A class should always have a constructor. The constructor initiates the data members.

The keyword this references to current class data members.

Structure of a class:

1. includes
2. parameters
3. constructor
4. methods

Hint: Always pass values in the main method (via constructor).

Class default modifier = internal (= accessible from other classes).

Instantiating an object:

Dog dog = new Dog(); 

• dog = reference variable, it references to the heap where the object is created
• new Dog() = new object

Dog tanny;

• tanny = only reference, NOT the object

No object is created here in the second example.