Types of Polymorphism in Java [Static & Dynamic Polymorphism with Examples]

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Spotify uses Java polymorphism to handle songs, podcasts, and ads through a single interface—keeping your streaming experience seamless and smart!

Polymorphism in Java is one of the key principles of object-oriented programming that enables a single method, class, or interface to take multiple forms. It allows developers to write cleaner, more modular code by letting the same interface behave differently depending on the underlying object or data. 

This powerful concept is widely used across real-world applications—from simplifying transaction handling in fintech platforms to managing dynamic UI components in mobile apps.

In this blog, we’ll explore the two main types of polymorphism in Java: static (compile-time) and dynamic (runtime). If you’re planning to start or advance your coding career, mastering polymorphism is a must—and this guide will help you build that foundation with practical examples and clarity.

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Check out OOPs concepts and examples.

Types of Polymorphism in Java

When something is “polymorphic,” it means it can take on many forms. In programming, polymorphism lets us treat objects as instances of their parent class instead of their specific class. This allows one interface to do different things. It makes code flexible and easier to work with.

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Polymorphism in Java is one of the four main ideas in Object-Oriented Programming (OOP). There are two main types of polymorphism in Java: compile-time (also called static polymorphism) and runtime (also called dynamic polymorphism). Each type handles data and behaviors in its own way. In this section, we’ll look at both types with definitions, examples, and explanations of how polymorphism works in Java.

Compile-time Polymorphism (Static Polymorphism) in Java

Compile-time Polymorphism, also known as Static Polymorphism in Java, is a type of polymorphism in Java resolved at the time of compilation. It allows methods to have the same name but perform different tasks based on parameters. Unlike dynamic polymorphism, which occurs at runtime, compile-time polymorphism in Java is determined by the compiler, making it faster and more efficient since all method calls are resolved during compilation.

Java achieves compile-time polymorphism mainly through method overloading and operator overloading to a limited extent.

Characteristics of Compile-time Polymorphism in Java

• Early Binding: The compiler determines which method to call during the compile phase.
• Method Overloading: Achieved by having multiple methods in the same class with the same name but different parameter lists.
• Efficiency: Reduces runtime errors and allows optimized method calls since the exact method is decided at compile time.
• Method Signature: Each overloaded method must have a unique signature, which includes the number, type, and order of parameters.

How Compile-time Polymorphism Works

1. Method Overloading(or, Function Overloading):
In method overloading, multiple methods can have the same name in a class but must differ in parameter count, parameter type, or parameter order. The Java compiler decides which method to call based on the method signature at compile time.

Example of Method Overloading:

java
class SimpleCalculator {
    // Method with two parameters
    int add(int a, int b) {
        return a + b;
    }
    // Overloaded method with three parameters
    int add(int a, int b, int c) {
        return a + b + c;
    }
}


public class Demo {

    public static void main(String[] args) {

        SimpleCalculator obj = new SimpleCalculator();

        // Calls the method with two parameters

        System.out.println(obj.add(25, 25));  // Output: 50

        // Calls the method with three parameters

        System.out.println(obj.add(25, 25, 30));  // Output: 80

    }

}

Output

50
80

Explanation

• The SimpleCalculator class defines two add methods:
  • The first add method takes two integer parameters (int a and int b) and returns their sum.
  • The second add method takes three integer parameters (int a, int b, int c) and returns their combined sum.
• Method Overloading: Both methods are named add, but they have different parameter lists, allowing them to coexist in the same class. Java’s compiler can distinguish between these methods based on the number of arguments passed when they are called.
• In the Demo class:
  • obj.add(25, 25); calls the add method with two parameters, so it executes the first method, returning 50.
  • obj.add(25, 25, 30); calls the add method with three parameters, so it executes the second method, returning 80.

Here, the add method is overloaded with two versions: one that accepts two parameters and another that accepts three parameters. Based on the arguments passed, the compiler determines which method to call.

