#4.3 Java Tutorial | Constructor Example

Whenever you see round brackets in Java, it simply means that it is a method.

Constructor:
A constructor is a block of codes similar to the method. It is called when an instance of the class is created.
- It is a special type of method that is used to initialize the object.
-Whenever you create an object by saying new calc that calc and bracket is a constructor.
- Constructor is very important when you create an object.
- To call the constructor, we follow the syntax:
Calc obj= new Calc();
- By default, java gives you one constructor for the class with no parameters as it gives for Calc.
- The constructor with Java allocates the memory, thus it is used for allocating the memory.
- Java calls a default constructor if there is no constructor available in the class.
- We can also define our own constructors.
- We can also have two constructors in the same class provided they have a different signature.
- While creating an object if you pass a value, it will call that particular constructor which takes a value of its data type and it will assign that value to the constructor.
- You have to match the parameters as the number of values you are passing.

The syntax for defining constructor:
public Calc()
{

}

Point to remember about constructor:
- Constructor has the same name as a class name.
- Constructor does not return anything, so we do not specify the return type in a constructor.
- We do not need to call the constructor, it will be called automatically when the object is created.

Types of Constructors:
- A constructor with parameters is known as a Parameterized constructor.
- A contructor with no parameters that are given by Java is known as a Default constructor.

In this video we will see :
- What is constructor
- Example of Constructor
- How to create constructor
- Default constructor
- Characteristics of Constructor
- Assigning value through constructor
- Parameterized Constructor
- Constructor overloading

More Learning :

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[bhaskarbharati]

Within two minutes, he clarifies the concept of Constructor. I watched almost all the videos. He always talks specifically on the topic nothing extra bugs lol. He is really smart and thanks for all those videos.

[chaithanchaithan]

Started watching the video without any interest ..while listening unknowingly i got the interest to complete the video. The way of teaching by you made me to gain intrest on coding...Finally i want to tell something "Everyone one can teach..but only few make u to understand and give the confidence " like you sir.

[carlosriveraramirez]

Thank you so much. This was so well-explained and answered pretty much all of my questions about constructors.

[nano]

u don't know the happiness when I found a subject that YOU teach! man ur the best, god bless u

[milaismyname]

You motivate me so much to learn programming! Smth that my professor doesn`t...

[gmailuser]

Man you are so great! I loved watching your videos. Your videos helped me a lot hoping that I would pass my interview for the java entry level position!

[mymanishakakarla]

Sir .. it was amazing ... Ur teaching was clear and easy to understand.. its very helpful... Thanks

[streamtree]

Beautiful. This is upper level information on how to use constructors effectively. Thank You Much.

[adityaparkhe]

Best and simplest video on constructors.

[vijdon]

Navven - subtitles are blocking to see program when explained

[baazkabaazka]

thank u pro you are real teacher of java the best teacher

[msd]

Why did you used obj.num in 25 th line

[aydenrl]

Most insane tutorial ever tysm that was awesome!!! I didn't get this until now

[ducnguyen-hdeh]

I'm a bit confused to why do we need a constructor again
at 2:05 if we do int num1 = 5;
then run the program, the result will be 5. so whats the difference between having an constructor and not having one like this?

[vidhyavm]

Wow what a nice way to teach ...gr8...

[hsar]

Loved your way of teaching sir..very helpful...can you please make video on difference between static and final keyword

[vladanulardzic]

Practical explanation, easy to understand, wide & great knowledge you have. A talented teacher you are. Thank you. Keep on...

[yamisingh]

now i know the constructor thank you so much sir!

[superbtel]

ultimate explanation sir.keep doing videos on cse all subjects.thank you so much sir

[VISHNUPRIT]

In parametered construcor..we use this keyword ..right?