ISM 3230 In-Class Lab Module 9 Classes Spring 2019 Construct

Ism3230 In Class Lab Module 9 Classes Spring 2019 Constructors Get

Your task is to implement a simple Clock class to keep track of the current time using 24-hour time representation. Your clock should allow the user of the Clock class to do the following:

• to create a clock with a given time. If no time is specified at the clock instantiation, the clock should set itself to midnight and print a warning message to the screen.
• to set an existing clock to a specific time with setter methods
• to use a getter method to obtain an integer that represents the current number of hours on the clock
• to use a getter method to obtain an integer that represents the current number of minutes on the clock
• to receive a string that is formatted for the screen output and represents the current time on the clock, in "HH:MM" format with leading zeros as needed.
• to advance an existing clock by an integer number of minutes forward.

To test the implementation of the Clock class, you should create a driver program that creates a clock object and uses its methods to perform some tests. The driver should:

• prompt the user for initial hours and minutes for the clock and instantiate a clock object
• print the "Initial time" as a formatted output and the hours and minutes separately as integers
• in a user-driven loop, ask the user to enter the number of minutes to advance the clock forward and print the formatted current time. The loop should:
• ensure that the number of minutes to go forward does not exceed hours. Print an error message if it does.
• terminate whenever the user enters a negative number, printing "Exiting..."
• set the current time to 12:00 with Clock's setter methods and print "Resetting clock to noon!" whenever the user enters 0.

Paper For Above instruction

The task requires designing and implementing a Clock class in Java that can accurately represent and manipulate time in a 24-hour format. This involves creating constructors, getter and setter methods, as well as a method to advance the clock by a specified number of minutes. Additionally, a driver class will facilitate user interaction, enabling the creation of a Clock object, displaying its current state, and allowing the user to simulate the passage of time through incremental advancements.

The Clock class should encapsulate private integer data members for hours and minutes, providing constructors to initialize these values either to specific times or to midnight by default. The default constructor should also print a warning message to alert the user. For setting and retrieving the time, public getter and setter methods should be provided for both hours and minutes, ensuring encapsulation principles are maintained. An essential feature is the method getCurrentTime(), which returns a formatted string of the current time with leading zeros for hours and minutes, separated by a colon (e.g., "05:30"). The method should handle the formatting efficiently, converting integers to strings and padding with zeros as needed.

Advancing time involves adding a specified number of minutes to the current time, with appropriate calculations to handle overflow beyond 59 minutes and beyond 23 hours (wrapping around to interpret the next day). The advanceTime() method will use modular arithmetic to ensure hours and minutes stay within valid ranges after addition.

The driver class, named Lab9, will interact with the user via console inputs. After prompting for initial hours and minutes, it will create a Clock object and display the initial time both as a formatted string and as separate integer values retrieved via getters. The main loop will then prompt for the number of minutes to advance the clock, check input validity, and accordingly update the clock's state. Special cases include resetting the clock to noon (12:00) when zero is input, and gracefully terminating the loop when a negative value is entered.

Throughout the implementation, careful input validation and error handling will ensure robustness. The program will demonstrate object-oriented principles, including encapsulation, method definition, and class interaction. Proper formatting, clear user prompts, and informative messages will make the program user-friendly.

References

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