2. Rules for Method Overloading in Java:

• Number of Parameters: The method signature can differ by the number of parameters. For example, add(int a, int b) and add(int a, int b, int c) differ in the number of arguments.
• Type of Parameters: The method can also differ by parameter types. For example, add(int a, double b) differs from add(double a, double b).
• Order of Parameters: Another way to overload methods is by changing the order of parameters. For instance, display(String text, int number) and display(int number, String text) are considered different signatures.

3. Limitations:
Java does not support operator overloading (except for the + operator, which is used for both numeric addition and string concatenation). This is to maintain simplicity and avoid confusion.

Also Read: Abstract Class in Java – With Examples

Subtypes of Compile-time Polymorphism in Java

1. Function Overloading (Method Overloading in Java)

Function overloading (or method overloading in Java) allows multiple methods with the same name to coexist in a class, as long as they differ in their parameter list (either by number, type, or order). This enables a single function name to perform different tasks based on the type of input it receives.

Code Example

java
class Printer {
    void print(String text) {
        System.out.println("Printing String: " + text);
    }

    void print(int number) {
        System.out.println("Printing Integer: " + number);
    }
}

public class Demo {

    public static void main(String[] args) {

        Printer printer = new Printer();

        printer.print("Hello World");  // Calls the method with String parameter

        printer.print(100);            // Calls the method with int parameter

    }

}

Explanation:

• The Printer class has two print methods:
  • One that accepts a String and prints "Printing String: " followed by the string.
  • Another that accepts an int and prints "Printing Integer: " followed by the integer.
• Method Overloading in Action: The print method is overloaded to handle different types of data. When printer.print("Hello World"); is called, the compiler recognizes the String argument and calls the print method that accepts a String. When printer.print(100); is called, it identifies the int argument and calls the print method that accepts an int.

Output:

mathematica
Printing String: Hello World
Printing Integer: 100

2. Operator Overloading (limited in Java)

Operator overloading allows an operator to perform different operations depending on the context. While Java restricts operator overloading for simplicity, it does overload the + operator to perform both addition and string concatenation.

Code Example of + Operator Overloading

java

public class OperatorOverloadingExample {

    public static void main(String[] args) {

        // Addition operation

        int sum = 10 + 20;

        System.out.println("Sum: " + sum);  // Expected output: Sum: 30

        // Concatenation operation

        String message = "Hello" + " World";

        System.out.println("Message: " + message);  // Expected output: Message: Hello World

    }

}

Explanation:

• Addition Operation: When the + operator is used with two numbers, it performs an addition, as shown with int sum = 10 + 20;.
• String Concatenation: When the + operator is used with strings, it concatenates them, as with String message = "Hello" + " World";.

The + operator behaves differently based on the types of operands. If both are numeric, it adds them. If either operand is a String, it performs concatenation, demonstrating Java’s limited form of operator overloading.

Output:

30
Hello World

Must Read: Learn Java free!

3. Templates (Generics in Java)

Java does not have templates like C++, but it uses generics to achieve similar functionality. Generics allow classes and methods to operate on various data types without requiring specific implementations for each type, making code more flexible and type-safe.

Code Example of Generics in Java

java

class Box<T> {

    private T item;

    public void setItem(T item) {

        this.item = item;

    }

    public T getItem() {

        return item;

    }

}

public class Demo {

    public static void main(String[] args) {

        Box<Integer> intBox = new Box<>();

        intBox.setItem(100);

        System.out.println(intBox.getItem());  // Output: 100

        Box<String> strBox = new Box<>();

        strBox.setItem("Hello Generics");

        System.out.println(strBox.getItem());  // Output: Hello Generics

    }

}

Explanation:

• The Box<T> class uses a generic type T to store any data type (Integer, String, etc.) in the item variable.
• Flexibility with Generics: By declaring Box<Integer> intBox, we specify that intBox can only hold Integer values. Similarly, Box<String> strBox can only hold String values. This flexibility is similar to templates in C++.

Output:

100
Hello Generics

Key Advantages of Compile-time Polymorphism in Java

• Faster Execution: Since method calls are resolved at compile time, it results in faster code execution.
• Reduced Runtime Errors: Any mismatched method calls are caught during compilation, minimizing runtime errors.
• Code Flexibility: Method overloading provides flexibility by allowing methods to handle different data inputs and scenarios.

