Constructor overloadingIFRAH

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What is Constructor overloading? Constructor overloading in java allows having more than one

constructor inside one Class. overloading is not much different than method overloading. Just

like in the case of method overloading you have multiple methods with the same name but different signature mean paramete,

in Constructor overloading you have multiple constructors with a different signature with the only difference that Constructor doesn't have a return type in Java. That constructor will be called as an overloaded constructor . Overloading is also another form of polymorphism in Java which allows having multiple constructors with a different name in one Class in java.

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Why do you overload Constructor in Java ?

When we talk about Constructor overloading, the first question comes to mind is why do someone overload Constructors in Java or why do we have overloaded constructor ? If you have been using framework or API(Application Programming Interface) like JDK(Java Development Kit)  you must have seen a lot of method overloading and constructor overloading. Constructor overloading makes sense if you can Construct object via a different way.

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How to overload Constructor in Java?

Constructor overloading is not complex you just need to create another constructor, obviously same name as of class but different signature but there are certain rules related to Constructor overloading which needs to be remembered while overloading constructor in Java.

e.g. One Constructor can only be called from inside of another Constructor and if called it must be the first statement of that Constructor. here is an example of correct and incorrect constructor overloading

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Important points related to Constructor overloading

1. Constructor overloading is similar to method overloading in Java.

2. You can call overloaded constructor by using this() keyword in Java.

3. overloaded constructor must be called from another constructor only.

4. make sure you add no argument default constructor because once compiler will not add if you have added any constructor in Java.

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Important points related to Constructor overloading

5. if an overloaded constructor called , it must be the first statement of constructor in java.

6. Its best practice to have one primary constructor and let overloaded constructor calls that. this way

your initialization code will be centralized and easier to test and maintain.

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biggest advantage of Constructor overloading

That’s all on Constructor overloading in java. The biggest advantage of Constructor overloading is flexibility which allows you to create the object in a different way and classic examples are various Collection classes. Though you should remember that once you add a constructor, a compiler will not add default no argument constructor.

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public class Syntax { public static void main(String[] args) { Hacker obj1 = new Hacker (); Hacker obj2 = new Hacker (111); } } class Hacker { Hacker () {

System.out.println("Constructor Overloading Example");}

Hacker (int x) { System.out.println ( x);

}}

Main Class

Main Method This is object creation for First Constructor

This is object creation for 2nd Constructor

We create new class

First ConstructorDefault

Second Constructor ConstructorDefault

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In program

We make two object, one for default and second for parameters construct.

We make unlimited constructor in program but the parameter of constructor does not same. Otherwise program give the error.

For every constructor we make create separate object. And give the same value that we data type we use in constructor.

Example: Check the second constructor and second object. We give int data because we use int data type.

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