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When created, a Thread instance will be of the same type as its creating thread Therefore, if a user thread creates a thread, then it will be a user thread by default When a daemon thread creates a thread, the new thread is automatically a daemon thread To change a user thread into a daemon thread, call setDaemon( ) shown here: nal void setDaemon(boolean how) If how is true, the thread will set to daemon If how is false, the thread will be set to user In both cases, setDaemon( ) must be called before the thread is started This means that it must be called before start( ) is invoked If you call setDaemon( ) on an active thread, IllegalThreadStateException is thrown You can determine if a thread is daemon or user by calling isDaemon( ), shown here: nal boolean isDaemon( ) It returns true if the invoking thread is daemon and false if it is user
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Here is a simple example that illustrates a daemon thread In the program the daemon thread executes an infinite loop that displays periods Thus, it will continue to execute until the program ends The main thread sleeps for ten seconds and then ends Because the main thread was the only user thread in the program, the daemon thread is automatically terminated when the main thread ends
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// Demonstrate a daemon thread // This class creates a daemon thread class MyDaemon implements Runnable { Thread thrd;
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MyDaemon() { // Create the thread thrd = new Thread(this); // Set to daemon thrdsetDaemon(true); // Start the thread thrdstart(); } // Entry point of thread // It displays a period once a second public void run() { try { for(;;) { Systemoutprint(""); Threadsleep(1000); } } catch(InterruptedException exc) { Systemoutprintln("MyDaemon interrupted"); } } } class DaemonDemo { public static void main(String args[]) { // Construct and start running a MyDaemon thread MyDaemon dt = new MyDaemon(); if(dtthrdisDaemon()) Systemoutprintln("dt is a daemon thread"); // Keep the main thread alive for 10 seconds Systemoutprintln("Sleeping in main thread"); try { Threadsleep(10000); } catch(InterruptedException exc) { Systemoutprintln("Main thread interrupted"); } Systemoutprintln("\nMain thread ending"); // At this point, the daemon thread will // automatically terminate } }
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dt is a daemon thread Sleeping in main thread Main thread ending
As you can see, the daemon thread automatically ends when the application ends As an experiment, try commenting out the line that marks the thread as daemon, as shown here:
// thrdsetDaemon(true);
Next, recompile and execute the program As you will see, the application no longer ends when the main thread ends, and the periods continue to be displayed (You will need to use CTRL-C to stop the program)
Bonus Example: A Simple Reminder Class
A good use for a background thread is a service that performs some activity at a predetermined time, waiting silently until the time arrives One such service is a reminder that pops up a message at a specified time to remind you about some event, such as an appointment, meeting, or conference call The following example creates a simple reminder class called Reminder that implements such a feature Reminder creates a thread that waits until a specified time in the future and then displays a message Reminder is not designed as a stand-alone program Rather, it is designed to be used as an accessory to a larger application For this reason, it is implemented as a daemon thread If the application using a Reminder instance terminates before the target time has been reached, the Reminder thread will be automatically terminated It won t hang the application, waiting for the target time to be reached It also means that there is no need to explicitly stop the thread when the application ends Reminder lets you specify the time at which to be reminded in two ways First, you can use a delay period, which is in terms of seconds This delay is then added to the current system time The reminding message will be displayed after the delay has passed This approach is good for reminders that are needed in the near future Second, you can specify a Calendar object that contains the time and date at which you want to receive the reminder This way is good for reminders that are needed in a more distant future
// // // // // // // // // // A simple reminder class that runs as a daemon thread To use Reminder, pass in the message to display and then specify either a delay from the current time, or the future time that you want to have the reminder message displayed If the application that creates a Reminder ends before the target time, then the Reminder thread is automatically terminated
import javautil*;
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