Runtime Polymorphism (Dynamic Polymorphism) in Java

Runtime polymorphism, also known as dynamic polymorphism, is resolved during the program’s execution rather than at compile time. This type of polymorphism in Java is achieved through method overriding, allowing subclasses to provide specific implementations for methods already defined in their superclass. The Java Virtual Machine (JVM) determines which method to call at runtime, providing flexibility and enhancing the scalability of Java programs.

Unlike static polymorphism in Java, where the compiler knows which method to execute, in dynamic polymorphism, this decision is made by the JVM during execution. This feature enables Java programs to handle method calls flexibly, adapting to different classes and promoting code reusability.

How Runtime Polymorphism Works

1. Method Overriding

• Method overriding occurs when a subclass has a method with the same name, return type, and parameters as a method in its superclass. This allows the subclass to provide its own specific implementation for that method.
• When an overridden method is called using a superclass reference that points to a subclass object, the subclass’s version of the method is executed. This dynamic binding provides flexibility in handling method calls across different class types.

Example of Method Overriding:

In this example, we demonstrate runtime polymorphism using two classes, Bike and Splendor. Here, Bike is the superclass with a method run, and Splendor is a subclass that overrides the run method. By creating an instance of Splendor and assigning it to a Bike reference, we observe how Java decides which run method to execute at runtime.

java
class Bike {
    void run() {
        System.out.println("Bike is running");
    }
}
class Splendor extends Bike {
    @Override
    void run() {
        System.out.println("Splendor is running safely at 30 km/h");
    }
    public static void main(String[] args) {
        Bike bike = new Splendor(); // Upcasting
        bike.run();  // Output: Splendor is running safely at 30 km/h

    }

}

Output:

arduino
Splendor is running safely at 30 km/h

Explanation:

• The Bike class has a run method that prints "Bike is running."
• The Splendor class, which extends Bike, overrides the run method to print "Splendor is running safely at 30 km/h."
• In main, we create a Bike reference (bike) and assign it an instance of Splendor. This is called upcasting, where a subclass object is referenced by a superclass reference.
• When bike.run() is called, Java looks at the actual object type (which is Splendor) and executes the run method in Splendor, not Bike.

This demonstrates runtime polymorphism, where the method call is resolved at runtime based on the actual type of the object (Splendor), even though the reference is of type Bike.

Learn More About: Abstract Method in Java

2. Understanding Upcasting

• Upcasting refers to the process of treating a subclass object as an instance of its superclass. In Java, this is done by using a superclass reference to refer to a subclass object. Upcasting is essential for achieving runtime polymorphism because it allows the superclass reference to call overridden methods in the subclass.

Example of Upcasting

In this example, we use ABC as the superclass and XYZ as the subclass. The myMethod in ABC is overridden by XYZ, and we use upcasting to assign an XYZ object to an ABC reference. This shows dynamic binding as the myMethod in XYZ is called at runtime.

java
class ABC {
    public void myMethod() {
        System.out.println("Method in ABC");
    }
}
public class XYZ extends ABC {
    @Override
    public void myMethod() {
        System.out.println("Method in XYZ");
    }
    public static void main(String[] args) {
        ABC obj = new XYZ();  // Upcasting
        obj.myMethod();  // Output: Method in XYZ

    }
}

Output:

mathematica
Method in XYZ

Explanation:

• The ABC class has a method myMethod that prints "Method in ABC."
• The XYZ class, which extends ABC, overrides myMethod to print "Method in XYZ."
• In main, we create a reference obj of type ABC but assign it an XYZ object. This is upcasting, where a superclass reference points to a subclass object.
• When obj.myMethod() is called, Java identifies the actual object type (XYZ) and executes the overridden method in XYZ instead of ABC.

3.  Rules for Method Overriding in Java:

• There must be inheritance between classes.
• The method signature (name, number, and type of arguments) must match exactly between the superclass and subclass.
• The overridden method should be marked with @Override (optional but recommended for readability and error-checking).

