Java

The purpose of this test is to verify the performance of the current common database connection pool.TestCase Connection conn = dataSource.getConnection(); PreparedStatement stmt = conn.preparedStatement("select 1"); ResultSet rs =

If you find that you have a lot of duplicated code, you might consider using a template method to eliminate error-prone duplicate code. Here's an example: The following two classes complete almost the same functionality: Instantiate and

Java garbage collection mechanismWhen it comes to garbage collection (garbage collection,gc), many people naturally connect it to Java. In Java, programmers don't have to worry about memory dynamic allocations and garbage collection issues, all of

Java Multithreading: How do I create threads?In the previous article, we've covered the origins of processes and threads, and today we'll talk about how to create a thread in Java and have the thread perform a sub-task. Let's start with the

Do you find it difficult to publish Java applications? Fortunately, Java provides a range of packaging and publishing tools that can significantly simplify the publishing processThis article provides several ways to package Java code, and we will

* The basic operation of all encryption techniques is to use the Encrypt () and decrypt () methods for message* Decomposition and composition, where the message is a space-delimited string, except encrypt () and decrypt ()* Outside each encryption

SummaryTo learn Java, you have to understand the constructor. Because constructors can provide many special methods, this is often confusing for beginners. However, there are many important differences between constructors and methods.Original

DescriptionIn Java, the communication between threads is mainly done by the 3 methods of wait,notify , and Notifyall provided by the Java.lang.Object class:After the wait method of the ① object is called, the thread enters the object's wait queue,

Divide-and-conquer algorithm, there are many typical problems, such as recent point problem, linear selection problem, Integer division problem, large integer score problem, board coverage problem, round robin schedule, binary search, Strassen

Reconstruction path Combined Query-passing parameters + Stored Procedure In the previous article, we discussed a method for implementing composite queries. That is, at the U layer, we assembled the where clause of the select statement and assigned

Batch File tool (java + shell command implementation)Batch File tool (java + shell command implementation)A bunch of corpus needs to be processed before it can be used. It should have been directly processed using shell scripts. But not familiar

Design Mode-Adapter Mode)Basic Concepts   The adapter mode converts an interface of a class into another interface that the client expects, so that the two classes that cannot work together due to interface mismatch can work together.   In the GoF

Package and use the JAR library in JAR I wonder if you have such a requirement when writing a Java program: Package the project that references other third-party JAR libraries into a JAR file for running. that is to say, the packaged JAR file

Design Pattern (8)-iterator pattern (iterator) I started to write this blog last Saturday, and it was delayed. I started writing this blog only a few days ago. I woke up early today and sorted this part out. This article describes how to learn the

Java matches Regular Expressions in Chinese and java matches regular expressions.   [\u4E00-\u9FA5]*   Public static void regxChinese () {// String source = " "; // convert the string to be matched to lower case // source = source. toLowerCase (); //

Research on java code initialization processI just saw an article on java code Initialization on ITeye. I tried to reason the result when I saw the code. Although it was a university knowledge, I did not expect to be able to do it right. (It seems

Introduction to common Activiti classes, activiti Why workflow? Disadvantages of traditional design when the process changes:1. process-related attributes and Business Object Attributes are stored in business objects.2. process-related logic and

Determine whether a single link is cyclic and find the first cyclic Node Introduction Determine whether a single link is cyclic and find the first cyclic node. Ideas [Determine whether a single link is cyclic]: If a single link is cyclic, the cyclic

Algorithm Summary-Euclidean AlgorithmEuclidean algorithms 1. Euclidean algorithms the Euclidean algorithm is also known as the moving phase division. It is used to calculate the maximum approximate numbers of two positive integers a and B. The

Pr & #252; fer encoding and Cayley FormulaThe number of trees whose vertices pass through the formula of Pr ü fer encoding and the formula of Cayley is equal to n ^ (n-2) Today, I encountered a problem: in a n-level full graph, the number of all the