Write a class TimeOfDay that uses the exception classes defined in the previous exercise. Give it a method setTimeTo(timeString) that changes the time if timeString corresponds to a valid time of day. If not, it should throw an exception of the appropriate type.
What will be an ideal response?
See the code in TimeOfDay.java.
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What information can be obtained from a wireless beacon?
What will be an ideal response?
What would happen if the pay method were not defined as an abstract method in the StaffMember class of the Firm program?
What will be an ideal response?
Don Norman suggests organizing screens and menus functionally, designing commands and menu choices to be distinctive, and making it difficult for users to take irreversible actions. Norman also says to provide feedback about the state of the interface (e.g., changing the cursor to show whether a map interface is in zoom-in or select mode) and designing for consistency of actions (e.g., ensuring that Yes/No buttons are always displayed in the same order). State one example you have seen where you know these rules have been violated. Although this is crucial to a user interfaces success, suggest why there may be challenges to implement some of Norman’s guidelines.
What will be an ideal response?
Compute the confidence of the association rule {a}?{b}. Is the rule interesting according to the confidence measure?
Suppose we have market basket data consisting of 100 transactions and 20 items. If the support for item a is 25%, the support for item b is 90% and the support for itemset {a, b} is 20%. Let the support and confidence thresholds be 10% and 60%, respectively.