List the and describe four categories into which classes fall.
What will be an ideal response?
1. Entity classes represent real-world items, such as people and things.
2. Boundary, or interface, classes provide a means for users to work with the system.
3. Abstract classes are classes that cannot be directly instantiated.
4. Control, or active, classes are used to control the flow of activities, and they act as a coordinator when implementing classes.
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Which of the following statements is false?
a. A runnable thread can enter the timed waiting state for a specified interval of time. It transitions back to the runnable state when that time interval expires or when the event it’s waiting for occurs. b. Timed waiting threads and waiting threads can use a processor, if one is available. c. A runnable thread can transition to the timed waiting state if it provides an optional wait interval when it’s waiting for another thread to perform a task. Such a thread returns to the runnable state when it’s notified by another thread or when the timed interval expires—whichever comes first. d. Another way to place a thread in the timed waiting state is to put a runnable thread to sleep—a sleeping thread remains in the timed waiting state for a designated period of time (called a sleep interval), after which it returns to the runnable state.
Asynchronous transmission is more efficient than synchronous transmission
a. when there are small data blocks b. when there are large data blocks c. in all cases d. when transmission speeds are high
All Access events are triggered by the user.
Answer the following statement true (T) or false (F)
Which of the following is a network of several servers, like those in the accompanying figure, together in a single location?
A. server farm B. server unit C. server mainframe D. server aggregate