Examples of java.util.Timer.cancel()

java.util.Timer.cancel()
Terminates this timer, discarding any currently scheduled tasks. Does not interfere with a currently executing task (if it exists). Once a timer has been terminated, its execution thread terminates gracefully, and no more tasks may be scheduled on it.
Note that calling this method from within the run method of a timer task that was invoked by this timer absolutely guarantees that the ongoing task execution is the last task execution that will ever be performed by this timer.
This method may be called repeatedly; the second and subsequent calls have no effect.

        exception = true;
      }
      assertTrue(
          "Scheduling a task with negative date should throw IllegalArgumentException",
          exception);
      t.cancel();


      // Ensure a Timer throws a NullPointerException if the task is null
      t = new Timer();
      exception = false;
      d = new Date(System.currentTimeMillis() + 100);

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        exception = true;
      }
      assertTrue(
          "Scheduling a null task should throw NullPointerException",
          exception);
      t.cancel();


      // Ensure a Timer throws a NullPointerException if the date is null
      t = new Timer();
      testTask = new TimerTestTask();
      exception = false;

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        exception = true;
      }
      assertTrue(
          "Scheduling a null date should throw NullPointerException",
          exception);
      t.cancel();


      // Ensure proper sequence of exceptions
      t = new Timer();
      d = new Date(-100);
      exception = false;

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        exception = true;
      }
      assertTrue(
          "Scheduling a null task with negative date should throw IllegalArgumentException first",
          exception);
      t.cancel();


      // Ensure a task is run
      t = new Timer();
      testTask = new TimerTestTask();
      d = new Date(System.currentTimeMillis() + 200);

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        Thread.sleep(400);
      } catch (InterruptedException e) {
      }
      assertEquals("TimerTask.run() method not called after 200ms",
          1, testTask.wasRun());
      t.cancel();


      // Ensure multiple tasks are run
      t = new Timer();
      testTask = new TimerTestTask();
      testTask.incrementCount(true);

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      } catch (InterruptedException e) {
      }
      assertTrue(
          "Multiple tasks should have incremented counter 4 times not "
              + timerCounter, timerCounter == 4);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }

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          "Multiple tasks should have incremented counter 4 times not "
              + timerCounter, timerCounter == 4);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }


  /**
   * @tests java.util.Timer#schedule(java.util.TimerTask, long)

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    Timer t = null;
    try {
      // Ensure a Timer throws an IllegalStateException after cancelled
      t = new Timer();
      TimerTestTask testTask = new TimerTestTask();
      t.cancel();
      boolean exception = false;
      try {
        t.schedule(testTask, 100);
      } catch (IllegalStateException e) {
        exception = true;

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        exception = true;
      }
      assertTrue(
          "Scheduling a task after cancelling it should throw exception",
          exception);
      t.cancel();


      // Ensure a Timer throws an IllegalArgumentException if delay is
      // negative
      t = new Timer();
      testTask = new TimerTestTask();

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        exception = true;
      }
      assertTrue(
          "Scheduling a task with negative delay should throw IllegalArgumentException",
          exception);
      t.cancel();


      // Ensure a Timer throws a NullPointerException if the task is null
      t = new Timer();
      exception = false;
      try {

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