Consider an old fashioned telephone booth that can be occupied by one person at a time.Suppose one person went in and dialed a part of her number, and had to leave the booth.A second person went in and dialed a part of his number, and before the number was fully dialed, a connection to some other phone was made.What Java threads analogy would prevent this undesirable scenario?
i.Acquire the lock prior to entering the booth
II.Dial a complete number when inside the booth
III.Hang up the phone and release the lock upon exiting the booth
A)Only I
B)I and II
C)I and III
D)I, II, and III

Question

Quizplus · Accepted Answer

Acquiring the lock prior to entering the booth ensures that only one person can enter at a time. The second person will have to wait until the first person releases the lock by exiting the booth. Dialing a complete number inside the booth ensures that there is no chance of an incomplete connection being made. Hanging up the phone and releasing the lock upon exiting the booth ensures that the next person can enter and make their call without any issues. Therefore, only choices I and III are necessary to prevent the undesirable scenario.

Consider an Old Fashioned Telephone Booth That Can Be Occupied