T11: Knowledge Tip Of The Day.....
How To Declare a class
How To Declare a class
Declaration of Class:
A class is declared by use of the class keyword. The class body
is enclosed between curly braces { and }. The data or variables, defined within
a class are called instance variables. The code is contained within methods.
Collectively, the methods and variables defined within a class are called
members of the class.
Declaration of Instance Variables :
Variables defined within a class are called instance variables
because each instance of the class (that is, each object of the class) contains
its own copy of these variables. Thus, the data for one object is separate and
unique from the data for another. An instance variable can be declared public
or private or default (no modifier). When we do not want our variable’s value
to be changed out-side our class we should declare them private. public variables
can be accessed and changed from outside of the class.
Declaration of Methods :
A method is a program module that contains a series of
statements that carry out a task. To execute a method, you invoke or call it
from another method; the calling method makes a method call, which invokes the
called method. Any class can contain an unlimited number of methods, and each
method can be called an unlimited number of times.
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