java synchronized method

In the case of multithreading, multiple threads of the same process share the same storage space, which brings convenience while also causing access conflicts. Java provides a dedicated mechanism to resolve such conflicts,This effectively prevents the same data object from being simultaneously accessed by multiple threads. Because we can use private keywords to ensure that data objects can only be accessed by methods, we only need to propose a mechani

1. Synchronized principle In Java, each object has and has only one synchronization lock. This also means that the synchronization lock is dependent on the object and exists. When we call the Synchronized method of an object, we get a synchronized lock on the object. For e

called on one lock object; otherwise, the following exception occurs:Java. lang. IllegalMonitorStateException: current thread not ownerThe following code is valid: the first example calls this. policyall (); this is the lock object.[Java]Public synchronized void sendNotification () throws Exception {Policyall ();}Synchronized (policywaittest. lock ){Try {Policyw

The concept of lock is familiar to everyone, when a thread A has already held a lock when thread B tries to enter a code segment protected by this lock. It will be blocked. The operation granularity of the lock is "thread", not the call. Each Java object can be used as a mutex (synchronized) that implements synchronization, which is called a built-in lock. When a thread enters a synchronous code block or

The synchronized keyword can be used in two ways. The first is the definition of the method that is directly used in the article "Synchronize class methods with synchronized keywords. The other is the synchronized block. We can not only use the synchronized block to synchron

Concurrent Series Reference article http://www.cnblogs.com/skywang12345/p/3323085.html#3907193Synchronized principleIn Java, each object has and has only one synchronization lock. This also means that the synchronization lock is dependent on the object and exists.When we call the synchronized method of an object, we get the synchronization lock for that object. F

moderation, and only the lock can access the(4) Declare the static member function of the class as synchronized. This lock works on all object instances of the class. Similar to 3.Other:(1) Synchronized keyword is not inherited, that is, the method of the base class synchronized F () {} is not automatically

Thread {private MyService service;public Threada (MyService service) {super (); this.service = Service;} @Overridepublic void Run () {super.run ();Service.servicemethoda ();}}public Static ClassthreadbExtends Thread {private MyService service;public threadb (MyService service) {super (); this.service = Service;} @Overridepublic void Run () {super.run ();Service.servicemethodb ();}}}class MyService {public voidServicemethoda (){synchronized (this){try

the synchronization is implemented by the lock, then in the example above, what object is locked, or what class is locked? There are two variables, one is I, one is Threadnum;i is the method internal, Threadnum is private. to learn more about synchronized's operating mechanism: in Java programs, when using synchronized blocks or

Good memory is better than bad writing ~ ~并发编程中synchronized关键字的地位很重要，很多人都称它为重量级锁。利用synchronized实现同步的基础：Java中每一个对象都可以作为锁。具体表现为以下三种形式。(1) for the normal synchronization method, the lock is the current instance object.(2) for the static synchronization method, the lock is the c

threads then It ' s ideal to use Concurrent Hashmap. Best example is Producer Consumer which handles concurrent read/write.So what does the Thread-safe Map means? If multiple threads access a hash map concurrently, and at least one of the threads modifies the map structurally, it to must be synchronized externally avoid a n Inconsistent view of the contents.How?There is ways we could synchronized HashMap

) {synchronized(token)//Any object can be used as a parameter, but the object is the same for two threads.{intLen = Name.length (); for(inti =0; i ""); } } Public Static synchronized void OUTPUT3(String name) {intLen = Name.length (); for(inti =0; i ""); } }}Then one thread in the init () method calls the output1() m