java code snippets for practice

, and it relies on hardware directives to ensure that this is a CAS operation (Compare and Swap). After JDK1.5, the Java program can use CAS operations only. We can further study the source code of Reentrantlock, will find that one of the more important way to get the lock is compareandsetstate, here is actually called the CPU to provide special instructions. Modern CPUs provide instructions to automaticall

English Original: LinkedIn feed:faster with less JVM garbageWhen I recently brushed the technical blogs of major companies, I found a very good blog post on LinkedIn's technology blog. This blog post describes the LinkedIn information middle tier feed Mixer, which provides support for multiple distribution channels such as LinkedIn's web home page, University homepage, company homepage, and client (as shown).A library called SPR ("Super") is used in the feed mixer. The blog is about optimizing t

files or cut log files) Support for gb18030, UTF-8, UTF-16LE, UTF-16BE and other common log file types cut (not cut off half a character) Highly configurable (program execution cycle, log file expiration time to be deleted, log file threshold to be cut, and retained size) Http://ldcsaa.googlecode.com/files/LogCutter.zip Resources 3. Design and Implementation of General Java file upload and download Components Abstract:File

one Hashtable instance is used. The other one is ignored because it is not referenced. The memory is wasted. The new operation also affects the code execution speed.Application phase: This object must have at least one reference during maintenance.Invisible stage: beyond the scope of the variable. Here is a good practice, because the JVM does not recycle the object immediately during GC, but judges whether

Learn the basics of building a Java environment today.First download the JDK from the official website, and then follow the process of the video to the environment variable configuration, so that it can be more convenient application of Java development tools, in short, can be directly input javac each time the compiler file, do not enter a large string of content.Next Open the

Description: This article is mainly referenced from the "Distributed Java Application: Foundation and Practice"1. Java Code Execution process First step: *.java-->*.class ( compilation period ) Step two: Load the content from the *.class file into memory (class

How to write a piece of code in Java to cause memory leakage Q:I attended the interview just now. The interviewer asked me how to write the Java code with Memory leakage. I have no idea at all about this problem. A1:The following steps make it easy to cause memory leakage. program

Java implementation of the two-dimensional code generation of several methods, specific as follows: 1: Using Swetakeqrcode to generate a two-dimensional code in a Java project http://swetake.com/qr/Download Address or Http://sourceforge.jp/projects/qrcode/downloads/28391/qrcode.zip. This is written by the Japanese

Many WEB developers often complain that java™ee is too complex to build new WEB components, that customizing existing components is not as simple as expected, and that even small changes require a restart of the application. This series provides solutions to these problems, using code generators, conventions, scripting languages, and Advanced JavaServer pages™ (JSP) features. In this article, you'll learn h

This article comes from a hot discussion on the StackOverflow question and answer website: How to write a piece of code in Java that will cause a memory leak.Q: I was in the interview just now, and the interviewer asked me how to write out the Java code that would be leaking memory. I have no idea of this problem, it's

Label:When building a Java Web project using Jenkins, there is a static code check that uses the built-in FindBugs plug-in to check the program source code to analyze the program's behavior, apply it to program correctness checks, Security flaw detection, program optimization, etc., is characterized by non-execution procedures. It helps to find the following issu

1: Using Swetakeqrcode to generate two-dimensional code in a Java projecthttp://swetake.com/qr/or Http://sourceforge.jp/projects/qrcode/downloads/28391/qrcode.zip.This was written by the Japanese and generated by our common square QR code.Can be in Chinesesuch as: 5677777GHJJJJJ2: Use barcode4j to generate barcodes and QR codesBARCODE4J Website: http://sourceforge.net/projects/barcode4j/BARCODE4J is a two-d

Predi Cate bipredicate SUPPLIERL T T>-Producer: no input, output T consumer biconsumer unaryoperator binaryoperator In addition, more specific functions are added to the basic type of processing, including: Booleansupplier, Doublebinaryoperator, Doubleconsumer, Doublefunction To create a functional interface Sometimes we need to implement a functional interface, the practice is very simple, first of all you have t

three variables, and then define a method int volume () to calculate the volume of the box. Finally, a box class object B is created in main class Ky3_2 's main () method, first by invoking the Setbox () method of object B to set the length, width and height of the box, and then by invoking the volume () method of object B to calculate the volume of the box of the given size and output the result.Requirements: The source code of the program, the resu

In the first two articles of this series, we showed you how to implement a simple blockchain with refined Java code. including building blocks, validating block data, broadcast communications, and so on, this article focuses on how to implement the POW algorithm. Everyone exclaimed about the continuing frenzy of Bitcoin, Ethereum, and other cryptocurrency, especially for newcomers to the field, who are

Reference fromHttp://www.cnblogs.com/tianzhijiexian/p/3906774.htmlHttps://github.com/tianzhijiexian/HttpAnnotation/blob/master/lib/src/main/java/kale/net/http/util/HttpReqAdapter.javaOriginal webpage address: http://www.codeceo.com/article/java-reflector.html ...Summary: The simplest and most elegant use of reflection.Examples of this article can be seen in the sample c