e-Commerce Applications Using Oracle8i and Java from Scratch

Java Classes

Classes are an essential part of any Java application or applet. Java is made up of a number of classes that are made available for general use with the help of the Java Development Kit (JDK). Objects are created as instances of a class, and these objects can include all the code of the class. In other words, you can consider a class as a template, and individual objects are created using that template.

Each Java class consists of two parts:

• Declaration— Java class declarations have the form

  [AccessSpecifier] class  NameOfNewClass [extends NameOfSuperClass]
  [implements NameOfInterface];
  

  where AccessSpecifier determines how the class can be used in development. Several access specifiers are allowed:

  Public/Protected—Public specifies ...