Java Design Patterns A Tutorial phần 3 doc

... 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 visually ... 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 recogni...

Ngày tải lên: 12/08/2014, 19:21

... 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. ... example program using this Façade pattern is the dbFrame .java program. This program, shown in Figure 13. 3 , accesses a database that contains food prices at three local mark...

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

... sophisticated, robust Java programs. This book presents the 23 patterns cataloged in the flagship book Design Patterns by Gamma, Helm, Johnson, and Vlissides. In Java( TM )Design Patterns, each of ... these patterns is illustrated by at least one complete visual Java program. This practical approach makes design pattern concepts more concrete and easier to grasp, brings...

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 ... 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 class that contains all of the methods t...

Ngày tải lên: 12/08/2014, 19:21

... Do Thái, chiếm Khaibar, Fadac, Wadil Cora, Taima. Thấy được Allah phù hộ, ông dắt theo hai ngàn kị binh hiên ngang hành hương ở La Mecque. Danh ông vang lừng khắp miền Hedjaz. Các bộ lạc ở ... lỗ mãng như vậy k a? Nó ch a ra khỏi sa mạc, ch a biết Quốc vương Ba Tư ra sao mà! Chosróè II, vua Ba Tư, xé bức thư c a Mohamed. Mohamed quát: "Vương quốc c a nó sẽ tan tành cho mà coi...

Ngày tải lên: 26/01/2014, 19:20

... notify(0 và wait(): Chương trình 8.6 import java. applet.*; import java. awt.*; import java. awt.event.*; /*<applet code = “mouseApplet” width = “100” height = “100”> </applet> ... public class Deadlock implements Runnable{ public static void main(String args[]){ Deadlock dlk1= new Deadlock(); Deadlock dlk2 = new Deadlock(); Thread t1 = new Thread(dlk1); Threa...

Ngày tải lên: 31/07/2014, 01:20

... 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 shape ... 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

... specification. It all starts by creating that factory specification, and I do that with an abstract factory class. Creating an abstract factory Creating the abstract factory class is easy. This class ... in Java. That’s how Java structures its file system classes — as decorators. Do you want to read data in a buffered way? You might take a look at a basic file-reading object, an Inpu...

Ngày tải lên: 12/08/2014, 16:21