Clock

Implement a 1000ms clock thread Using the Observer/Observable classes create a number of listener objects that output the clock tick value each time the clock thread ticks Interface [login to view URL] has one method -- update Listener objects which implement Observer put their application logic in the update method body Class [login to view URL] serves as a base class to objects which emit periodic events to Observers. Invoke methods addObserver, and notifyObsevers in the base class to use the functionality Beware the ‘hasChanged()’ side-effect of notifyObservers! Question: How many threads are running in this exercise? Which objects run on which threads? ## Deliverables Use the following code as a starting point. import java.util.*; class Main { public static void main (String[] args){ Clock clock; int clockCycle, limit; if ([login to view URL] != 2) { [login to view URL]("usage: clockCycle limit"); [login to view URL](" clockCycle is the length, in milliseconds, of each clock tick"); [login to view URL](" limit is the number of clock ticks until all threads exit"); [login to view URL](" good values are 1000 for clockcycle, 10 for limit"); [login to view URL](-1); } clockCycle = new Integer(args[0]).intValue(); limit = new Integer(args[1]).intValue(); /* Create a new Clock object and a number of ClockWatchers to watch it. Start the clock's thread. */ } } class Clock ??? { } class ClockWatcher ???? { ] ## Platform Windows