java synchronized method

current object; 3. the synchronized keyword cannot be inherited. That is to say, the method of the base class synchronized F () {} is not automatically synchronized F () {} in the inheritance class (){}, instead, it becomes F (){}. You need to explicitly specify a method of

Multi-threaded synchronization mechanism to lock the resources, so that at the same time, only one thread can operate, synchronous to solve the problem that can occur when multiple threads concurrently access.The synchronization mechanism can be implemented using the SYNCHRONIZED keyword.When the Synchronized keyword modifies a method, the

Original link:Http://www.cnblogs.com/dolphin0520/p/3923737.htmlAlthough multi-threading programming greatly improves efficiency, it also poses some pitfalls. For example, two threads that insert non-duplicated data into a database table can cause the same data to be inserted in the database. Today we come together to discuss thread safety issues and what mechanisms are available in Java to address threading security issues.The following is the directo

Java Multithreading (vi) Synchronized keywordsMulti-threaded synchronization mechanism to lock the resources, so that at the same time, only one thread can operate, synchronous to solve the problem that can occur when multiple threads concurrently access.The synchronization mechanism can be implemented using the synchronized keyword .　　When the

the compiled bytecode: only three operation codes are required for generating a zero-Length byte [] object, object lock = new object () requires 7 lines of operation code. 3. apply synchronized to the static function. The sample code is as follows: Class foo { Public synchronized static void methodaaa () // synchronized static function { //.... } Public void met

Java Concurrency Programming: synchronizedAlthough multi-threading programming greatly improves efficiency, it also poses some pitfalls. For example, two threads that insert non-duplicated data into a database table can cause the same data to be inserted in the database. Today we come together to discuss thread safety issues and what mechanisms are available in Java to address threading security issues.The

Java Concurrency Programming: synchronizedAlthough multi-threading programming greatly improves efficiency, it also poses some pitfalls. For example, two threads that insert non-duplicated data into a database table can cause the same data to be inserted in the database. Today we come together to discuss thread safety issues and what mechanisms are available in Java to address threading security issues.The

that the object that is currently calling the method belongs to (class, Instead of being a specific object generated by this class.Remember in the book "Effective Java" that the Foo.class and P1.getclass () used as a synchronous lock is not the same, can not use P1.getclass () to achieve the purpose of locking this class. P1 refers to objects that are generated by the Foo class.It can be inferred that if a

main (string[] args) {Example Example = new Example (); Thread T1 = new Thread1 (example); Thread t2 = new Thread2 (example); T1.start (); T2.start (); Class Example {public synchronized void execute () {A for (int i = 0; i If the synchronized keyword is removed, two methods are executed concurrently without affecting each other. But as the example program says, even two methods:

area before the lock is released) obtains data from main memory and brushes the master after releasing the lock.order (Mutex):Guarantees that the critical area code threads are mutually exclusive. synchronized the basics of implementing synchronization: synchronized implements the lock mechanism through object Header (Markwork). Each object in Java can be used a

: Class foo { Public synchronized static void methodaaa () // synchronized static function { //.... } Public void methodbbb () { Synchronized (FOO. Class) // class literal (Class Name literal constant) } } The methodbbb () method in the Code uses class literal as the lock. It produces the same effect as the

Three test classes are used to illustrate different scenarios of synchronized applications. The first is the use of the most basic Synchronized Method. Package COM. jadyer. thread. sync; /*** Synchronized Method Test * @ see ============================== =================

First look at a synchronized of the detailed:Synchronized is a keyword in the Java language that, when used to modify a method or a block of code, ensures that at most one thread at a time executes that segment of code. First, when two concurrent threads access the synchronized (this)

For example, an object is like a big house, and the door is always open. There are many rooms in the house (that is, the method ). These rooms are locked (Synchronized Method) and cannot matchLocks (common method ). There is a key at the door of the room, which can open all the locked rooms. In addition, I compared all

The author of this article is unknown from the Internet, because posts are everywhere. After reading it, I have solved some of my questions about synchronized and confirmed that my previous understanding is correct. Synchronized in java programming: 1. the synchronized keyword has two scopes:1) In an object in

To solve the "dirty data" problem, the simplest method is to use the synchronized keyword to synchronize the run method. The Code is as follows: Public synchronized void run (){} From the code above, we can see that as long as the synchronized keyword is added between void a

(); Thread T1 = new Thread1 (example); Thread t2 = new Thread2 (example); T1.start (); T2.start (); }}class example{public synchronized Void execute () {for (int i = 0; i If you remove the Synchronized keyword, the two methods are executed concurrently and do not affect each other.　　However, even two methods are written in the example program:　　The execution result is al

thread synchronization: Because multiple threads of the same process share the same piece of storage space, it also poses a serious problem with access violations when it comes to convenience. The Java language provides a specialized mechanism to resolve this conflict, effectively avoiding the same data object being accessed by multiple threads concurrently.a few questions need to be clarified:1)The synchronized