The purpose of this assignment is to give you the opportunity to write a Java program that uses threads. You should also better  understand  the concurrent execution nature of operating systems.

You are to write a Java program using threads that does the following:

• Has a Clock thread that updates (adds 1) to a counter every second
• Has a main which does the following:
• Starts the Clock thread
• Enters a loop that does the following
  
• Asks the user to enter a command
• Reads the command
• If the command is the letter "P" prints out the value of the clock counter
  
• If the command is the letter "R" resets the clock to 0
• If the command is the letter "X" terminates the program (see if you can figure out how to terminate the thread as well as main)