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
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
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"/>
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
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:
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
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
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
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
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
To proxy a class with jdk dynamic proxy, the proxied class must implement at least one interface, and only methods in the interface can be proxied. The implementation of dynamic proxy in jdk is generally divided into three steps: 1. Write interface and im
