Method Overriding VS Method Overloading in Java

• Method Overriding allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its superclasses or parent classes.

• Method Overloading is the ability to create multiple functions of the same name with different implementations.

Method Overriding in Java OOP

/**
 * @author lautturi.com 
 * Java example: Method Overriding example in java
 */

import java.util.*;

class Animal {
	void show() {
		System.out.println("An Animal");
	}
}

class Dog extends Animal {
	void show() {
		System.out.println("A Dog");
	}
}

public class Lautturi {
	public static void main(String args[]) {

		Animal obj1 = new Animal();
		obj1.show();
		
		Dog obj2 = new Dog();
		obj2.show();
		
		Animal obj3 = new Dog();
		obj3.show();

	}
}

output:

An Animal
A Dog
A Dog

Method Overloading in Java

/**
 * @author lautturi.com
 * Java example: Method Overloading example in Java
 */
 
import java.util.*;
 
public class Lautturi {
    private static void plus(){// no parameter
        System.out.println("plus method with no parameter is called");
    }
     
    private static int plus(int i,int j){// integer parameter
        System.out.println("int plus method is called");
        return i+j;
    }
     
    private static double plus(double i,double j){ // double parameter
        System.out.println("double plus method is called");
        return i+j;
    }
     
    public static void main(String[] args) {
         
        plus();
        System.out.println(plus(2,3));
        System.out.println(plus(1.41,3.14));
 
    }
}

output:

plus method with no parameter is called
int plus method is called
5
double plus method is called
4.55