Method Overloading Tccicomputercoaching.com

Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java.

Java supports object oriented concepts like inheritance, Polymorphism, Data Abstraction, Encapsulation etc…….

Polymorphism means more than one form. It contains method overloading in Java.

What is Method Overloading?

If a class have multiple methods by same name but different parameters, it is known as Method Overloading.

Why do we use Method Overloading?

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

Suppose you have to perform addition of the given numbers but there can be any number of arguments, if you write the method such as a(int,int) for two parameters, and b(int,int,int) for three parameters then it may be difficult for you as well as other programmers to understand the behaviour of the method because its name differs. So, we perform method overloading to figure out the program quickly.

But there are some rules to be followed:

Must change the argument list

Can change the return type

Can change the access modifier

Can declare new or broader checked exception

Different ways to overload the method

There are two ways to overload the method in java

·         By changing number of arguments

·         By changing the data type

Example of Method Overloading by changing no of arguments:

public void add(inta, intb)

 {

                        System.out.println(“In method with two argument”);

            }

        //Overloaded method with one argument

            public void add(inta) {

                        System.out.println(“In method with one argument”);

            }

How to run method overloading?

add(3,5);

add(10);

First method with two arguments calls first add (3, 5) method. Second method with one argument calls second method (10).

Example of Method overloading by different data types:

class Calculation2

{

  void sum(int a,int b)

{System.out.println(a+b);}

  void sum(double a,double b)

{System.out.println(a+b);}

  public static void main(String args[]){

  Calculation2 obj=new Calculation2();

  obj.sum(10.5,10.5);

  obj.sum(20,20);

  }

}

Output: 21.0

        40

Example3: Overloading – Sequence of data type of arguments

Here method disp() is overloaded based on sequence of data type of arguments – Both the methods have different sequence of data type in argument list. First method is having argument list as (char, int) and second is having (int, char). Since the sequence is different, the method can be overloaded without any issues.

class DisplayOverloading3

{

public void disp(char c, intnum)

   {

System.out.println(“I’m the first definition of method disp”);

   }

public void disp(intnum, char c)

   {

System.out.println(“I’m the second definition of method disp” );

   }

}

In short, Method Overloading increases the readability of programme.

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