Examples of java.util.Timer.schedule()

java.util.Timer.schedule()
Schedules the specified task for execution after the specified delay. @param task task to be scheduled. @param delay delay in milliseconds before task is to be executed. @throws IllegalArgumentException if delay is negative, ordelay + System.currentTimeMillis() is negative. @throws IllegalStateException if task was already scheduled orcancelled, or timer was cancelled.


      // Ensure proper sequence of exceptions
      t = new Timer();
      exception = false;
      try {
        t.schedule(null, -10, -10);
      } catch (NullPointerException e) {
      } catch (IllegalArgumentException e) {
        exception = true;
      }
      assertTrue(

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      t.cancel();


      // Ensure a task is run at least twice
      t = new Timer();
      testTask = new TimerTestTask();
      t.schedule(testTask, 100, 100);
      try {
        Thread.sleep(400);
      } catch (InterruptedException e) {
      }
      assertTrue(

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      // Ensure multiple tasks are run
      t = new Timer();
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 100, 100); // at least 9 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 200, 100); // at least 7 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);

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      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 100, 100); // at least 9 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 200, 100); // at least 7 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 300, 200); // at least 4 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);

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      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 200, 100); // at least 7 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 300, 200); // at least 4 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 100, 200); // at least 4 times
      try {
        Thread.sleep(1200); // Allowed more room for error

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      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 300, 200); // at least 4 times
      testTask = new TimerTestTask();
      testTask.incrementCount(true);
      t.schedule(testTask, 100, 200); // at least 4 times
      try {
        Thread.sleep(1200); // Allowed more room for error
      } catch (InterruptedException e) {
      }
      assertTrue(

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      TimerTestTask testTask = new TimerTestTask();
      Date d = new Date(System.currentTimeMillis() + 100);
      t.cancel();
      boolean exception = false;
      try {
        t.schedule(testTask, d, 100);
      } catch (IllegalStateException e) {
        exception = true;
      }
      assertTrue(
          "Scheduling a task after Timer.cancel() should throw exception",

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      d = new Date(System.currentTimeMillis() + 100);
      testTask = new TimerTestTask();
      testTask.cancel();
      exception = false;
      try {
        t.schedule(testTask, d, 100);
      } catch (IllegalStateException e) {
        exception = true;
      }
      assertTrue(
          "Scheduling a task after cancelling it should throw exception",

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      t = new Timer();
      d = new Date(-100);
      testTask = new TimerTestTask();
      exception = false;
      try {
        t.schedule(testTask, d, 100);
      } catch (IllegalArgumentException e) {
        exception = true;
      }
      assertTrue(
          "Scheduling a task with negative delay should throw IllegalArgumentException",

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      t = new Timer();
      d = new Date(System.currentTimeMillis() + 100);
      testTask = new TimerTestTask();
      exception = false;
      try {
        t.schedule(testTask, d, -100);
      } catch (IllegalArgumentException e) {
        exception = true;
      }
      assertTrue(
          "Scheduling a task with negative period should throw IllegalArgumentException",

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