Synchronize method : Lock Synchronize « Threads « Java






Synchronize method

Synchronize method
     
public class OnlyOneInMethod extends Object {
  private String objID;

  public OnlyOneInMethod(String objID) {
    this.objID = objID;
  }

  public synchronized void doStuff(int val) {
    print("entering doStuff()");
    int num = val * 2 + objID.length();
    print("local variable num=" + num);

    try {
      Thread.sleep(2000);
    } catch (InterruptedException x) {
    }

    print("leaving doStuff()");
  }

  public void print(String msg) {
    threadPrint("objID=" + objID + " - " + msg);
  }

  public static void threadPrint(String msg) {
    String threadName = Thread.currentThread().getName();
    System.out.println(threadName + ": " + msg);
  }

  public static void main(String[] args) {
    final OnlyOneInMethod ooim = new OnlyOneInMethod("obj1");

    Runnable runA = new Runnable() {
      public void run() {
        ooim.doStuff(3);
      }
    };

    Thread threadA = new Thread(runA, "threadA");
    threadA.start();

    try {
      Thread.sleep(200);
    } catch (InterruptedException x) {
    }

    Runnable runB = new Runnable() {
      public void run() {
        ooim.doStuff(7);
      }
    };

    Thread threadB = new Thread(runB, "threadB");
    threadB.start();
  }
}

           
         
    
    
    
    
  








Related examples in the same category

1.Thread: Dining Philosophers
2.Synchronizing on another objectSynchronizing on another object
3.Operations that may seem safe are not, when threads are presentOperations that may seem safe are not, when threads are present
4.Synchronizing blocks instead of entire methodsSynchronizing blocks instead of entire methods
5.Boolean lockBoolean lock
6.Static synchronized blockStatic synchronized block
7.Thread notifyThread notify
8.Thread deadlockThread deadlock
9.Threads joinThreads join
10.Static synchronizeStatic synchronize
11.No synchronizeNo synchronize
12.Thread synchronizationThread synchronization
13.Synchronized Block demoSynchronized Block demo
14.Interruptible Synchronized Block Interruptible Synchronized Block
15.SignalingSignaling
16.Simple Object FIFOSimple Object FIFO
17.Object FIFOObject FIFO
18.Byte FIFOByte FIFO
19.Daemon Lock
20.Determining If the Current Thread Is Holding a Synchronized Lock
21.Handle concurrent read/write: use synchronized to lock the data
22.Lock for read and write
23.Read Write Lock
24.Coordinates threads for multi-threaded operations
25.A reader-writer lock from "Java Threads" by Scott Oak and Henry Wong.
26.Invoke a series of runnables as closely to synchronously as possible
27.This program shows how multiple threads can safely access a data structure, using synchronized methods
28.This program shows data corruption when multiple threads access a data structure.
29.Stores a single object for the producer/consumer pattern and takes care of thread synchronization.
30.The BooleanLock class provides a useful encapsulation of a boolean variable that is easily and safely accessed from multiple theads.