Java thread Synchronization

Transferred from: http://blog.csdn.net/soartju/article/details/2840491

A little explanation of synchronized in the Java programming idea:

1, the scope of the SYNCHRONIZED keyword has two kinds: 1) is within an object instance, synchronized Amethod () {} can prevent multiple threads from accessing the object's synchronized method at the same time (if an object has multiple synchronized methods, As long as a thread accesses one of the synchronized methods, the other thread cannot access any of the synchronized methods in the object at the same time. At this point, the synchronized method of the different object instances is not interfering. In other words, other threads can access the Synchronized method in another object instance of the same class at the same time; 2) is the scope of a class, synchronized static astaticmethod{} prevents multiple threads from accessing the synchronized static method in this class at the same time. It can work on all object instances of the class. 2, in addition to the method before using the Synchronized keyword, the synchronized keyword can also be used in a block in the method, indicating that only the resources of this block to implement mutually exclusive access. The usage is: synchronized (this) {/* block */}, which is scoped to the current object; 3, synchronized keyword is not inherited, that is, the method of the base class synchronized F () {} is not automatically synchronized F () {} in the inheriting class, but instead becomes F () {}. Inheriting a class requires that you explicitly specify one of its methods as the Synchronized method;

Java thread Synchronization