Constructor

• Constructor  is special type of methods whose name is constructor.
• Constructors are executes automatically when object of the class is created.
• Always Constructor’s visibility is public.
• 2 types.

1. Instance constructor.
2. Static constructor.

• Instance constructor called automatically when object is created.
• Instance constructor can be called as per number of objects are created.
• Instance constructor can be called method name "CONSTRUCTOR".
• An instance constructor can have IMPORTING parameters and exceptions. You must pass all non-optional parameters when creating an object.

• Static constructor can be called only once when class has been loaded.
• Static constructor has 1st priority than Instance Constructor.
• Static constructor can be called  method name " CLASS_CONSTRUCTOR".
•  Static constructors have no parameters.