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Java tutorial

Detailed analysis of the use of log4j

1 Log4j configuration instructions 1.1 Configuration file Log4j can be dynamically set through the java program. The obvious disadvantage of this method is: if you need to modify the log output level and other information, you must modify the java file an

2024-11-21
A simple example of calling a specified method of an unknown class in java

Copy the code as follows:/*** Get the value of returnMapObject in any object. And form a list* @param<T> * @param list* @param fields* @return* @throws Exception*/@

2024-11-21
2024-11-21
Detailed explanation of the assert keyword in Java traps

1. Overview In both C and C++ languages, there is the assert key, which represents assertion. In Java, there is also the assert keyword, which means assertion. The usage and meaning are similar. 2. Syntax In Java, the assert keyword was introduced from JA

2024-11-21
A brief analysis of the differences between final, finally, and finalize

1.final final modifies the class, indicating that this class cannot be inherited and is a top-level class. final modifies a variable to indicate that the variable is a constant. The final modified method means that this method cannot be overridden, but it

2024-11-21
Java implementation method of obtaining project file path

this.getClass().getResource("/").getPath().substring(1) The path obtained is E:/myeclipse/test/WebRoot/WEB-INF/classes/, which is the home directory. this.getCla

2024-11-21
Detailed analysis of java dynamic proxy (jdk and cglib)

JAVA's Dynamic Agent Agent pattern The agent pattern is a commonly used Java design pattern. Its characteristic is that the agent class and the delegate class have the same interface. The agent class is mainly responsible for preprocessing messages fo

2024-11-21
Comprehensive analysis of GC and ghost references in Java

There are a total of 4 types of references in Java: StrongReference, SoftReference, WeakReference and PhantomReference (the legendary ghost reference haha). These 4 types of references are closely related to GC.

2024-11-21
Explore how to filter version control files .svn in Eclipse

When we use version management tools, such as CVS, SVN or harvest, we will find many redundant folders and files outside of the code in the local source code that is checked out. These folders and files are very important for version management tools. , c

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

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