data structures abstraction and design using java

"Copyright Declaration" Reproduced please indicate the source (please respect the original, bloggers retain the right to investigate)http://blog.csdn.net/javazejian/article/details/53362993From "Zejian's blog." Related articles: Design and implementation analysis of sequence table and link list of Java Data structure and algorithmDesign and implementation of two-

();Notifyobservers (state); } @Override public void Notifyobservers () {super.notifyobservers ();}}======================================Package com.bjsxt.cn.observer2;Import Java.util.observable;import java.util.Observer;public class Observera implements Observer {private int state; public int getState () {return state;}public void SetState (int.) {this.state = state;}@Override public void Update (Observable arg0, Object arg1) {setState (((ConcreteSubject) arg0). GetState ());}}===============

following topologies: As a source, as a target, as a translator, as a lookup phase. The DataStage Java Pack is a collection of two plug-in phases (Java Transformer and Java Client) that can be used to invoke Java applications in DataStage. The Java Pack is available in Dat

correctly by the system. 9, do not write some meaningless queries, such as the need to generate an empty table structure: Select Col1,col2 into #t from T where 1=0 such code will not return any result set, but will consume system resources, Should be changed to this: Create TABLE #t (") 10, a lot of times with exists instead of in is a good choice: Select num from a where num in (select num from B) Replace with the following statement: Select Num from a where exists (select 1 from b where num=a

SNS games are basically the use of HTTP short connection, using Java to develop the server can use the Servlet+tomcat very easy to start the service side of the architecture. Here is a good use of a servlet design, I have seen a lot of HTTP request-based game server using Struts, Spring, hibernate and so on, in fact, I

A good design for using Servlet and Java annotations on the game server SNS games basically use HTTP short connections. When using Java to develop the server, you can use Servlet + Tomcat to easily start the server. Here we will introduce a better

, Department, role, etc.3. Rules: Conditional rules for "Data permissions"Here the side re-analysis of the subject and rules, the subject has a hierarchical relationship. Be able to set different rules for different subjects, for example: The current data is only valid for the creator (or someone), the permissions of the subordinate principals are equally valid for the parent principal (configurable, as can

to think too much about getting a pixel of an image, but if you want to set a pixel, and the data type or bit width of the pixel is less than the width you want to set, you have to be aware of it, but it's safer to use the double setting and automatically convert it internally. You will see in the Java version of the OpenCV method in many places are using a doub

test will know.2. The test program just realizes the function, but put in your project program must be a lot of testing nature will find the problem, this test code in your project when you must pay attention to some code transformation, specific self-test to find. Can be simply explained under the executive () This method inside the code as long as a little transformation is good, their own groping under the understanding.3. Control file path This is best used when referencing to a project: co

Com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; /** * Two-dimensional Code tool class */public class Qrcodeutil {private static final String CHARSET = "Utf-8"; private static final String Format_name = "JPG"; Two-dimensional code size private static final int qrcode_size = 300; Logo width private static final int width = 60; Logo height private static final int height = 60; private static BufferedImage CreateImage (string content, String Imgpath, Boolean needcompress) throws Exceptio

Java-Cache hotspot data, using algorithms at least recently, java-hotspot 1. Least recently used algorithm LRU (Least recently used, Least recently used) [Implementation]: The most common is to use a linked list to save cached data. 1. Insert new

subtrees that are currently in use, and only one Shang tree can find success.4. The most important is the design of the TreeNode class: public class TreeNode { char val; int min; Treenode[] Next; TreeNode (char c) { val = c; Next = new treenode[26]; } The most important of these is the TreeNode constructor, when we execute Next = new TREENODE[26]; , we just declared the size of t

The back end also has a Java user object class that serializes the user object in the list into XML data using the XStream component. obtained using the E4X format format on the flex side via Httpservice. Just started to parse XML by E4X technology, and construct flex user object, similar to the way it was handled: