Java

Java is used to operate Excel tables. Only poi is known before. Poi is a sub-project of Apache. It mainly provides a set of Java APIs for Operating Windows documents. There is also a jxl (Java Excel), which is also an open-source project. It feels

Similar to the QQ login function, the account has been logged on in one place, and the previous login will be squeezed out during another login. Principles: It mainly processes user logon in servlet. servlet maintains the relationship between user

The following is the threadlocal test code. For more information, see note Package COM. jadyer. thread. local; import Java. util. random; /*** threadlocal test * @ see ================================== ==============================================

/** title: ** Description: ** copyright: Copyright (c) 2007 ** company: ** @ Author ifwater* @ Version 1.0*//* The CA should use its own private key to issue a digital certificate. The CA's certificate does not contain information about the

Environment: RedHat LinuxJdk5.0 Function Description: A Java program is executed at two o'clock every morning to read data from the Oracle database for backup. Procedure: 1. First, package the Java program into a jar package named auto. Jar. Be sure

Dynamic proxy, as an extension form of proxy mode, is widely used in the design and development of frameworks (especially the AOP-based frameworks). This article will explain the implementation process of Java Dynamic proxy through examples. Tip:

Loop and string processing are worth noting during system performance optimization. In terms of mentality, we must not put our own eyes on ten or hundreds of cycles, nor treat the strings we want to process as ten or twenty characters. Every time a

We all know the verification code. I don't need to say much about its role. If you are not quite clear, refer to the explanation in Baidu encyclopedia. Generally, the generation of verification codes generates random characters (numbers, letters, or

I have played some Java mobile games on the market, and found that many games have problems with key processing. They are either insensitive or do not support simultaneous pressing of multiple keys. as a hardcore professional game player, I really

Public class prefixtrie { // supports 7-bit chars. Private Static final int size = 128; node root = new node (); Public void put (string prefix, object value) { node current = root; //.... } Public object get (string key) { node current = root;

I used to encounter this error when I used to patch Bi java. If there are different solutions on the Internet, I 'd like to share my solutions with you:   Cannot login to the SAP J2EE Engine UsingUser and password as provided in the filesystem

The following two classes can easily encrypt and decrypt strings: Encryption: crypthelper. Encrypt (password) Decryption: cryphelper. decrypt (password)   The Code is as follows: Cryptutils. Java Package COM. gdie. lab. crypt; import Java. io.

Java list sorting collections. Sort () sorting list // A pojo example Class user {String name;String age; Public user (string name, string age ){This. Name = Name;This. Age = age;}Public String getage (){Return age;}Public void setage (string age

Http://bbs.dev.ccidnet.com/read.php? Tid = 586331  Introduction A domain-specific language (DSL) is usually defined as a computer language that specifically targets certain special problems. It is not intended to solve non-domain problems. The

Previous Article: Java thread (6) Lock is the interface under the java. util. Concurrent. Locks package,LockThe implementation providesSynchronizedMore extensive lock operations can be obtained by methods and statements. It can handle thread

Question proposal An important advantage of Java is that the garbage collector (garbage collection, GC) automatically manages memory collection. programmers do not need to call functions to release the memory. Therefore, many Programmers think that

Original: http://topic.csdn.net/u/20090519/18/7b8cf7ef-bc06-4d26-8a2c-692eb0562231_2.html   Author: zangxt The string class is a very important class in Java. Here we will summarize the special features of this class. The following documents are

ZThe latest update environment has always prompted unable to execute DEX: Java heap space in eclipse. solution: I. modify the eclipse. ini1. open eclipse. ini2. add-VMD: \ Java \ jdk1.6.0 _ 24 \ bin \ javaw.exe (change to your own JDK directory) at

1. Read the image to the byte [] stream 2. Transfer byte [] to base64 encoding (that is, a bunch of strings), put the strings in XML, and the images can be transmitted with XML. 3. decodes the base64 encoding in XML into a byte [] stream and then

Ndk make: *** no rule can be created $ Ndk/ndk-build The above error is generally because Android. mk in your JNI file contains spaces that are not suitable. There may be many reasons for this problem.If this problem occurs, check the Android. mk