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    Overriding vs Overloading in Java

    Technical tutorials, Q&A, events — This is an inclusive place where developers can find or lend support and discover new ways to contribute to the community.

    // Tutorial //

    Overriding vs Overloading in Java

    Published on August 3, 2022 · Updated on September 30, 2022

    Java By Pankaj

    Developer and author at DigitalOcean.

    Introduction

    Overriding and overloading are the core concepts in Java programming. They are the ways to implement polymorphism in our Java programs. Polymorphism is one of the OOPS Concepts.

    Screenshot of Java code with arrows pointing at instances where overloading and overriding are occurring.

    When the method signature (name and parameters) are the same in the superclass and the child class, it’s called overriding. When two or more methods in the same class have the same name but different parameters, it’s called overloading.

    Comparing overriding and overloading

    Overriding Overloading

    Implements “runtime polymorphism” Implements “compile time polymorphism”

    The method call is determined at runtime based on the object type The method call is determined at compile time

    Occurs between superclass and subclass Occurs between the methods in the same class

    Have the same signature (name and method arguments) Have the same name, but the parameters are different

    On error, the effect will be visible at runtime On error, it can be caught at compile time

    Overriding and overloading example

    Here is an example of overloading and overriding in a Java program:

    package com.journaldev.examples;

    import java.util.Arrays;

    public class Processor {

    public void process(int i, int j) {

    System.out.printf("Processing two integers:%d, %d", i, j);

    }

    public void process(int[] ints) {

    System.out.println("Adding integer array:" + Arrays.toString(ints));

    }

    public void process(Object[] objs) {

    System.out.println("Adding integer array:" + Arrays.toString(objs));

    } }

    class MathProcessor extends Processor {

    @Override

    public void process(int i, int j) {

    System.out.println("Sum of integers is " + (i + j));

    } @Override

    public void process(int[] ints) {

    int sum = 0;

    for (int i : ints) {

    sum += i; }

    System.out.println("Sum of integer array elements is " + sum);

    } }

    Overriding

    The process() method and int i, int j parameters in Processor are overridden in the child class MathProcessor. Line 7 and line 23:

    public class Processor {

    public void process(int i, int j) { /* ... */ }

    } /* ... */

    class MathProcessor extends Processor {

    @Override

    public void process(int i, int j) { /* ... */ }

    }

    And process() method and int[] ints in Processor are also overridden in the child class. Line 11 and line 28:

    public class Processor {

    public void process(int[] ints) { /* ... */ }

    } /* ... */

    class MathProcessor extends Processor {

    @Override

    public void process(Object[] objs) { /* ... */ }

    }

    Overloading

    The process() method is overloaded in the Processor class. Lines 7, 11, and 15:

    public class Processor {

    public void process(int i, int j) { /* ... */ }

    public void process(int[] ints) { /* ... */ }

    public void process(Object[] objs) { /* ... */ }

    }

    Conclusion

    In this article, we covered overriding and overloading in Java. Overriding occurs when the method signature is the same in the superclass and the child class. Overloading occurs when two or more methods in the same class have the same name but different parameters.

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    About the authors Pankaj Author

    Developer and author at DigitalOcean.

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    Was this helpful? JournalDev February 3, 2022

    Thanks you. because l have irritating this concept understanding after that your implement concept and explain easy understanding ,so iam very happy

    - ambika JournalDev January 31, 2022

    Its good but with an Example its better for more Understanding. Overall efforts are good.

    - Shriganesh Mane JournalDev September 10, 2021

    Great explanation of the topic. You made it simple and easy to understanding. Thank you.

    - David JournalDev June 9, 2021

    Nice, concise explanations. Referring my students here for this topic.

    - Mark Miller JournalDev May 21, 2021

    thanks for clear explanation of difference

    - MOHAMMAD AHTISHAM JournalDev August 24, 2019

    hello, very happy with this website.

    स्रोत : www.digitalocean.com

    Difference Between Method Overloading and Method Overriding in Java

    A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

    Difference Between Method Overloading and Method Overriding in Java

    Difficulty Level : Easy

    Last Updated : 22 Oct, 2022

    Read Discuss Practice Video Courses

    The differences between Method Overloading and Method Overriding in Java are as follows:

    Method Overloading Method Overriding

    Method overloading is a compile-time polymorphism. Method overriding is a run-time polymorphism.

