Java multi-thread----thread synchronization

Java multi-thread thread synchronization

Thread synchronization

definition: synchronization means that only one thread can run within the same time period.

Category: synchronization Methods , synchronization blocks.

role: Security to resolve sharing issues.

Sync Block:
Grammar:

synchronized (synchronizing objects) {
Code that needs to be synchronized;
}

Example:

public class Threaddemo implements runnable{private int ticket = 5;public void Run () {for (int i=1;i<=5;i++) {Synchronize D (This) {if (ticket>0) {  thread.sleep (+);  SYSTEM.OUT.PRINTLN ("Sell ticket: ticket=" +ticket--);}}}             

Synchronization method:

Grammar:

Synchronized method return value method name (parameter list) {
}

Example:

public class Threaddemo implements runnable{private int ticket = 5;public void Run () {for (int i=1;i<=5;i++) {This.saleti Cket ();}} Public synchronized void Saleticket () {if (ticket>0) {thread.sleep (1000); SYSTEM.OUT.PRINTLN ("Sell ticket: ticket=" +ticket--);}

A complete example of a synchronization method:

public class Timer {       private static int num = 0;       Public synchronized  void Add (String name) {//During the execution of this method, the current object is           locked num + +;           try {               thread.sleep (1);           } catch (Interruptedexception e) {               //TODO auto-generated catch block               E.printstacktrace ();           }           SYSTEM.OUT.PRINTLN (name + "You are the first" +num + "thread using the Timer");       }   }     public class Testsync implements runnable{       Timer timer = new timer ();       public static void Main (string[] args) {           Testsync testsync = new Testsync ();                      thread T1 = new Thread (testsync);           Thread t2 = new Thread (testsync);           T1.setname ("T1");           T2.setname ("T2");           T1.start ();           T2.start ();       }       public void Run () {           timer.add (Thread.CurrentThread (). GetName ());                  }   }

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Java multi-thread----thread synchronization