testunsynchronized.java

java2 primer plus一书源程序

/*
 * TestUnsynchronized.java
 *
 * Created on September 26, 2002, 11:11 AM
 */

package ch18;

/**
 *
 * @author  Stephen Potts
 */
public class TestUnsynchronized 
{
   int taskID;
    
    /** Creates a new instance of TestUnsynchronized */
    public TestUnsynchronized()
    {
    }
    
    public void performATask(int val)
    {
        print("entering performATask()");
        taskID = val;
        print("performATask() variable taskID " + taskID);
        
        try
        {
            Thread.sleep(4000);
        }catch (InterruptedException x){}
        print("performATask() woke up taskID " + taskID);
        
        print( "leaving performATask()");
    }
    
    
    public static void print(String msg)
    {
        String threadName = Thread.currentThread().getName();
        System.out.println(threadName + ": " + msg);
    }
    
    
    public static void main(String[] args)
    {
        final TestUnsynchronized tus = new TestUnsynchronized();
        
        Runnable runA = new Runnable()
        {
            public void run()
            {
                tus.performATask(3);
            }
        };
        
        Thread ta = new Thread(runA, "threadA");
        ta.start();
        
        try
        {
            Thread.sleep(2000);
        }catch (InterruptedException ie){}
        
        Runnable runB = new Runnable()
        {
            public void run()
            {
                tus.performATask(7);
            }
        };
        
        Thread tb = new Thread(runB, "threadB");
        tb.start();
    }
}