    It helps to increase the readability of the program. It is used to grant the specific implementation of the method which is already provided by its parent class or superclass.

    It occurs within the class. It is performed in two classes with inheritance relationships.

    Method overloading may or may not require inheritance. Method overriding always needs inheritance.

    In method overloading, methods must have the same name and different signatures. In method overriding, methods must have the same name and same signature.

    In method overloading, the return type can or can not be the same, but we just have to change the parameter. In method overriding, the return type must be the same or co-variant.

    Static binding is being used for overloaded methods. Dynamic binding is being used for overriding methods.

    Poor Performance due to compile time polymorphism. It gives better performance. The reason behind this is that the binding of overridden methods is being done at runtime.

    Private and final methods can be overloaded. Private and final methods can’t be overridden.

    Argument list should be different while doing method overloading. Argument list should be same in method overriding.

    Method Overloading:

    Method Overloading is a Compile time polymorphism. In method overloading, more than one method shares the same method name with a different signature in the class. In method overloading, the return type can or can not be the same, but we have to change the parameter because, in java, we can not achieve the method overloading by changing only the return type of the method.

    Example of Method Overloading:

    Java

    import java.io.*;

    class MethodOverloadingEx {

    static int add(int a, int b)

    { return a + b; }

    static int add(int a, int b, int c)

    { return a + b + c; }

    public static void main(String args[])

    {

    System.out.println("add() with 2 parameters");

    System.out.println(add(4, 6));

    System.out.println("add() with 3 parameters");

    System.out.println(add(4, 6, 7));

    } }

    Output

    add() with 2 parameters

    10

    add() with 3 parameters

    17

    Method Overriding: 

    Method Overriding is a Run time polymorphism. In method overriding, the derived class provides the specific implementation of the method that is already provided by the base class or parent class. In method overriding, the return type must be the same or co-variant (return type may vary in the same direction as the derived class).

    Example: Method Overriding

    Java

    import java.io.*; class Animal { void eat() {

    System.out.println("eat() method of base class");

    System.out.println("eating.");

    } }

    class Dog extends Animal {

    void eat() {

    System.out.println("eat() method of derived class");

    System.out.println("Dog is eating.");

    } }

    class MethodOverridingEx {

    public static void main(String args[])

    { Dog d1 = new Dog();

    Animal a1 = new Animal();

    d1.eat(); a1.eat();

    Animal animal = new Dog();

    // eat() method of animal class is overridden by

    // base class eat() animal.eat(); } }

    C++

    Output

    eat() method of derived class

    Dog is eating.

    eat() method of base class

    eating.

    eat() method of derived class

    Dog is eating.

    Output explanation: Here, we can see that a method eat() has overridden in the derived class name Dog that is already provided by the base class name Animal. When we create the instance of class Dog and call the eat() method, we see that only derived class eat() method run instead of base class method eat(), and When we create the instance of class Animal and call the eat() method, we see that only base class eat() method run instead of derived class method eat().

    स्रोत : www.geeksforgeeks.org

    Difference between Method Overloading and Method Overriding in java

    Difference between Method Overloading and Method Overriding in java, let's see the Method Overloading vs Method Overriding in java with examples, there is given a list of main differences between Method Overloading and Method Overriding.

    Difference between method overloading and method overriding in java

    There are many differences between method overloading and method overriding in java. A list of differences between method overloading and method overriding are given below:

    No. Method Overloading Method Overriding

    1) Method overloading is used to increase the readability of the program. Method overriding is used to provide the specific implementation of the method that is already provided by its super class.

    2) Method overloading is performed within class. Method overriding occurs in two classes that have IS-A (inheritance) relationship.

    3) In case of method overloading, parameter must be different. In case of method overriding, parameter must be same.

    4) Method overloading is the example of compile time polymorphism. Method overriding is the example of run time polymorphism.

    5) In java, method overloading can't be performed by changing return type of the method only. Return type can be same or different in method overloading. But you must have to change the parameter. Return type must be same or covariant in method overriding.

    Java Method Overloading example

    class OverloadingExample{

    static int add(int a,int b){return a+b;}

    static int add(int a,int b,int c){return a+b+c;}

    }

    Java Method Overriding example

    class Animal{

    void eat(){System.out.println("eating...");}

    }

    class Dog extends Animal{

    void eat(){System.out.println("eating bread...");}

    } ← Prev Next →

    स्रोत : www.javatpoint.com

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