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.

    Timer t = null;
    try {
      // Ensure a task throws an IllegalStateException after cancelled
      t = new Timer();
      TimerTestTask testTask = new TimerTestTask();
      t.cancel();
      boolean exception = false;
      try {
        t.schedule(testTask, 100, 200);
      } catch (IllegalStateException e) {
        exception = true;

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        } catch (InterruptedException e) {
        }
      }
      assertEquals("TimerTask.run() method not called after 200ms",
          1, testTask.wasRun());
      t.cancel();
      synchronized (sync) {
        try {
          sync.wait(500);
        } catch (InterruptedException e) {
        }

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        } catch (InterruptedException e) {
        }
      }
      assertEquals("TimerTask.run() method not called after 200ms",
          1, testTask.wasRun());
      t.cancel();
      t.cancel();
      t.cancel();
      synchronized (sync) {
        try {
          sync.wait(500);

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        }
      }
      assertEquals("TimerTask.run() method not called after 200ms",
          1, testTask.wasRun());
      t.cancel();
      t.cancel();
      t.cancel();
      synchronized (sync) {
        try {
          sync.wait(500);
        } catch (InterruptedException e) {

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      }
      assertEquals("TimerTask.run() method not called after 200ms",
          1, testTask.wasRun());
      t.cancel();
      t.cancel();
      t.cancel();
      synchronized (sync) {
        try {
          sync.wait(500);
        } catch (InterruptedException e) {
        }

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        } catch (InterruptedException e) {
        }
      }
      assertTrue("TimerTask.run() method should be called 5 times not "
          + testTask.wasRun(), testTask.wasRun() == 5);
      t.cancel();
      try {
        Thread.sleep(200);
      } catch (InterruptedException e) {
      }
    } finally {

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        Thread.sleep(200);
      } catch (InterruptedException e) {
      }
    } finally {
      if (t != null)
        t.cancel();
    }


  }


  /**

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            assertTrue(t.purge() <= 50);
            assertEquals(0, t.purge());
        } finally {
            if (t != null) {
                t.cancel();
            }
        }
    }


    /**

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    try {
      // Ensure a Timer throws an IllegalStateException after cancelled
      t = new Timer();
      TimerTestTask testTask = new TimerTestTask();
      Date d = new Date(System.currentTimeMillis() + 100);
      t.cancel();
      boolean exception = false;
      try {
        t.schedule(testTask, d);
      } 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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