包含标签：Java 的文章
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java_ generic paradigm
I Use of generic classes 1. Use generics when defining classes 2. be careful: 3. Code example -
Java_ Bubble sorting_ Principle and optimization
Bubble sorting and its optimization I Principle and optimization principle 1. Principle explanation Bubble sorting…… -
struts2_ Is struts 2 thread safe?
Thread safety: multiple threads execute concurrently in a process. During thread execution, the variable values are th…… -
JSTL_ Core tag library
I explain 2： Core tag library The core tag library provides the general functions required for JSP page programming. …… -
struts2_ Struts 2 basic configuration
Basic configuration 1. Create a new web project 2. Import the jar package. Download the jar package required by stru…… -
Java_ Properties
Java_ Properties class Differences between hashtable and HashMap HashMap thread is unsafe, asynchronous and efficient …… -
Solve org hibernate. HibernateException: identifier of an instance of com. ahd. entity. Order was altered from2 to 0
error message Causes: 1. eg. The type of ID in the mapping file is integer, that is, int, while the type o…… -
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Solve the problem of install new software in MyEclipse
Click Help in eclipse to directly find the install new software option to install plug-ins, but help does not have thi…… -
Solve org hibernate. exception. SQLGrammarException:could not insert
Today, I encountered this error when building a project using hibernate. I haven't found the reason for the error for …… -
struts2_ Struts type conversion
I In the servlet, the non string type submitted by the form needs to be converted manually 1. In struts, the commo…… -
Java_ Folder splitting and merging
I Idea: 1. Document cutting: The class RandomAccessFile is used, in which the method seek can customize the readin…… -
Java Web Series: Fundamentals of Java Web projects
1. Java web module structure JSP files are similar to axpx files. Paths and URLs correspond to each other one by one a…… -
Basic use of Java enumeration classes
Enum type is a new feature in Java 5. It is a new type that allows constants to represent specific data fragments, and…… -
Java Web Series: JDBC Foundation
ADO. Net in Java is the enterprise library dataaccessapplicationblock module, the module in Java, and the orm of entit…… -
Java Web Series: JAAS authentication and authorization Foundation
1. Overview of certification and authorization (1) Authentication: authenticates the user's identity. . Net based RBS …… -
Detailed summary of transaction in Java
< H4 id = "1 what is a Java transaction" > < span style = "color: #3366ff;" > 1. What is a Java transactio…… -
JAVA Chinese garbled code
1. In MyEclipse, you can set the file encoding format, but when we use scanner to type, because Windows uses GBK encod…… -
Java’s POI technology to read and import Excel
< div class = "cnblogs_highlighter" > project structure: -
Query on “minimizing repeated calculation of variables in the for loop”
In the following article: Described in '': Operation effect: a. b. c. d. Summary: a lot of data has been tested, indic…… -
Java reflection – dry goods
After reading many articles on java reflection, I summarized what I saw. Help yourself and others more or less. First,…… -
Blog Garden_ Insert code (recommended)_ Button function realization_ Code highlights
Operation effect: : preparation 1. Download SyntaxHighlighter_ 1.5. 1.rar Download address: After decompression, D…… -
Urlrewriter in Java (URL rewriting)_ Source download
Recently, I used URL rewriting in a project. How to enhance the readability of the address in your website and let the…… -
Java POI technology to read Excel data to MySQL
This blog is to introduce the POI technology in Java, read Excel data, and then save it to MySQL data. You can also le…… -
java_ Free blocks (static and non static blocks)
There are two types of free blocks in Java: Static and non static blocks Static block: Non static block: Test Demo: Co…… -
Java Web – Filters
《 Application of Java Web development technology - filter < p class =" best text mb-10 "> a filter is a program…… -
A demo tells you the power of the optimization algorithm
The demo here is an accumulation algorithm, such as 1,2,3,4 n That is: sum = 1 + 2 + 3 + 4+ n; We can do this: Another…… -
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L1 cache in Hibernate
HibernateTest. java code: Operation effect: As we will see, only one select statement is used here. But we read two re…… -
Introduction to algorithm – binary search algorithm
Algorithm premise: The algorithm idea is: 1. Compare the middle value in the array with the searched value each time 2…… -