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// Demonstrate thread interrupts class TGDemo { public static void main(String args[]) { MyThread mt = new MyThread(); MyThread mt2 = new MyThread(); MyThread mt3 = new MyThread(); MyThread mt4 = new MyThread(); // Create a thread group ThreadGroup tg = new ThreadGroup("My Group"); // Put Thread Thread Thread Thread each thread into the group thrd = new Thread(tg, mt, "MyThread #1"); thrd2 = new Thread(tg, mt2, "MyThread #2"); thrd3 = new Thread(tg, mt3, "MyThread #3"); thrd4 = new Thread(tg, mt4, "MyThread #4");
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// Start each thread thrdstart(); thrd2start(); thrd3start(); thrd4start(); try { // Let the other threads run for a while Threadsleep(1000); // Display active threads in group Systemoutprintln("\nThere are " + tgactiveCount() + " threads in tg"); // Enumerate the threads and display their names Systemoutprintln("Here are their names: "); Thread thrds[] = new Thread[tgactiveCount()]; tgenumerate(thrds); for(Thread t : thrds) Systemoutprintln(tgetName()); Systemoutprintln(); // Stop thrd2 Systemoutprintln("\nStopping My Thread #2"); mt2myStop(); Threadsleep(1000); // Let the threads run Systemoutprintln("\nThere are now " + tgactiveCount() + " threads in tg");
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// Interrupt all remaining threads Systemoutprintln("\nInterrupting all remaining " + "threads in the group"); tginterrupt(); } catch (InterruptedException e) { Systemoutprintln("Main thread Interrupted"); } } }
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MyThread #1 starting MyThread #2 starting MyThread #3 starting MyThread #4 starting There are 4 threads in tg Here are their names: MyThread #1 MyThread #2 MyThread #3 MyThread #4
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Stopping My Thread #2 MyThread #2 exiting There are now 3 threads in tg Interrupting all remaining threads in the group MyThread #1 interrupted MyThread #1 exiting MyThread #3 interrupted MyThread #3 exiting MyThread #4 interrupted MyThread #4 exiting
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A ThreadGroup can contain other thread groups In this situation, the ThreadGroup that contains the other groups is called the parent A ThreadGroup is given a parent when it is created By default, the parent group is the one used by the thread that creates the ThreadGroup However, you can specify to which parent group a child group belongs by using this form of the ThreadGroup constructor: ThreadGroup(ThreadGroup parent, String name) Here, parent is the parent of the object being created The name of the child ThreadGroup is passed in name
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You can obtain the parent of a ThreadGroup by calling getParent( ), shown next: nal ThreadGroup getParent( ) If the invoking ThreadGroup has no parent, then null is returned You can obtain a list of all threads in a group, including those in child groups, by using this form of enumerate( ): int enumerate(Thread[ ] thrds, boolean all) It obtains all threads in the invoking ThreadGroup and returns them in thrds If all is true, then all threads in all child groups are also obtained The number of threads actually stored in thrds is returned Be careful, however No error is reported if thrds is not large enough to hold all threads Therefore, thrds should be large enough to hold all active threads You can obtain a list of all thread groups in a group by using this form of enumerate( ): int enumerate(ThreadGroup[ ] thrdGourps) It obtains all thread groups in the invoking ThreadGroup and returns them in thrds The number of thread groups actually stored in thrdGroups is returned Be careful, however No error is reported if thrdGroups is not large enough to hold all thread groups Therefore, thrdGroups should be large enough to hold all active threads You can obtain a count of the groups by calling activeGroupCount( ) on the thread group You can obtain a list of all thread groups in a group, including those in child groups, by using this form of enumerate( ): int enumerate(ThreadGroup[ ] thrdGroups, boolean all) It works the same as the preceding method except that when all is true, all thread groups in all child groups are also obtained
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