how to get input from barcode reader in java Multithreading in Java

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Multithreading
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SwingUtilitiesinvokeLater(new Runnable() { public void run() { // Pop up a window when the time is up // First, create a window for the message jfrm = new JFrame(); // Set its size For the sake of simplicity, // an arbitrary size is used here However, // you can compute an exact size to fit the // message if you want jfrmsetSize(200, 50); // Create a label that contains the message JLabel jlab = new JLabel(message); // Add the message to the window jfrmadd(jlab); // Show the window jfrmsetVisible(true); } }); // Pause for 5 seconds Threadsleep(5000); // Now, remove the window SwingUtilitiesinvokeLater(new Runnable() { public void run() { // Remove the window from the screen jfrmsetVisible(false); // Remove the window from the system jfrmdispose(); } }); break; // let the thread end } Threadsleep(1000); } } catch(InterruptedException exc) { Systemoutprintln("Reminder interrupted"); } }
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You will also need to import javaxswing* and add the following instance variable to the Reminder class:
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JFrame jfrm;
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As the comment before the call to invokeLater( ) states, Sun currently recommends that all Swing GUIs be constructed and updated from the event-dispatching thread to avoid problems Therefore, this approach is used here (For more information about Swing and Swing recipes, see 8)
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Even though a daemon thread is automatically terminated when the application using it ends, it is still possible for a daemon thread to terminate on its own For example, this version of run( ) from the first example will terminate after five iterations:
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public void run() { try { for(int i=0; i < 5; i++) { Systemoutprint(""); Threadsleep(1000); } } catch(InterruptedException exc) { Systemoutprintln("MyDaemon interrupted"); } Systemoutprintln("Daemon thread ending"); }
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Of course, in practice, if a thread has a well-defined termination point, then you won t usually mark it as a daemon However, you might want to terminate a daemon thread in cases in which a background service is not needed because some precondition is not met In such a case, terminating the thread removes it from the system, eliminating its impact on performance
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Interrupt a Thread
Key Ingredients
Classes javalangThread Methods static boolean interrupted( ) void interrupt( )
Sometimes it is useful for one thread to be able to interrupt another For example, a thread might be waiting for a resource that is no longer available (such as a network connection that has been lost) A second thread could interrupt the first thread, possibly allowing an alternative resource to be used Fortunately, Java makes it easy for one thread to interrupt another because the Thread class defines methods for this purpose This recipe demonstrates their use
7:
Multithreading
Step-by-Step
To interrupt a thread involves these steps: 1 To interrupt a thread, call interrupt( ) on the thread 2 To determine if a thread is interrupted, call interrupted( )
Discussion
One thread can interrupt another by calling interrupt( ) on the Thread instance It is shown here: void interrupt( ) The interrupt( ) method has somewhat different effects, depending upon what the interrupted thread is doing If the thread is not suspended, then calling interrupt( ) results in the thread s interrupt status being set The interrupt status can be determined by calling interrupted( ) or isInterrupted( ), described shortly If the thread is in a wait state, then three possible scenarios are possible The first, and the most common, situation in which a suspended thread is interrupted occurs when the thread is waiting for a call to sleep( ), wait( ), or join( ) to return In this case, calling interrupted( ) results in an InterruptedException being sent to the interrupted thread In the process, the thread s interrupt status is cleared Two other less common situations are also possible If the thread is waiting on an instance of InterruptableChannel, then calling interrupt( ) results in a ClosedByInterruptException and its interrupt status is set If the thread is waiting on a Selector, then calling interrupt( ) causes the interrupted state to be set and the selector returns as if a call to wakeup( ) had taken place You can determine if a thread has been interrupted by calling either interrupted( ) or isInterrupted( ) The method used by this recipe is interrupted( ) and it is shown here: static boolean interrupted( ) It returns true if the invoking thread has been interrupted and false otherwise In the process, the interrupted status of the thread is cleared
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