Subtypes of Runtime Polymorphism in Java

Virtual Functions (conceptual in Java)

Java doesn’t directly use the term "virtual functions" as in C++, but the concept is similar. All non-static and non-final methods in Java are "virtual" by default, meaning they can be overridden in subclasses. When a method is called on a superclass reference pointing to a subclass object, Java dynamically selects the overridden method in the subclass at runtime. This is known as dynamic dispatch.

• Example: In the examples above, methods like run and myMethod act as virtual functions since they enable polymorphic behavior through overriding.

Characteristics of Runtime Polymorphism in Java

• Late Binding: The JVM determines the method to execute at runtime, providing flexibility in method selection.
• Supports Inheritance: Runtime polymorphism relies on inheritance, allowing subclasses to customize superclass methods.
• Dynamic Dispatch: The actual method called is based on the object type at runtime, supporting flexible and adaptable code.

Advantages of Runtime Polymorphism in Java

• Code Reusability and Maintenance: Subclasses can use and customize superclass methods, making code reusable and easier to maintain.
• Increased Flexibility: Programs can handle different types of objects through superclass references, allowing flexible interactions.
• Supports Design Patterns: Runtime polymorphism enables design patterns like Strategy and Template Method, promoting robust design and functionality.

Key Differences Between Compile-Time and Runtime Polymorphism

Polymorphism in Java is broadly classified into two types: compile-time polymorphism and runtime polymorphism. While both enable methods to behave differently based on context, they operate at distinct stages of program execution. Understanding their differences is crucial for selecting the right approach during software design and optimizing code performance.

Use Cases and Applications

Both compile-time and runtime polymorphism serve distinct purposes in Java application development. Understanding where and how to apply each can significantly enhance code maintainability, flexibility, and performance. The list below outlines the practical applications for both types of polymorphism:

1. Performance-Critical Systems (Compile-Time Polymorphism)

Compile-time polymorphism is ideal for scenarios where execution speed and resource optimization are paramount. It’s heavily used in:

• Real-time gaming engines
• High-frequency trading platforms
• Embedded systems and firmware
• Scientific computing applications

Since method binding happens at compile time, these systems benefit from reduced runtime overhead.

2. Enterprise-Grade Applications (Runtime Polymorphism)

Enterprise software demands scalability, flexibility, and maintainability. Runtime polymorphism is extensively used in:

• ERP and CRM systems
• Cloud-based SaaS platforms
• Enterprise microservices architecture
• Backend systems supporting evolving business logic

The dynamic method binding allows businesses to adapt functionality without major code rewrites.

3. Framework and API Development (Runtime Polymorphism)

Popular frameworks and libraries rely on runtime polymorphism to offer extensibility and plug-in capabilities:

• Java Spring Framework
• Hibernate ORM
• Dependency Injection frameworks
• Web service frameworks (RESTful APIs)

It enables third-party developers to extend core functionalities without altering the framework itself.

4. Implementation of Design Patterns (Runtime Polymorphism)

Several core design patterns are fundamentally based on runtime polymorphism, including:

• Factory Pattern
• Strategy Pattern
• Command Pattern
• Observer Pattern

These patterns promote loose coupling and dynamic behavior adjustment at runtime.

5. Code Maintainability and Extensibility

• Compile-Time: Easier to maintain when application logic is stable and predictable.
• Runtime: Easier to extend for systems that anticipate frequent changes, updates, or feature additions.

6. Testing and Debugging

• Compile-Time Polymorphism: Simplifies debugging due to early binding — method resolution occurs during compilation.
• Runtime Polymorphism: Requires comprehensive test coverage since method calls are resolved dynamically at runtime, increasing potential execution paths.

Examples of Polymorphism in Java

Polymorphism in Java can be categorized into compile-time polymorphism (method overloading) and runtime polymorphism (method overriding). Below are detailed explanations and examples to illustrate each type, with three examples each for compile-time and runtime polymorphism.

Compile-Time Polymorphism (Method Overloading)

In compile-time polymorphism, method selection occurs at compile time based on the method signature.

