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    Polymorphism in Java with Examples in 2023

    Polymorphism in Java can be defined as the ability of an object to take many forms. This helps us perform the same action in different ways.

    Polymorphism in Java with Examples – 2023

    By Great Learning Team Updated on Nov 23, 2022 240931

    Table of contents

    Polymorphism is the ability of an object to take on different forms. In Java, polymorphism refers to the ability of a class to provide different implementations of a method, depending on the type of object that is passed to the method.

    To put it simply, polymorphism in Java allows us to perform the same action in many different ways. Any Java object that can pass more than one IS-A test is polymorphic in Java. Therefore, all the Java objects are polymorphic as it has passed the IS-A test for their own type and for the class Object.

    This article also talks about two types of polymorphism in Java: compile time polymorphism and runtime polymorphism, Java polymorphism examples, method overloading, method overriding, why to use polymorphism in java, java programming, and many more.

    Polymorphism is a feature of the object-oriented programming language, Java, which implies that you can perform a single task in different ways. In the technical world, polymorphism in Java allows one to do multiple implementations by defining one interface.

    What is Polymorphism?What is Polymorphism in Java?Real-Life Examples of PolymorphismTypes of PolymorphismMethod Overloading in JavaMethod Overriding in JavaRuntime Polymorphism in JavaCompile-Time Polymorphism in JavaPolymorphism in programmingPolymorphism variablesWhy use Polymorphism in Java?Characteristics of PolymorphismProblems with PolymorphismConclusionFAQs

    What is Polymorphism?

    The derivation of the word Polymorphism is from two different Greek words- poly and morphs. “Poly” means numerous, and “Morphs” means forms. So, polymorphism means innumerable forms. Polymorphism, therefore, is one of the most significant features of Object-Oriented Programming.

    What is Polymorphism in Java?

    Polymorphism in Java is the task that performs a single action in different ways.

    So, languages that do not support polymorphism are not ‘Object-Oriented Languages’, but, ‘Object-Based Languages’. Ada, for instance, is one such language. Since Java supports polymorphism, it is an Object-Oriented Language.

    Polymorphism occurs when there is inheritance, i.e. there are many classes that are related to each other.

    Inheritance is a powerful feature in Java. Java Inheritance lets one class acquire the properties and attributes of another class. Polymorphism in Java allows us to use these inherited properties to perform different tasks. Thus, allowing us to achieve the same action in many different ways.

    Must Learn Java Core Topics

    Java Algorithms Java Data Structures OOPs In Java JDBC In Java Java Basic Programs Java

    Real-Life Examples of Polymorphism

    An individual can have different relationships with different people. A woman can be a mother, a daughter, a sister, a friend, all at the same time, i.e. she performs other behaviours in different situations.

    The human body has different organs. Every organ has a different function to perform; the heart is responsible for blood flow, lungs for breathing, brain for cognitive activity, and kidneys for excretion. So we have a standard method function that performs differently depending upon the organ of the body.

    Polymorphism in Java Example

    A superclass named “Shapes” has a method “area()”. Subclasses of “Shapes” can be “Triangle”, “circle”, “Rectangle”, etc. Each subclass has its way of calculating area. Using Inheritance and Polymorphism means, the subclasses can use the “area()” method to find the area’s formula for that shape.

    class Shapes {

    public void area() {

    System.out.println("The formula for area of ");

    } }

    class Triangle extends Shapes {

    public void area() {

    System.out.println("Triangle is ½ * base * height ");

    } }

    class Circle extends Shapes {

    public void area() {

    System.out.println("Circle is 3.14 * radius * radius ");

    } } class Main {

    public static void main(String[] args) {

    Shapes myShape = new Shapes(); // Create a Shapes object

    Shapes myTriangle = new Triangle(); // Create a Triangle object

    Shapes myCircle = new Circle(); // Create a Circle object

    myShape.area(); myTriangle.area(); myShape.area(); myCircle.area(); } }

    Output:

    The formula for the area of Triangle is ½ * base * height

    The formula for the area of the Circle is 3.14 * radius * radius

    Also Read: OOPs concepts in Java

    Types of Polymorphism

    You can perform Polymorphism in Java via two different methods:

    Method Overloading Method Overriding

    What is Method Overloading in Java?

    Method overloading is the process that can create multiple methods of the same name in the same class, and all the methods work in different ways. Method overloading occurs when there is more than one method of the same name in the class.

