THE DESIGN PATTERNS JAVA COMPANION
1. Creational Patterns 17
The Factory Pattern 18
How a Factory Works 18
Sample Code 18
The Two Derived classes 19
Building the Factory 20
Factory Patterns in Math Computation 22
When to Use a Factory Pattern 24
Thought Questions 25
The Abstract Factory Pattern 26
A GardenMaker Factory 26
How the User Interface Works 28
Consequences of Abstract Factory 30
Thought Questions 30
The Singleton Pattern 31
Throwing the Exception 32
Creating an Instance of the Class 32
Static classes as Singleton Patterns 33
Creating Singleton Using a Static Method 34
該程序?yàn)镚PS數(shù)據(jù)采集程序，AppWizard has created this GPS application for you. This application
not only demonstrates the basics of using the Microsoft Foundation classes
but is also a starting point for writing your application.
This file contains a summary of what you will find in each of the files that
make up your GPS application.
本教程舉例說明了如何使用 ADO 編程模型對數(shù)據(jù)源進(jìn)行查詢及更新。教程首先講述了完成此項任務(wù)的必要步驟，然后分別通過 Microsoft Visual Basic、以 VC++ Extensions 為特征的 Microsoft Visual C++、Microsoft Visual Basic、Scripting Edition 和以 ADO for Windows Foundation classes (ADO/WFC) 為特征的 Microsoft Visual J++ 進(jìn)行更為具體的說明。
Produce a Java program to calculate the value of π in two different methods proposed by Francois Vieta and John Wallis. Design and implement a super-class Estimation two sub-classes (FrancoisVieta and JohnWallis) and an application class.
Whenever there is an application to write, breaking it up to small pieces is a great idea. The smallest piece of any application would probably be a data object, or a simple Bean in Java. Java Beans are simple Java classes that have a distinctive look and behavior. Their simplest purpose is to contain data and they accomplish this by having properties. Each property is actually a data-member containing/referencing the actual data and a couple of methods, a getter method and a setter method. Thus, the simplest data-bean describing a person could be expressed as such:
