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Java tutorial
  • Detailed introduction to common configuration instructions of log4j

    Detailed introduction to common configuration instructions of log4j

    Many people think that log4j is difficult to use because it does not output to the IDE console. Haha, in fact, it is all caused by the configuration. Let’s see how I configured it to the console step by step. I believe that log4j’s output level and output
    2024-11-17
  • Analysis of communication protocol between hadoop client and datanode

    Analysis of communication protocol between hadoop client and datanode

    This article mainly analyzes the process of read and write block of hadoop client. As well as the protocol of communication between client and datanode, data flow format, etc. The communication between hadoop client and namenode is through RPC protocol, b
    2024-11-17
  • Tomcat memory overflow analysis and solutions

    Tomcat memory overflow analysis and solutions

    JVM manages two types of memory, heap and non-heap. The heap is for developers to use, as mentioned above, it is created when the JVM starts; the non-heap is reserved for the JVM itself to store class information. It is different from the heap. GC will no
    2024-11-17
  • Detailed explanation of Struts logic tag library

    Detailed explanation of Struts logic tag library

    1.logic:empty The logic:empty tag is used to determine whether it is empty. If empty, the content embedded in the tag body will be processed. This tag is used in the following situations: When the Java object is null When the String object is ""
    2024-11-17
  • Java Code Mystery Operator Chapter

    Java Code Mystery Operator Chapter

    Let's start with the simplest operator, the plus sign (+). The plus sign (+) is a binary operator - that is to say, the plus sign only connects two numbers, never the third or more numbers. Connected. Therefore, "1 plus 2 plus 3" is expresse
    2024-11-17
  • Solution to error reporting when compiling and installing mysql under centos

    Solution to error reporting when compiling and installing mysql under centos

    Today, when compiling and installing mysql from the source code under centos6.2, an egg error was reported when compiling mysql: Copy the code as follows: [root@vps870 mysql-5.5.28]# cmake -DCMAKE_INSTALL_PREFIX=/usr/local /mysql / > -DMYSQL_UNIX_ADDR=
    2024-11-17
  • Detailed introduction to three methods of passing parameters to multiple threads in java

    Detailed introduction to three methods of passing parameters to multiple threads in java

    In the traditional synchronous development model, when we call a function, the data is passed in through the parameters of the function, and the final calculation result is returned through the return value of the function. However, in the multi-threaded
    2024-11-17
  • Introduction to how to exchange the values ​​of these two variables in java

    Introduction to how to exchange the values ​​of these two variables in java

    1. Use the intermediate quantity to exchange int x = 10; int y = 20; int temp = x; Consider x as a cup containing white wine, and y as a cup containing red wine int temp = x; Pour the white wine into the empty cup, at this time temp contains white wine, a
    2024-11-17
  • Comprehensive analysis of String object data type in Java

    Comprehensive analysis of String object data type in Java

    1. First of all, String does not belong to the 8 basic data types. String is an object. Because the default value of an object is null, the default value of String is also null; but it is a special object and has some characteristics that other objects do
    2024-11-17
  • Detailed introduction to enumeration types in java

    Detailed introduction to enumeration types in java

    There is a values ​​method in the enumeration that is used to generate an array in the order defined by the enumeration, which can be used to traverse. Our custom enumeration classes all inherit from java.lang.Enum and have the following functions in the
    2024-11-17
  • Java dynamic proxy implementation method of proxy mode

    Java dynamic proxy implementation method of proxy mode

    By chance today, I suddenly wanted to take a look at the dynamic proxy of JDK, because I knew a little about it before, and I just wanted to test its use. I quickly wrote these interfaces and classes: Interface class: UserService. The java copy code is as
    2024-11-17
  • Some detailed analysis of java string

    Some detailed analysis of java string

    First of all, let me explain that this refers to String in Java. Although I have decided to switch to C/C++, because I encountered a problem today, I still want to take a look. The definition of String is as follows: Copy the code as follows: public final
    2024-11-17
  • In-depth analysis of java automatic boxing and unboxing

    In-depth analysis of java automatic boxing and unboxing

    This is a new content introduced after jdk1.5. As I insist that publishing is the best memory, I decided to replace my memory with a blog: The Java language specification says: In many cases, packaging and unpacking are It is done by the compiler itself (
    2024-11-17
  • Basics of running Solr in Eclipse

    Basics of running Solr in Eclipse

    I am still a newbie in Solr, and writing these articles is just to record my experience in learning Solr in the recent period. What is Solr? When I was learning Solr recently, I kept seeing a sentence that Solr is an out-of-the-box search server based on
    2024-11-17
  • Analysis of the differences between Java's String, StringBuffer, and StringBuilder

    Analysis of the differences between Java's String, StringBuffer, and StringBuilder

    I believe that everyone has a good understanding of the difference between String and StringBuffer, but it is estimated that there are still many comrades who are not clear about the working principles of these two classes. Today I will review this concep
    2024-11-17
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