(i) Class and objects
(ii) Abstraction and encapsulation
(iii) Application program and applet program
- 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.
- 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.
- 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.
