(i) Class and object
A class is a blueprint
that describes characteristics and functions of entity.. For example, the class
Dog would consist of traits shared by all
dogs. A class is collection of the properties and methods are called members.
Object is an instance of class.
Data abstraction: - it is a process that provides only
essential features by hiding its background details. A data abstraction is a
simple view of an object that includes required features and hides the
unnecessary details.
(ii)
Data
abstraction & Data encapsulation –
it is a process that provides only essential features by
hiding its background details. A data abstraction is a simple view of an object
that includes required features and hides the unnecessary details. it is a mechanism of bundling the data, and the functions that use
them and data abstraction is a mechanism of exposing only the
interfaces and hiding the implementation details from the user.
(iii)
Applet
vs Application program
Java Application:
·
A java application is a stand-alone
program. This means it can be run by itself.
·
It cannot access from web browser.
·
It is run by JVM.
·
It can access on local machine on which
program is reside.
Applet
·
Applet cannot run as independent program.
·
Applet program can run from within a web
browser or similar java enabled application such as an applet viewer
·
Java applets are included in HTML pages
using <applet> tag.
·
Applet communicates with server only.
·
Applets are not allowed to read or write
to files on the local system.
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