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 null task 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 dates should throw IllegalArgumentException first",
          exception);
      t.cancel();


      // Ensure a task is run at least twice
      t = new Timer();
      d = new Date(System.currentTimeMillis() + 100);
      testTask = new TimerTestTask();

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      } catch (InterruptedException e) {
      }
      assertTrue(
          "TimerTask.run() method should have been called at least twice ("
              + testTask.wasRun() + ")", testTask.wasRun() >= 2);
      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 24 times not "
              + timerCounter, timerCounter >= 24);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }

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          "Multiple tasks should have incremented counter 24 times not "
              + timerCounter, timerCounter >= 24);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }


  /**
   * @tests java.util.Timer#scheduleAtFixedRate(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.scheduleAtFixedRate(testTask, 100, 100);
      } catch (IllegalStateException e) {
        exception = true;

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


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

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        exception = true;
      }
      assertTrue(
          "scheduleAtFixedRate with negative period should throw IllegalArgumentException",
          exception);
      t.cancel();


      // Ensure a task is run at least twice
      t = new Timer();
      testTask = new TimerTestTask();
      t.scheduleAtFixedRate(testTask, 100, 100);

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      } catch (InterruptedException e) {
      }
      assertTrue(
          "TimerTask.run() method should have been called at least twice ("
              + testTask.wasRun() + ")", testTask.wasRun() >= 2);
      t.cancel();


      class SlowThenFastTask extends TimerTask {
        int wasRun = 0;


        long startedAt;

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      } catch (InterruptedException e) {
      }
      long lastDelta = slowThenFastTask.lastDelta();
      assertTrue("Fixed Rate Schedule should catch up, but is off by "
          + lastDelta + " ms", slowThenFastTask.lastDelta < 300);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }

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