• Example 1: MathOperations with Overloaded multiply Method

  In this example, the MathOperations class has an overloaded multiply method that can handle either two or three integer arguments.

java
class MathOperations {
    // Method to multiply two numbers
    int multiply(int a, int b) {
        return a * b;

    }

    // Overloaded method to multiply three numbers

    int multiply(int a, int b, int c) {

        return a * b * c;
    }

}



public class Demo {

    public static void main(String[] args) {

        MathOperations operations = new MathOperations();

        // Calls the multiply method with two parameters

        System.out.println("Multiplying two numbers: " + operations.multiply(3, 4));  // Output: 12

        // Calls the multiply method with three parameters

        System.out.println("Multiplying three numbers: " + operations.multiply(2, 3, 4));  // Output: 24

    }

}

Explanation:

• The multiply method is overloaded to handle two different cases: multiplying two numbers and multiplying three numbers.
• The compiler determines which method to call based on the number of arguments.

Output:

yaml
Multiplying two numbers: 12
Multiplying three numbers: 24

• Example 2: DistanceCalculator with Overloaded distance Method

  In this example, the DistanceCalculator class has an overloaded distance method that calculates distance based on different types of input parameters.

java
class DistanceCalculator {
    // Method to calculate distance with speed and time (in km/hr and hours)
    double distance(double speed, double time) {
        return speed * time;
    }

    // Overloaded method to calculate distance using velocity and time in meters per second
    double distance(int velocity, int time) {
        return velocity * time;

    }

}

public class Demo {

    public static void main(String[] args) {
        DistanceCalculator calculator = new DistanceCalculator();
        // Calls the distance method with double parameters
        System.out.println("Distance (km): " + calculator.distance(60.0, 2.5));  // Output: 150.0
        // Calls the distance method with int parameters
        System.out.println("Distance (m): " + calculator.distance(5, 10));  // Output: 50

    }

}

Explanation:

• The distance method is overloaded to handle different data types: double and int.
• The compiler selects the appropriate method based on the parameter types.

Output:

scss
Distance (km): 150.0
Distance (m): 50

• Example 3: Overloading calculateArea for Shapes

  Here, the ShapeCalculator class overloads the calculateArea method to compute the area of different shapes based on the parameters provided.

java
class ShapeCalculator {
    // Method to calculate area of a circle
    double calculateArea(double radius) {
        return Math.PI * radius * radius;
    }

    // Overloaded method to calculate area of a rectangle
    double calculateArea(double length, double width) {
        return length * width;
    }
}
public class Demo {
    public static void main(String[] args) {
        ShapeCalculator calculator = new ShapeCalculator();
        // Calls the calculateArea method for a circle
        System.out.println("Area of circle: " + calculator.calculateArea(5.0));  // Output: 78.5398
        // Calls the calculateArea method for a rectangle
        System.out.println("Area of rectangle: " + calculator.calculateArea(5.0, 10.0));  // Output: 50.0

    }

}

Explanation:

• The calculateArea method is overloaded to calculate the area of a circle or a rectangle.
• The compiler chooses the correct method based on the number of parameters.

Output:

mathematica
Area of circle: 78.5398
Area of rectangle: 50.0

Runtime Polymorphism (Method Overriding)

In runtime polymorphism, the method to be executed is determined during runtime based on the object type.

• Example 1: Employee Payment Calculation

  In this example, the Employee class has a calculatePay method that is overridden by the HourlyEmployee and SalariedEmployee subclasses to calculate pay based on different payment structures.

java
class Employee {
    double calculatePay() {
        return 0;
    }
}

class HourlyEmployee extends Employee {
    double hoursWorked;
    double hourlyRate;
    HourlyEmployee(double hoursWorked, double hourlyRate) {
        this.hoursWorked = hoursWorked;
        this.hourlyRate = hourlyRate;
    }
    @Override
    double calculatePay() {
        return hoursWorked * hourlyRate;
    }
}

class SalariedEmployee extends Employee {
    double monthlySalary;
    SalariedEmployee(double monthlySalary) {
        this.monthlySalary = monthlySalary;
    }
    @Override

    double calculatePay() {

        return monthlySalary;

