APCS: AP Computer Science A @sfhs

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Make a clock class which has three int instance variables for hours, minutes and seconds.

It should also hale a tick() method that advances the time by adding to the seconds. If there is more than 59, it should go back to 0, and advance the minutes. If there are more than 59 minutes, it should go back to 0, and advance the hours. If there are more than 23 hours, it goes back to 0.

It needs a toString method that returns a string that has leading zeros ( as in “00:07:05” )

The Clock tester class below can be used to check your work.

clocktester.java

What else?

1. Make a subclass of your Clock class called FancyClock that keeps track of days and/or milliseconds. The toString method needs to be adjusted as well.
2. Make a subclass of your Clock class called AlarmClock. The tick method needs to be enhanced so it checks to see if the alarm should be turned on.