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.

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


  /**
   * @tests java.util.Timer#scheduleAtFixedRate(java.util.TimerTask,

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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;
      Date d = new Date(System.currentTimeMillis() + 100);
      try {
        t.scheduleAtFixedRate(testTask, d, 100);
      } catch (IllegalStateException e) {

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        exception = true;
      }
      assertTrue(
          "scheduleAtFixedRate with negative Date 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 Timer throws an NullPointerException if date is Null
      t = new Timer();
      testTask = new TimerTestTask();
      exception = false;

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


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

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


      // Ensure proper sequence of exceptions
      t = new Timer();
      exception = false;
      try {

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


      // Ensure a task is run at least twice
      t = new Timer();
      testTask = new TimerTestTask();
      d = new Date(System.currentTimeMillis() + 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", lastDelta < 300);
      t.cancel();
    } finally {
      if (t != null)
        t.cancel();
    }
  }

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


  protected void setUp() {
    timerCounter = 0;

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