    }

}

public class Demo {
    public static void main(String[] args) {
        Employee hourly = new HourlyEmployee(40, 120);  // 40 hours at ₹120/hour
        Employee salaried = new SalariedEmployee(50000);  // Monthly salary of ₹50,000
        System.out.println("Hourly Employee Pay: ₹" + hourly.calculatePay());  // Output: ₹4800.0
        System.out.println("Salaried Employee Pay: ₹" + salaried.calculatePay());  // Output: ₹50000.0

    }

}

Explanation:

• The calculatePay method is overridden in the HourlyEmployee and SalariedEmployee subclasses.
  • HourlyEmployee calculates pay based on hours worked and hourly rate.
  • SalariedEmployee uses a fixed monthly salary.
• At runtime, Java invokes the appropriate calculatePay method based on the object type (HourlyEmployee or SalariedEmployee).

Output:

yaml
Hourly Employee Pay: ₹4800.0
Salaried Employee Pay: ₹50000.0

• Example 2: Library Items with Overridden displayInfo Method

  In this example, we have a LibraryItem superclass with a displayInfo method. Book and Magazine subclasses override this method to display information specific to each item type.

java
class LibraryItem {
    void displayInfo() {
        System.out.println("Library item information.");

    }

}

class Book extends LibraryItem {
    @Override
    void displayInfo() {
        System.out.println("This is a book.");

    }

}

class Magazine extends LibraryItem {
    @Override
    void displayInfo() {
        System.out.println("This is a magazine.");
    }

}

public class Demo {

    public static void main(String[] args) {
        LibraryItem item1 = new Book();
        LibraryItem item2 = new Magazine();


        item1.displayInfo();  // Output: This is a book.
        item2.displayInfo();  // Output: This is a magazine.

    }

}

Explanation:

• The displayInfo method is overridden to provide specific details for Book and Magazine.
• Java dynamically determines the appropriate displayInfo method to call at runtime based on the object type.

Output:

csharp
This is a book.
This is a magazine.

• Example 3: Shape Perimeters with Overridden perimeter Method

  This example includes a Shape superclass with an overridden perimeter method in subclasses Rectangle and Triangle.

java
class Shape {
    double perimeter() {
        return 0;

    }

}

class Rectangle extends Shape {
    double length, width;
    Rectangle(double length, double width) {
        this.length = length;
        this.width = width;

    }

    @Override
    double perimeter() {
        return 2 * (length + width);

    }

}

class Triangle extends Shape {
    double a, b, c;
    Triangle(double a, double b, double c) {
        this.a = a;
        this.b = b;
        this.c = c;
    }

    @Override
    double perimeter() {
        return a + b + c;

    }

}

public class Demo {
    public static void main(String[] args) {
        Shape rectangle = new Rectangle(5, 10);
        Shape triangle = new Triangle(3, 4, 5);

        System.out.println("Rectangle Perimeter: " + rectangle.perimeter());  // Output: 30.0

        System.out.println("Triangle Perimeter: " + triangle.perimeter());    // Output: 12.0

    }

}

Explanation:

• The perimeter method is overridden to calculate the perimeter for different shapes (Rectangle and Triangle).
• Java decides which perimeter method to invoke based on the object type.

Output:

mathematica
Rectangle Perimeter: 30.0
Triangle Perimeter: 12.0

Also Read: Polymorphism In OOPS

Advantages of Polymorphism in Java

Polymorphism in Java provides numerous benefits, making code more flexible, reusable, and easier to manage. Here’s a breakdown of key advantages:

Disadvantages of Polymorphism in Java

While polymorphism is powerful, it does have some drawbacks that can impact performance, complexity, and debugging.

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Conclusion

Polymorphism in Java is a fundamental concept that enables objects to take on multiple forms, enhancing code flexibility and maintainability. It manifests in two primary types: static (compile-time) polymorphism, achieved through method overloading, and dynamic (runtime) polymorphism, realized via method overriding. 

Understanding and effectively implementing both forms allows developers to write more adaptable and scalable code, as it promotes the use of a unified interface for different underlying data types. By leveraging polymorphism, Java programs can handle various object types uniformly, leading to more robust and extensible software design.

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