Constructor in Java

Constructor - 

• A constructor is special program which is use to create object often class. 
• It is invoke using new keyword. 
• It is use to the sign memory to new created object. 
• The name of constructor is the name of class but there is no return datatype.

   Threre are many type of constructor :

1. Default constructor
2. Copy constructor 
3. Argument constructor 

Default constructor - 

• The simplest kind of constructor that a class can have is the one that has no parameter. 
• When you do not explicity define a constructor for a class, then Java creats a default constructor for the class. 
• The default constructor automatically initializes all instance variable.

General form - class name class-veriables (or)  object-name =new class name ()

Copy consructor -

•   A copy constructor is a constructor that replicates (or) duplicates an existing object. So, it is called the copy constructor. 
• It takes a parameter is a reference to an object of the same class to which the constructor depend. 

Examples- Triangle t1 = new triangle ();

Argument Constructor -

• We cannot add always the above two numbers, so we need values to be added. The easy solution is to add parameter to the constructor. 
• The default constructor is often sufficient for simple classes. It is not sophisticated ones. So, we need to declare the argument constructor, the default constructor is no longer used

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