Define rules of Constructors

• Its name must be same as "classname".
•  It must be defined as "public method".
•  It can be defined with/without arguments.
•  It can't return any value. So, no return type specification is required.
• "Constructor overloading" is possible. Writing multiple constructors in the same class is called as "Constructor overloading".

Define “this” Keyword

This is similar to ―this pointer in C++.
 It represents current working object.
 It is used to access the members of current working object.

• this.field
• this.property
• this.method()

Current object: The object, with which object, the method is called.
“this” keyword can‘t be used in the static methods, because static methods doesn‘t have current object.