method overriding in java | method overriding in java with realtime examples

      Method Overloading in Java

If a class has multiple methods having same name but different in parameters, it is known as Method Overloading.

If we have to perform only one operation, having same name of the methods increases the readability of the program.

Methods are used in Java to describe the behavior of an object. Methods are a collection of statements that are group together to operate. In Java, it is possible to create methods that have the same name, but different argument lists in various definitions, i.e., method overloading is possible in Java, which is one of the unique features of Object Oriented Programming (OOP).

an example where you can perform multiplication of given numbers, but there can be any number of arguments a user can put to multiply, i.e., from the user point of view the user can multiply two numbers or three numbers or four numbers or so on. If you write the method such as multi(int, int) with two parameters for multiplying two values, multi(int, int, int), with three parameters for multiplying three values and so on. A programmer does method overloading to figure out the program quickly and efficiently. Method Overloading is applied in a program when objects are required to perform similar tasks but different input parameters. Every time an object calls a method, There are different ways to overload a method in Java. They are:

   1.    Based on the number of parameters: In this case, the entire overloading concept depends on the number of parameters that are placed within the parenthesis of the method.

    2.    Based on the data type of the parameter: With the arrangement of data type, within the parameter, overloading of the method can take place.

3.    Based on the sequence of data types in parameters: The method overloading also depends on the ordering of data types of parameters within the method.

   4.    To create overloaded methods, programmers need to develop several different method definitions in the class, all have the same name, but the parameters list is different. Here is a sample code snippet:

method overriding in java

Advantage of method Overloading

    ·         It is used to perform a task efficiently with smartness in programming.

    ·         It increases the readability of the program.

  ·         The Method overloading allows methods that perform proximately related functions to be accessed using a common name with slight variation in argument number or types.

  ·         They can also be implemented on constructors allowing different ways to initialize objects of a class

Disadvantage of method Overloading

  ·         It's esoteric. Not very easy for the beginner to opt this programming technique and go with it.

  ·         It requires more significant effort spent on designing the architecture (i.e., the arguments' type and number) to up front, at least if programmers' want to avoid massive code from rewriting.

Syntax:

public class Student {

    public void add(int i, int j) {

        ....

    }

    public void add(int i) {

        ....

    }

}

Example:

class Multiply {

    void mul(int a, int b) {

        System.out.println("Sum of two=" + (a * b));

    }

    void mul(int a, int b, int c) {

        System.out.println("Sum of three=" + (a * b * c));

    }

}

public class Polymorphism {

    public static void main(String args[]) {

        Multiply m = new Multiply();

        m.mul(6, 10);

        m.mul(10, 6, 5);

    }

}

Output:

Sum of two=60

Sum of three=300