Java

This article mainly introduces the configuration of basic parameters and application examples of apache-dbcp. Currently, the latest version of dbcp is 1.4 and needs to be run in the jdk1.6 environment. If you want to run in the jdk1.4 and 1.5

1. @ Model note solution usage@ Model note:Make the bean have a request-scoped cycle (take the @ dependent recognized by the proxy)Give bean an EL nameCreate a bean that asks for an example and assigns it a name, just like a class labeled with @

1. Use multiple @ Qualifiers at the same injection point to perform the following steps:You can use multiple restricted injection solutions to divide your injection targets in one step.We have fixed the limit to explain SuperFast and

  Several examples of String constant pool problemsThe following is a comparative analysis and understanding of several common examples: String a = "a1"; String B = "a" + 1; System. out. println (a = B); // result = true String a = "atrue"; String B

  Invalid, valid, and well-formatted documents There are three types of XML documents: Invalid document: does not comply with the syntax rules defined in the XML specification. If a developer has defined what a document can contain in a DTD or mode

Java data type: a strong type language. The first time a variable is declared, it must indicate the data type. The first value assignment is called the initialization of the variable.   Category: 8 basic types (native type): INTEGER: byte Byte type 1

After J2SE5.0, the automatic packing and unpacking functions were introduced to improve our development efficiency. However, automatic packing and unpacking are actually supported by the compiler (not the language itself, or virtual machine ),

Refer to the security chapter of java ee 6 tutorial for study notesJava ee applications are divided into multiple tier (layers), the client layer is a browser, the web layer is jsp, jsf, and so on, the business layer is ejb, And the db layer is jpa,

  1. Add the hover effect to the menu item     Books Web Development BI Development Web Test 2. Fold-over menu     Books Web Development BI Development Web Test   Moive American

  The data defined in the class becomes the data member of the class, such as fields and constants. Function member methods provide data operations, such as function member methods, attributes, and constructors. Data members and methods in objects

Sorting algorithms seem to be the algorithms that programmers learn the most in programming, or they may be algorithms that algorithm researchers like most. There are many sorting algorithms, such as bubble, insert, selection, heap, fast, and merge.

Abstract class and interface support the definition of abstract classes in Java. The existence of these two mechanisms gives Java powerful object-oriented capabilities. Abstract class and interface have great similarity in support for the definition

Assume that the task is like this: for a given string, such as "threadTest", give it another "@" and return the result. There is no dependency between these tasks.   Assume that there are many such strings, such as 1000, and the number of threads

  Add a file header to add the form label of Spring to jsp.   First Name: Last Name:   CommandName = "user", so the attribute of this page must have the user attribute, and the value corresponding to the user attribute must

  When performing a performance test, I found a problem with an MD5 tool class. under heavy pressure, I encountered a computing error. I analyzed the code and found the cause. Here is the original code:   Public class MD5 {   // ---------------------

  Sington class serialization To change the Singleton class to serializable, it is not enough to implement the Serializable interface only. To maintain Singleton, you must provide a readResolve method for the Singleton class. Otherwise, a serialized

Int result = (integer=gethibernatetemplate(cmd.exe cute (new HibernateCallback (){   Public Object doInHibernate (Session session ){   Connection conn = session. connection ();   CallStatement smt = conn. prepareCall ("{call procename (?,?,?)}

  /** * Obtain the system time * @ Return */ Public String getDate (){   Calendar ca = Calendar. getInstance (); Int year = ca. get (Calendar. YEAR); // obtain the year Int month = ca. get (Calendar. MONTH); // get the month Int day = ca.

This article mainly references Addy Osmani's PPT "How to Improve jQuery's Performance" (jQuery Proven Performance Tips And Tricks ). He is a member of the jQuery development team and has a certain degree of authority. His conclusions are all

Public class Tools {Public static boolean arrayEquals (String [] a, String [] B ){Boolean flag = false;If (a. length! = B. length ){Return false;} Else {For (int I = 0; I System. out. println (a [I] + "\ t" + B [I]);If (! A [I]. equals (B [I]) {Flag