What Is Pop in Object Oriented Programming?


Angela Bailey

Object-oriented programming (OOP) is a powerful paradigm that allows developers to create and manipulate objects, which are instances of classes. One important concept in OOP is the concept of “pop,” which stands for “polymorphism of parameters.” In this article, we will explore what pop is and how it can be used in object-oriented programming.

Understanding Polymorphism

Before diving into pop, let’s first understand the concept of polymorphism. Polymorphism refers to the ability of an object to take on many forms. In the context of OOP, polymorphism allows objects of different classes to be treated as if they were objects of a common superclass.

Polymorphism provides flexibility and extensibility to our code. It enables us to write more reusable and maintainable software by allowing us to define generic algorithms that can operate on different types of objects.

What Is Pop?

Pop, or polymorphism of parameters, is a specific type of polymorphism that occurs when a single method can accept parameters of multiple different types. This means that we can pass objects of different classes as arguments to the same method.

To achieve pop, we need to define a base class or interface that declares the method with a parameter whose type is a superclass or interface. Then, we can create multiple subclasses that inherit from the base class or implement the interface and provide their own specific implementations for the method.

An Example

Let’s consider an example where we have a base class called Shape. The Shape class has a method called draw(), which will be overridden by its subclasses.

public abstract class Shape {
    public abstract void draw();

public class Circle extends Shape {
    public void draw() {
        System.out.println("Drawing a circle");

public class Square extends Shape {
    public void draw() {
        System.println("Drawing a square");

In the example above, we have two subclasses of Shape: Circle and Square. Both subclasses provide their own implementation of the draw() method.

We can now create a method that accepts an object of type Shape as a parameter and calls its draw() method:

public class DrawingTool {
    public void drawShape(Shape shape) {

The DrawingTool class has a method called drawShape(), which takes an object of type Shape. By accepting objects of different subclasses of Shape, this method demonstrates pop in action.

Using Pop in Object-Oriented Programming

To utilize pop effectively in your code, follow these steps:

  1. Create a base class or interface that declares the polymorphic method.
  2. Create multiple subclasses that inherit from the base class or implement the interface.
  3. In each subclass, provide your own specific implementation for the polymorphic method.
  4. Create methods that accept objects of the base class or interface as parameters and invoke the polymorphic method on them.
  5. You can now pass objects of any subclass to these methods, achieving pop!

By using pop, we can write more flexible and reusable code. It allows us to work with objects of different types through a common interface, enabling us to design more scalable and maintainable software.


In object-oriented programming, pop (polymorphism of parameters) is a powerful concept that enables us to create methods that accept objects of different classes as arguments. By providing a common interface or superclass, we can achieve polymorphic behavior and write more flexible code. Understanding and utilizing pop can greatly enhance the extensibility and maintainability of your OOP projects.

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