Problem 3
Using the UML graphical notation for object classes, design the following object classes, identifying attributes and operations. Use your own experience to decide on the attributes and operations that should be associated with these objects. a messaging system on a mobile (cell) phone or tablet a printer for a personal computer a personal music system a bank account a library catalogue
Problem 4
A shape can be classified into 2 -D and 3 -D. Design an inheritance hierarchy that will include different kinds of 2-D and 3 -D shapes. Make sure you identify at least five other classes of shapes.
Problem 5
Develop the design of the weather station to show the interaction between the data collection subsystem and the instruments that collect weather data. Use sequence diagrams to show this interaction.
Problem 6
Identify possible objects in the following systems and develop an object- oriented design for them. You may make any reasonable assumptions about the systems when deriving the design. A group diary and time management system is intended to support the timetabling of meetings and appointments across a group of co-workers. When an appointment is to be made that involves a number of people, the system finds a common slot in each of their diaries and arranges the appointment for that time. If no common slots are available, it interacts with the user to rearrange his or her personal diary to make room for the appointment. A filling station (gas station) is to be set up for fully automated operation. Drivers swipe their credit card through a reader connected to the pump; the card is verified by communication with a credit company computer, and a fuel limit is established. The driver may then take the fuel required. When fuel delivery is complete and the pump hose is returned to its holster, the driver's credit card account is debited with the cost of the fuel taken. The credit card is returned after debiting. If the card is invalid, the pump returns it before fuel is dispensed.
Problem 9
When code is integrated into a larger system, problems may surface. Explain how configuration management can be useful when handling such problems.
Problem 10
A small company has developed a specialized software product that it configures specially for each customer. New customers usually have specific requirements to be incorporated into their system, and they pay for these to be developed and integrated with the product. The software company has an opportunity to bid for a new contract, which would more than double its customer base. The new customer wishes to have some involvement in the configuration of the system. Explain why, in these circumstances, it might be a good idea for the company owning the software to make it open source.
