java programming problems and solutions

We often encounter three problems in concurrent programming: atomicity, Visibility, and order, and here are a few three questions to analyze. If there are any mistakes, please criticize and correct them. first, the atomic nature Atomic lines: One or more operations as a whole, either all executed or not executed, and the operation is not interrupted by the thread scheduling mechanism during execution, and o

Programming | experience | Chinese 　　Experience of Java programming and configuration in Chinese Java has a long history of Chinese problems, continuous, has not been completely resolved, but there are policies under the policy, we always have the means to deal with it.

One, two main problems in network programming One is how to accurately locate the network on one or more hosts, and the other is to find the host after the reliable and efficient data transmission.In the TCP/IP protocol, the IP layer is mainly responsible for the location of the network host, the routing of Data transmission, the IP address can uniquely determine a host on the Internet.The TCP layer provide

implementation is very powerful, it should be the depth of the usual kung fu. In order to make my pig teammate understand, every piece of code has a detailed comment. Of course, nobody is perfect. Teammates still have some drawbacks: each class variable does not describe encapsulation and does not like writing constructors. Cooperation Evaluation:I still have some problems with my teammates, and of course the responsibility is

Java I/O programming (I)-evolution of Java I/O Reprinted please indicate the source: http://www.cnblogs.com/Joanna-Yan/p/7419117.html In earlier versions of JDK, Java does not fully support I/O, and developers are faced with great challenges and difficulties when developing high-performance I/O programs, the main

The previous section briefly reviewed some basic Java programming knowledge. This section will continue to review and explore this knowledge based on the book Java core technology.1. String The Java string is actuallyUnicode Character Sequence. For example, the string "Java

Multi-threaded Multi-core Java multi-threaded programming technology analysis-general Linux technology-Linux programming and kernel information, the following is a detailed description. I. multithreading technology in the Java environment Building a threaded application often has an important performance impact on the

Java concurrent programming and java concurrency This article records the immutability of the policy to ensure concurrency security. (Note: It is Immutable, not Invariant !) Organizes a series of actions into an atomic operation to ensure immutability conditions, or uses a synchronization mechanism to ensure visibility, to prevent reading of invalid data or chan

1 OutputStreamWriter out =...2 java. SQL. Connection conn =...3 try {// retry4 Statement stat = conn. createStatement ();5 ResultSet rs = stat.exe cuteQuery (6 "select uid, name from user ");7 while (rs. next ())8 {9 out. println ("ID:" + rs. getString ("uid") // response10 ", name:" + rs. getString ("name "));11}12 conn. close (); // (3)13 out. close ();14}15 catch (Exception ex) // (2)16 {17 ex. printStackTrace (); // (1), (4)18}As a

threadb resources, threadb waiting for Threada resources (here because of the synchronization method used, So the resource exactly refers to the object-level lock of the D1 and D2, which causes the deadlock. While there is no good way to avoid deadlocks in Java, it is useful to follow some rules in programming to minimize the occurrence of deadlocks: minimizing the scope of the lock, such as using a synchr

Deep Java concurrency Lock http://blog.csdn.net/zhaozhenzuo/article/details/37109015 Java Concurrent Programming: Lock Http://www.importnew.com/18320.html How to understand condition http://ifeve.com/understand-condition/ http://blog.csdn.net/johnny901114/article/details/8695708 SOURCE Analysis of Concurrenthashmap http://www.iteye.com/topic

Copyright NOTICE: This article is the original article of the blogger, without the permission of the blogger may not be reproduced. Reprint please indicate the source: http://blog.csdn.net/ns_code/article/details/17526127 In order to facilitate the users to learn and to facilitate their own review, the Java TCP/IP socket programming series content in accordance with the learning order of the simple and eas

ObjectiveOpening Ming Yi: Java is OOP programming and there is no concept of global variables.Why use global variablesYou want to be able to refer to a member variable that is not defined in this class in another class, there are two methods, one is parameter passing (this is most consistent with OOP programming idea, but this will increase the number of paramete

Reprint Please specify source: http://www.cnblogs.com/Joanna-Yan/p/7723174.htmlPrevious: Java IO programming Full Solution (ii)--traditional bio programmingIn order to solve the problem that the synchronous blocking I/O faces a link that requires a threading process, someone later optimizes its threading model, and the backend uses a thread pool to handle requests from multiple clients, forming the number o

In the recent development of JavaFX, because there is no control that can only enter a number, each time the user input string is converted, but Java in the use of the Double.parsedouble () method when the conversion fails to throw an exception, every time try, Catch is tedious, and I learned swift in my spare time to find that Swift's optional and as can be extremely elegant solutions to this problem, the

Programming, Chinese Characters | solving | Problems in the Java language programming, we often encounter the Chinese character processing and display problems. A large pile of garbled reading is certainly not what we would like to see the display effect, how can we make tho

Java concurrent programming and java concurrency The reason why Latch and Barrier are put together is that they give people a similar feeling.They all block some behaviors until an event occurs, but Latch is waiting for an event, while Barrier is waiting for the thread. First, compare the descriptions of the two in JCIP:Latch-A latch is a synchronizer that can de

A lot of Android developers like me, with the IDE may be from Google's Android Web download ADT bundle Eclipse Bar, it is really convenient, the decompression is directly available. But some time ago encountered a problem, was intended to use a butterknife this injection framework, but not just throw the jar bag into the Project Libs folder is finished, but also required in the project right key preference find Java Compiler, After expansion, configur

= managers; The process of assigning the value of employees must be the manager type, from the above example can be seen, run time will do such checks, but compile time will not be checked so deep, Only check the declaration type of the variable, it seems the Java compiler is not smart enough AH:)3. In the actual programming process, the use of the object variable polymorphism must be noted (especially whe

perform another task in the work queue. The advantages are as follows: The number of creation and destruction times is reduced, and each worker thread can be reused and able to perform multiple tasks. According to the system's carrying capacity, it is convenient to adjust the number of threads in the thread pool to prevent the system from crashing because of excessive system resource consumption. 2. Simple implementation of thread poolHere is a simple thread pool of your own w