    Example of Method Overloading in Java

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    MCQ – Java Polymorphism – Interview Sansar

    MCQ – Java Polymorphism

    Posted in MCQ-JavaBy rsinghPosted on March 11, 2019

    ULTIMATE MCQs – Multiple Choice Questions on Porlymorphism in java oops concept with Answer and Explanation to polish your concepts and help in written test in job interviews.

    MCQs on Polymorphism in Java

    Q) What concepts come under Polymorphism in java?

    Method overloading

    Constructor overloading

    Method overriding All the above

    Answer: 4

    Explanation: All mentioned features come under polymorphism in java oop.

    Method overloading (multiple methods with same name in a class)

    Constructor overloading (multiple constructors in a class)

    Method overriding (methods with same in base and derived class)

    Q) Which polymorphism behavior do you see in below class?

    class Paint {

    // all methods have same name

    public void Color(int x) {

    }

    public void Color(int x, int y) {

    }

    public void Color(int x, int y, int z) {

    } } Method overloading

    Constructor overloading

    Method overriding

    Run time polymorphism

    Answer: 1

    Explanation:

    Method with same name with different number of arguments or same number of arguments with different data types is method overloading in java programming.

    Q) Which polymorphism concept is applied to inheritance relationship in java programming?

    Method overloading

    Constructor overloading

    Method overriding None

    Answer: 3

    Explanation: Method overriding concept is related with inheritance in java. Both base and derived class contains methods with same name and signature. Read method overriding concept in java oop.

    Q) Which feature comes under compile time polymorphism?

    Method overloading

    Constructor overloading

    Method overriding Both A and B Bothe A and C

    Answer: 4

    Method overloading, and constructor overloading come under compile time polymorphism. as compiler resolves overloaded method at compile time. in simple word, compiler can understand which overloaded method or constructor to call at compile time itself.

    Read more on compile time and run time polymorphism in java with example.

    Q) In below java code, whose “Car” will be called?

    class Father { public void car() {

    System.out.println("Father's Car");

    } }

    class Son extends Father {

    public void car() {

    System.out.println("Son's Car");

    } }

    public class Sample {

    public static void main(String[] args) {

    Son john = new Son();

    john.car(); } } Father’s Car Son’s Car

    There is an ambiguity, so no one Car

    Compiler Error

    Answer: 2

    Explanation: Since, both Father class and Son class contain car () method, So, on object creation of Son class, the son’s car() method will be called. Son has overrides car method of base class Father.

    Note that if son does not contain car method, then father class car () method will be called.

    Pages: 1 2

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    OOPS Concepts

    This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Concepts of OOPs”. 1. Which of the following is not OOPS concept in Java? a) Inheritance b) Encapsulation c) Polymorphism d) Compilation 2. Which of the following is a type of polymorphism in Java? a) Compile time polymorphism b) Execution time polymorphism c) ... Read more

    Java Questions & Answers – Concepts of OOPs

    « Prev Next »

    This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Concepts of OOPs”.

    1. Which of the following is not OOPS concept in Java?

    a) Inheritance b) Encapsulation c) Polymorphism d) Compilation View Answer

    2. Which of the following is a type of polymorphism in Java?

    a) Compile time polymorphism

    b) Execution time polymorphism

    c) Multiple polymorphism

    d) Multilevel polymorphism

    View Answer

    3. When does method overloading is determined?

    a) At run time b) At compile time c) At coding time

    d) At execution time

    View Answer

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    4. When Overloading does not occur?

    a) More than one method with same name but different method signature and different number or type of parameters

    b) More than one method with same name, same signature but different number of signature

    c) More than one method with same name, same signature, same number of parameters but different type

    d) More than one method with same name, same number of parameters and type but different signature

    View Answer

    5. Which concept of Java is a way of converting real world objects in terms of class?

    a) Polymorphism b) Encapsulation c) Abstraction d) Inheritance View Answer

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    6. Which concept of Java is achieved by combining methods and attribute into a class?

    a) Encapsulation b) Inheritance c) Polymorphism d) Abstraction View Answer

    7. What is it called if an object has its own lifecycle and there is no owner?

    a) Aggregation b) Composition c) Encapsulation d) Association View Answer advertisement

    8. What is it called where child object gets killed if parent object is killed?

    a) Aggregation b) Composition c) Encapsulation d) Association View Answer

    9. What is it called where object has its own lifecycle and child object cannot belong to another parent object?

    a) Aggregation b) Composition c) Encapsulation d) Association View Answer advertisement

    10. Method overriding is combination of inheritance and polymorphism?

    a) True b) false View Answer

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