Java

This article is a summary of the study of the article on the network, thank you for your selfless sharing.1 , Factory mode is the most useful design mode. It is a creative model, and his purpose is to create objects of one or several classes of

TheQuicksort Quick-LinevoidQuickSort (int[] L,intLeftintRight ) { if(leftRight )intpivotpos=partion (l,left,right); QuickSort (L,lefft,pivotpos-1); QuickSort (L,pivotpos+1, rigth);}intPartitionint[] L,intLowintHigh ) { intpivotpos=Low ;

Singleton mode, 1) a static variable to record a unique instance of the Singlegton class. 2) Private construction method. 3) The GetInstance method instantiates the object and returns the instance.1, first look at the classic single-case pattern of

The full name of PermGen space is permanent Generation space, which refers to the permanent storage area of memory. This section is used to store class and meta information, and class is placed in the PermGen space area when it is loaded, unlike the

1. Open My Computer--Properties--advanced--environment variables2. New System Variables Java_home and classpath variable name: java_home Variable value: C:\Program files\java\jdk1.7.0 Variable name: CLASSPATH Variable value:.;

1 Importjava.beans.PropertyChangeEvent;2 ImportJava.beans.PropertyChangeListener;3 ImportJava.beans.PropertyChangeSupport;4 5 Public classDemobeans {6 7 PrivateString Demoname; 8 PrivateString Version; 9Propertychangesupport listeners

The best way to learn the program is to make code to achieve it, here we assume a scene for a party, the party process is: 1. The party begins; 2. Singing; 3. Dance; 4. Sketch; 5 ends.I. Traditional methods1. New Java Project: party2. New class

Transferred from: http://shuyangyang.blog.51cto.com/1685768/103076————————————————————————————————————What is a generic type?Generics (Generic type or Generics) are an extension of the Java language type system to support the creation of classes

Image binarization Based on Java, java image binarization I have been unable to process the graph processing capability table of Java for a long time, but it seems that this is not the case. I have used PHP for some applications and involved in

Classic String str = new String ("abc") memory allocation problem, stringstr From: http://blog.csdn.net/ycwload/article/details/2650059 Today, I am looking for some knowledge related to storage management. I haven't found any perfect information on

Java. util. concurrent package source code reading 16 special BlockingQueue: SynchronousQueue, java. util package SynchronousQueue is a special BlockingQueue. Any operation to add an element must wait until another thread takes the element away.

Dynamic call of methods in struts_2_Action class (1) directly call the method (not recommended) 1) Action class:   private String savePath;public String getSavePath() {return savePath;}public void setSavePath(String savePath) {this.savePath =

Constant configuration in struts2_5_struts Constants can be configured in two ways: 1) Configure in struts. xml: (this configuration method is recommended) 　　 2) Configure constants in struts. properties: 　　truts.action.extension =

Struts2_4 _ is the injection value of the Action attribute. Struts2 provides the dependency injection function for the attributes in Action. In the configuration file of struts2, You can inject values for the attributes in Action. The attributes

Original Interpreter mode (Interpreter Pattern) Interpreter mode definition(It is rarely encountered in real projects, so the theory goes first ...) The interpreter mode is a solution for parsing according to the prescribed syntax, which is rarely

Java basic consolidation series (4): array reflection applications For arrays, We can print all objects in the array through reflection: Package com. test; import java. lang. reflect. array; import java. lang. reflect. field; public class

Benefits of design patternsFlyweight)Use the sharing technology to effectively support a large number of fine-grained objects. Do you still remember the five games you 've played on the text? Wuziqi is a pure strategy-based chess game between two

Ajax journey (iii) -- asynchronous update In the previous blog, I have already explained in theory what is the XMLHttpRequest object, which is the core object for Ajax asynchronous update. Next, we will use an instance to understand how to use the

Binary Search TreeThe following figure shows two binary search trees. We can summarize their features: (1) if its left subtree is not empty, then the value of all the nodes on the left Tree is smaller than the value of its root node (2) if its right

Java syntax ---- difference between equals and = in Java[Body] When I was learning the Android and Java languages, I always met the two characters "equals" and "=", which I always felt similar. In fact, there are still some differences, today, I