#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
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