorphism enables objects to be treated as instances of their parent class rather than their actual class, allowing flexibility and extensibility in code design.
🔹 Types of Polymorphism:
Compile-time Polymorphism (Method Overloading)
Achieved by defining multiple methods with the same name but different parameters in the same class.
Example:
java
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Edit
class Calculator {
int add(int a, int b) {
return a + b;
}
double add(double a, double b) {
return a + b;
}
}
Runtime Polymorphism (Method Overriding)
Occurs when a subclass overrides a method of its superclass and the decision of which method to call is made at runtime.
Example:
java
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Edit
class Animal {
void sound() {
System.out.println("Animal makes sound");
}
}
class Dog extends Animal {
void sound() {
System.out.println("Dog barks");
}
}

class Cat extends Animal {
void sound() {
System.out.println("Cat meows");
}
}
public class TestPolymorphism {
public static void main(String[] args) {
Animal a;
a = new Dog();
a.sound(); // Output: Dog barks

a = new Cat();
a.sound(); // Output: Cat meows
}
}
🔹 Benefits of Polymorphism:
Code reusability
Supports method overriding
Promotes loose coupling and scalability
Improves readability and maintenance
In summary, polymorphism in Java allows one interface to be used for a general class of actions, helping you write more flexible and maintainable code.

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