java synchronized method

In the project development, may encounter Java multithreading, in order to ensure the normal business data, must be coupled with the lock mechanism, commonly used to deal with synchronized keyword, the current JDK version of synchronized has done a very good optimization, we do not have to consider its performance , but in the actual use, often due to improper ha

In Java, the synchronized keyword is used in conjunction with an object's built-in lock to protect the code block from thread safety in a concurrent environment, allowing the protected code block to operate atomically. The synchronized keyword can be used to decorate a method to protect all blocks of code within a

forgetsynchronizedAnd no longer regard it as a good idea that has been optimized? Or even useReentrantLockRewrite our existingsynchronizedCode? In fact, several introductory Java programming books use this method in their multi-threaded chapter, fully usedLockFor example, we only use synchronized as the history. But I think this is too good. Do not discard

Java thread security: the usage of the synchronized keyword is unknown today. The synchronized keyword is used.CodeThread Synchronization is safe. Tested. It is totally wrong. Synchronized must be correctly used to ensure real thread security... Although I knew this method

thread 1, thread 2 in the read,load operation, found that the value of count in main memory is 5, then the latest value will be loadedAfter the thread 1 heap count is modified, it is write to main memory, and the count variable in main memory becomes 6Thread 2 because the read,load operation has been performed, after the operation, the main memory will also be updated count of the variable value of 6When two threads are modified with the volatile keyword in a timely manner, there is still a con

Java concurrent programming instance (synchronized) and java concurrent programming instance Here, we use a small program to illustrate that the logic is a counter (int I). The main logic function is that if resource I is monitored synchronously, no I value is output, however, if the keyword synchronized is not added,

In Java, the Synchronized keyword is used to control thread synchronization, that is, in a multithreaded environment, control synchronized code snippets are not executed concurrently by multiple threads. Synchronized can either be added to a piece of code or added to a method.The point is, don't think it's all right to

, and the data flushed to the main memory , the final main memory data 100+10=110, obviously this is a serious problem, we want to ensure that a thread and B thread in order to execute, the first withdrawal after the remittance or the first remittance after the withdrawal, this is ordered . This article describes how traditional threads are synchronized prior to JDK5.0, and more advanced synchronization methods are available in

First, the basic use of synchronized Synchronized is one of the most common methods for solving concurrency problems in Java, and the simplest one. The main functions of the synchronized are three: (1) To ensure that the Access synchronization code (2) is mutually exclusive, so that the modification of the shared vari