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Home / Questions / Q 4841
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What is daemon thread?

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What is daemon thread?

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    1. Learner

      A daemon thread is a thread that does not prevent the JVM from exiting when the program finishes but the thread is still running. An example for a daemon thread is the garbage collection.

      The basic Example: 

      public class DaemonThreadExp extends Thread {
      public void run() {
      System.out.println("Entering to the run method..");

      try {
      System.out.println("In the run Method: currentThread() is" + Thread.currentThread());

      while (true) {
      try {
      Thread.sleep(1000);
      } catch (InterruptedException x) {}

      System.out.println("In the run method: woke up again");
      }
      } finally {
      System.out.println("Leaving from the run Method");
      }
      }
      public static void main(String[] args) {
      System.out.println("Entering the main Method");

      DaemonThreadExp t = new DaemonThreadExp();
      t.setDaemon(true);
      t.start();

      try {
      Thread.sleep(5000);
      } catch (InterruptedException x) {}

      System.out.println("Leaving from the main method");
      }

      }

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