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CHAPTER 10 Multithreading
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second parameter is the number of microseconds the thread pauses In this example, we re only interested in milliseconds, so we don t need to include the second parameter (2,000 nanoseconds is 2 seconds) After the thread pauses, another statement is displayed on the screen stating that the thread is terminating The main() method of the Demo class declares four instances of the same thread by calling the constructor of the MyThread class and passing it the name of the thread Each of these is treated as a separate thread The main thread is then paused 10 seconds by a call to the sleep() method During this time, the threads continue to execute When the main thread awakens, it displays the message that the main thread is terminating Here s what is displayed on the screen when this example runs:
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Thread: 1 Thread: 2 Thread: 3 Thread: 4 Terminating Terminating Terminating Terminating Terminating
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1 2 3 4 main thread
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class MyThread implements Runnable { String tName; Thread t; MyThread (String threadName) { tName = threadName; t = new Thread (this, tName); tstart(); } public void run() { try { Systemoutprintln("Thread: " + tName ); Threadsleep(2000); } catch (InterruptedException e ) { Systemoutprintln("Exception: Thread " + tName + " interrupted"); } Systemoutprintln("Terminating thread: " + tName ); } } class Demo {
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static void main (String args []) { MyThread ("1"); MyThread ("2"); MyThread ("3"); MyThread ("4"); { Threadsleep (10000); } catch (InterruptedException e) { Systemoutprintln( "Exception: Thread main interrupted"); } Systemoutprintln( "Terminating thread: main thread");
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Using isAlive() and join()
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Typically, the main thread is the last thread to finish in a program However, there isn t any guarantee that the main thread won t finish before a child thread finishes In the previous example, we told the main method to sleep until the child threads terminate However, we estimated the time it takes for the child threads to complete processing If our estimate was too short, a child thread could terminate after the main thread terminates Therefore, the sleep technique isn t the best one to use to guarantee that the main thread terminates last Programmers use two other techniques to ensure that the main thread is the last thread to terminate These techniques involve calling the isAlive() method and the join() method Both of these methods are defined in the Thread class The isAlive() method determines whether a thread is still running If it is, the isAlive() method returns a Boolean true value; otherwise, a Boolean false is returned You can use the isAlive() method to examine whether a child thread continues to run The join() method works differently than the isAlive() method The join() method waits until the child thread terminates and joins the main thread In addition, you can use the join() method to specify the amount of time you want to wait for a child thread to terminate The following example illustrates how to use the isAlive() method and the join() method in your program This example is nearly the same as the previous example The difference lies in the main() method of the Demo class definition
CHAPTER 10 Multithreading
After the threads are declared using the constructor of the MyThread class, the isAlive() method is called for each thread The value returned by the isAlive() method is then displayed on the screen Next, the join() method is called for each thread The join() method causes the main thread to wait for all child threads to complete processing before the main thread terminates Here is what is displayed on the screen when this program runs:
Thread Status: Alive Thread 1: true Thread 2: true Thread 3: true Thread 4: true Threads Joining Thread: 1 Thread: 2 Thread: 3 Thread: 4 Terminating thread: 1 Terminating thread: 2 Terminating thread: 3 Terminating thread: 4 Thread Status: Alive Thread 1: false Thread 2: false Thread 3: false Thread 4: false Terminating thread: main thread class MyThread implements Runnable { String tName; Thread t; MyThread (String threadName) { tName = threadName; t = new Thread (this, tName); tstart(); } public void run() { try { Systemoutprintln("Thread: " + tName ); Threadsleep(2000); } catch (InterruptedException e ) { Systemoutprintln("Exception: Thread " + tName + " interrupted");
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