Java Multithreading: Thread Synchronization--experimental 5__java

Original address: http://blog.csdn.net/huang_xw/article/details/7318554

/** * @Description: Thread 1 Accesses an instance of the thread-safe object StringBuffer, which is blocked when thread 2 is to be accessed.

* @author Snoopy * @blog HTTP://BLOG.CSDN.NET/HUANG_XW/package Basic.b_syn;

Import Org.apache.log4j.Logger;
	public class Testsyne {private static Logger Logger = Logger.getlogger (Testsyne.class);

	StringBuffer sb = new StringBuffer ("initial string +");

		Thread 1 Static class T1 implements Runnable {Testsyne s;
		Public T1 (Testsyne sameobj) {this.s = Sameobj;
			//Thread 1 access Method syn1 () public void Run () {logger.debug ("Start thread 1 ...");
			S.syn1 ();
		Logger.debug ("Exit thread 1 ....");

		}//thread 2 static class T2 implements Runnable {Testsyne s;
		Public T2 (Testsyne sameobj) {this.s = Sameobj;
			//Thread 2 access Method syn2 () public void Run () {logger.debug ("Start thread 2 ...");
			S.SYN2 ();
		Logger.debug ("Exit thread 2 ....");
		} public void Syn1 () {String threadstr = Thread.CurrentThread (). GetName ();
		Logger.debug ("▲▲▲▲▲▲" + threadstr + "Start Access Method Syn1 ()");
		try {synchronized (SB) {		Logger.debug (Threadstr + "being visited object SB");
				Sb.append ("Thread 1 added string +");
				Using hibernation to simulate a time-consuming process thread.sleep (5000);
				Logger.debug (Threadstr + "dormant End");
			Logger.debug ("At this time the string is:" + sb.tostring ());
		} catch (Interruptedexception e) {e.printstacktrace ();
	} logger.debug ("▲▲▲▲▲▲" + Threadstr + "Exit Method Syn1 ()");
		public void Syn2 () {String threadstr = Thread.CurrentThread (). GetName ();
		Logger.debug ("" + Threadstr + "Start Access Method Syn2 ()");
		Sb.append ("Thread 2 added string +");
		Logger.debug ("At this time the string is:" + sb.tostring ());
	Logger.debug ("" + Threadstr + "Exit Method Syn2 ()");

		public static void Main (string[] args) {//This is the same object that multithreading will access Testsyne sameobj = new Testsyne ();
		Thread 1 accesses the synchronization method Syn1 () and thread 2 also accesses the synchronization method Syn2 ().
		thread T1 = new Thread (new T1 (sameobj), "Thread 1");

		Thread t2 = new Thread (new T2 (sameobj), "Thread 2");
		T1.start ();
		Sleep is to ensure that thread 1 starts running first, and first accesses the StringBuffer instance.
		try {thread.sleep (50);
		catch (Interruptedexception e) {e.printstacktrace ();
	} t2.start (); }
}

Execution results:

0    [Thread 1] DEBUG Basic.b_syn. Testsyne-Start thread 1
..... 0    [Thread 1] DEBUG Basic.b_syn. Testsyne-▲▲▲▲▲▲ Thread 1 Start Access Method syn1 ()
0    [Thread 1] DEBUG Basic.b_syn. Testsyne-Thread 1 is accessing the object
SB   . [Thread 2] DEBUG Basic.b_syn. Testsyne-Start thread 2
.....   [Thread 2] DEBUG Basic.b_syn. Testsyne-Thread 2 Start Access Method Syn2 ()
5000 [Thread 1] DEBUG Basic.b_syn. Testsyne-Thread 1 hibernate end
5001 [Thread 1] DEBUG Basic.b_syn. Testsyne-At this point the string is: initial string + thread 1 joined the string +
5001 [thread 1] DEBUG Basic.b_syn. Testsyne-▲▲▲▲▲▲ Thread 1 Exit Method Syn1 ()
5001 [Thread 2] DEBUG Basic.b_syn. Testsyne-At this point the string is: the initial string + thread 1 joins the string + thread 2 joins the string +
5001 [thread 1] DEBUG Basic.b_syn. Testsyne-Exit Thread 1
..... 5001 [Thread 2] DEBUG Basic.b_syn. Testsyne-Thread 2 Exit Method Syn2 ()
5001 [Thread 2] DEBUG Basic.b_syn. Testsyne-Exit Thread 2 .....