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Network programming tutorial

CSS comment syntax

CSS comment syntax: After a style sheet is created, often weeks, months, or even years later, when you go back and make modifications, you may not be able to figure out why you created this style before, and What exactly does it do. This is true for any p

2024-11-21
Java string subtraction (a very simple method)

There is a relatively simple method: copy the code as follows: str1="abcd";str2="cd";str3=str1.replaceAll(str2,"");//str3="ab"

2024-11-20
Example code for filling text boxes based on ID

Front desk: Copy the code as follows: <script type="text/javascript">function func_load_remark(sr_id){if(sr_id!=0){$.getJSON("loadSrRemark.do?date

2024-11-20
A brief analysis of the solution to the problem of Incompatible JVM when opening eclipse

After installing the oracle10g client, eclipse cannot be opened. So I checked and found out the following reasons. The following error occurs when running eclipse: Incompatible JVMVersion 1.3.1_01 of the JVM is not suitable

2024-11-20
In-depth explanation of quick sort and java implementation

Quick sort is widely used as an efficient sorting algorithm. The Arrays.sort method in SUN's JDK uses quick sort. Quick Sort adopts the classic divide and conquer idea: Divide: Select a primitive X (generally select the first element of the array), an

2024-11-20
Parsing Neatbeans (common errors) build-impl.xml:305: Compile failed

First, paste a section of build-impl.xml that contains the configuration copy code of the line where the javac part failed to build. The code is as follows:<sequential><property location="${build.dir}/empty" name="empty.dir"/>

2024-11-20
A brief analysis of JAVA's commonly used JDBC methods to connect to the database summary

1. The JDBC connection DB2 copy code is as follows: Class.forName("Com.ibm.db2.jdbc.net.DB2Driver"); String url="jdbc:db2://dburl:port/DBname" cn = Driv

2024-11-20
Parse web.xml to obtain the parameters in context-param and init-param in Servlet

Two kinds of parameters can be defined in web.xml: 1. Parameters within the application scope are stored in the servletcontext and are configured as follows in web.xml: Copy the code as follows:<context-param><param-name> context/para

2024-11-20
Introduction to common methods in ServletContext

1. Obtain the initialization parameters of Tomcat's Context. 1. Obtain the initialization parameters of Context set in Tomcat's server.xml. For example: copy the code as follows:

2024-11-20
How to install apk software on AVD

1) First start the Android emulator 2) Copy the APK file that needs to be installed to the Tools folder of the Android SDK (APK and emulator.exe are in the same folder). Here we demonstrate the installation of renren_android_1.5.apk (Renren Client ) file

2024-11-20
Summary of learning about Java reflection mechanism

1. What is the reflection mechanism? Simply put, the reflection mechanism means that the program can obtain its own information when it is running. In Java, as long as the name of the class is given, all information about the class can be obtained through

2024-11-20
How to set java environment variables under windows

Configure JDK environment variables under Windows "Computer" and click "Properties"; 3. Select the "Advanced" tab and click "Environment"

2024-11-20
Comparison between Spring's annotation configuration and XML configuration

Annotation configuration has many advantages over XML configuration: it can make full use of Java's reflection mechanism to obtain class structure information, which can effectively reduce configuration work. For example, when using JPA annotations to

2024-11-20
Detailed explanation of the difference between Logger.getLogger() and LogFactory.getLog()

Logger comes from log4j's own package. If you use Logger.getLogger, you need a log4j jar package. In this way, you can only rely on log4j: LogFactory comes from the common-logging package. If you use LogFactory.getLog, you can

2024-11-20
Java multi-thread synchronization lock mechanism and synchronized in-depth analysis

To use an analogy: an object is like a big house, the door is always open. There are many rooms (aka methods) in a house. These rooms are either locked (synchronized method) or unlocked (normal method). There is a key at the door of the room. This key can

2024-11-20

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