Java Design Patterns A Tutorial phần 4 doc

... by designing a Façade (Figure 13.2) consisting of a Database class and a Results class, we can build a much more usable system. Figure 13.2. A Façade that encloses many of the java. sql.* classes. ... Employee(String _name, float _salary) { name = _name; salary = _salary leaf = true; } // public Employee(Employee _parent, String _name, float _salary) { name = _name;...

Ngày tải lên: 12/08/2014, 19:21

... 84 Java Beans as Bridges The Java Beans programming model is an ideal example of a Bridge pattern implementation. A Java Bean is a reusable software component that can be manipulated ... awtList. Pluggable Adapters A pluggable adapter is an adapter that adapts dynamically to one of several classes. Of course, the adapter can adapt only to classes that it can recognize,...

Ngày tải lên: 12/08/2014, 19:21

... each character is needed, rather than one for each appearance of that character. 115 Discussion A flyweight is a sharable instance of a class. At first glance, each class might appear ... are also useful when you are referring to large data systems outside of Java, such as databases. The Database class we developed previously in the Façade pattern could be a candidate for a...

Ngày tải lên: 12/08/2014, 19:21

... operations for later playback and just barely qualifies as a language; it might not actually have a written form or grammar. Languages such as VBA, by contrast, are quite complex but are far ... class Parser implements Command { private Stack stk; private Vector actionList; private KidData kdata; private Data data; private JawtList ptable; private Chain chain; public Par...

Ngày tải lên: 12/08/2014, 19:21

... illustrated by at least one complete visual Java program. This practical approach makes design pattern concepts more concrete and easier to grasp, brings Java programmers up to speed quickly, and ... Defining Design Patterns 14 The Learning Process 15 Studying Design Patterns 16 Notes on Object-Oriented Approaches 16 The Java Foundation Classes 17 Java Design Patt...

Ngày tải lên: 12/08/2014, 19:21

... The javax.comm Package as a Singleton The javax.comm package is provided separately from the Java Software Development Kit (SDK) and is downloadable from the Sun Web site. This package is designed ... you can define all of the methods in the base class, even if they don't always have an actual function. Or, if you can't change the base class, you can derive a new base cla...

Ngày tải lên: 12/08/2014, 19:21

... Select Groups Available Groups (Do not change) Displayed Fields Available Fields emp_name mgr_name SumSALARYPermgr_name SALARY Totals (Do not change) Labels All labels Change labels to be meaningful. Templates ... the Salary label, then click Align Right in the toolbar. 10. Now, format the Total Salary numbers in the same way you formatted the Salary numbers. 11. Add a space between the Ma...

Ngày tải lên: 08/08/2014, 20:21

... not have a standard GUI. Windows-based operating systems and MAC OS X are proprietary and have a standard GUI in each version. 14. Which of the following attributes are not available on files and ... (PnP) feature automatically detects them and the operating system automatically installs appropriate drivers. Adapter cards The installation of an adapter card depends on the card’s type and...

Ngày tải lên: 09/08/2014, 07:20

... same variable, shape — even though that variable was declared to be a shape object — and then called the draw method again to draw a rectangle. So you used the same variable, shape, to hold a ... Computer class. Creating a decorator You might start by creating an abstract class that all Computer class wrap- pers have to extend (remember, an abstract class is one that can’t be used to...

Ngày tải lên: 12/08/2014, 16:21

... code to add to the timecard. package com.wiley.compBooks.EJwithUML.TimecardUI; import javax.servlet.http.*; import javax.servlet.*; import javax.naming.*; import javax.ejb.*; import java. rmi.*; import ... java. rmi.*; import javax.rmi.PortableRemoteObject; import java. io.*; import java. util.*; import java. text.*; import com.wiley.compBooks.EJwithUML.Base.HtmlPrimitives.Core.*; Select...

Ngày tải lên: 12/08/2014, 16:21