java coding practice

Next: "Architecture design: Inter-system Communication (4)--io communication model and Java Practice Medium", we continue to explain asynchronous IO7. Asynchronous IOIn the previous two articles, we explained the three IO models for blocking synchronous IO, non-blocking synchronous io, multiplexed io, and Java support for these three IO models. The main point is

outstanding open source Concurrency Toolkit, java.util.concurrent, which contains mutex, trust, and performance-performing collection classes such as queues and hash tables, and some work queue implementations under concurrent access. The Pooledexecutor class in this package is an efficient, widely used, and correct implementation of a thread pool based on a work queue. Instead of trying to write the code yourself, it's easy to make mistakes, and you can consider using some of the tools in the

Friday free to do nothing, based on an analysis of the 12306 ticketing algorithm (Java version) theory, the Java coding practice for your readers reference (the following is a brief description of the relevant code) 1. Booking tool category 1.1 The ticket information of the initialization of a train compartment

Http://www.ibm.com/developerworks/cn/java/j-jtp06197.htmlThe Java™ language contains two intrinsic synchronization mechanisms: synchronous blocks (or methods) and volatile variables. Both of these mechanisms are proposed to achieve the security of code threads. Where volatile variables are less synchronous (but sometimes simpler and less expensive), and their use is more error-prone. In this period of

Guidelines for using volatile variablesThe Java™ language contains two intrinsic synchronization mechanisms: synchronous blocks (or methods) and volatile variables. Both of these mechanisms are proposed to achieve the security of code threads. Where volatile variables are less synchronous (but sometimes simpler and less expensive), and their use is more error-prone. In this period of Java theory and

stage. In each iteration, the following five steps can be taken to guarantee and improve the code quality of the entire project: Unified coding specification, code style, static code analysis (statics code review), unit testing, continuous integration, code review and Refactoring (Review Refactor). The following is a detailed description of each step and the tools and methods that it uses. Figure 1. Java

Java Theory and Practice: using Volatile variables correctly Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This ar

on hash The entire allocation process is artificially mastered, and when certain requests must be assigned to the specified server, the modifications are simpler Disadvantages: Large number of coding needs rigorous testing Need to proactively maintain a routing table, storage is an issue to consider When the request volume is large, the routing table capacity will increase, you can consider to deposi

To exercise your Java coding capabilities, plan to do three more complete projects, namely:1.OA System Wisdom Podcast Soup Sunshine Edition;2. The e-shop is also the teacher's name of the Preach Wisdom podcast forgotten;3.BBS Academy Horse Soldiers;This group of essays is to follow up on the progress of these three projects, to document the problems encountered during the

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Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using volatile variables effectively, and highlights several scenarios where volatile variables are not appropriate.Th

[Java concurrent programming practice] -- synchronized, asynchronous ynchronized In our practical application, we may often encounter such a scenario: multiple threads read or write the same data, access the same file, and so on. If we do not control this situation, it is very easy to cause errors. In java, the concept of critical section is introduced to solve t

Java 9 is faster: JShell hands-on practice HowIs it one of the coolest features of Java 9? Last week, I finally took the time to experience a preemptive version of Java 9. The first stop is JShell, which is also called the Kulla project. This is why at first I had the courage to try

Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using volatile variables effectively, and highlights several scenarios where volatile variables are not appropriate. T

two numbers in {8, 9, 10}, respectively 8 and 9, from {PiDelete them and add 17 to the {10, 17} and the cost is 17.4. Find the minimum two numbers in {10, 17}, respectively 10 and 17, from {PiDelete them and add 27 to the {27} at a cost of 27.5. Now, only one number 27 is left in the sequence, and the construction process ends with a total cost of 5+10+17+27=59. Input format the first line of input contains a positive integerN（NNext isNA positive integer that representsP0,P1,...,PN-1, no more t

Volatile variables in the Java language can be thought of as "light", and synchronized synchronized volatile variables require less coding and run-time overhead than blocks, but only part of the functionality that they can implement synchronized . This article describes several patterns for using volatile variables effectively, and highlights several scenarios where volatile variables are not appropriate.Th

design. Back to top of pageConclusionThrough a unified definition equals() and you can promote the usability of a hashCode()， class as a keyword in a hash-based collection. There are two ways to define equality and hash values for an object: based on identity, which is the Object default method provided, and based on state, which requires Override equals() and hashCode() . When the state of an object changes, if the hash value of the object changes, you are sure that you are not allowed to cha

, it is more efficient than the normal array transfer, but because the construction/destruction/maintenance of the shared memory cost is relatively large, so the small data of the array is recommended to use the same method, Direct The buffer mode is more suitable for long-term sharing of large chunks of memory with frequent access. The specific use method is described as follows:First look at the definition of Native.java:and see how native.c is implemented:As can be seen from the above code, i

main code as follows:Code 3public class Executorgroup {Executor[] group = new Executor[NUM];Thread boss = null;MapAtomicinteger cursor = new Atomicinteger ();volatile int cursor = 0;Public Executorgroup (String name) {//init Group for (int i = 0; i Registeredtables.put (Taskkey, Cursor.getandincrement ());Registeredtables.put (Taskkey, cursor++% NUM);}int index = Registeredtables.get (Taskkey);Logger.debug ("execute message {}, register index {}", Taskkey, index);try {Group[index].schedule (mes

Address: http://blog.csdn.net/kongxx/article/details/7319410 One of Java Socket practices: Single-thread Communication Java Socket practice 2 multi-thread Communication Java Socket 3 transmission object Java Socket practice