1. CheckPoint: Interfaces and Communication Messages
Understanding object-oriented methodologies is often difficult. You already understand that object-oriented analysis and design emulates the way human beings tend to think and conceptualize problems in the everyday world. With a little practice, object-oriented programming will become second nature to you.
As an example, consider a typical house in which there are several bedrooms, a kitchen, and a laundry room—each with a distinct function. You sleep in the bedroom, you wash clothes in the laundry room, and you cook in the kitchen. Each room encapsulates all the items needed to complete the necessary tasks.
You do not have an oven in the laundry room or a washing machine in the kitchen. However, when you do the laundry, you do not just add clothes to the washer and wait in the laundry room; once the machine has started, you may go into the kitchen and start cooking dinner. But how do you know when to go back to check the laundry? When the washer buzzer sounds, a message is sent to alert you to go back into the laundry room to put in a new load. While you are folding clothes in the laundry room, the oven timer may ring to inform you that the meat loaf is done.
What you have is a set of well-defined components: Each provides a single service to communicate with the other components using simple messages when something needs to be done. If you consider a kitchen, you see it is also composed of several, smaller components, including the oven, refrigerator, and microwave. Top-level objects are composed of smaller components that do the actual work. This perspective is a very natural way of looking at our world, and one with which we are all familiar. We do the same thing in object-oriented programming:
o Identify components that perform a distinct service
o Encapsulate all the items in the component necessary to get the job done
o Identify the messages that need to be provided to the other components
Although the details can be quite complex, these details are the basic principles of object-oriented programming.
• Consider the microwave oven in your kitchen, using the object-oriented thinking described above.
• Create a table with the following four column headings: Top-Level Objects, Communicates With, Incoming Messages, and Outgoing Messages.
o Identity the top-level objects of the microwave.
o Explain some of the graphical user interfaces (GUIs) and communications messages that occur during the operation of a microwave.
• Describe some of the advantages of having a componentized system. For example, what happens if the microwave breaks?
• Post your completed CheckPoint as an attachment
I am not sure what they want.
top-level objets of the microwave
door
buttons
glass
communicates with
control panel
incoming messages
level of cooking
cooking time
start
end
outgoing messages
open door
close door
timer
Based on the provided information, it seems that you are being asked to apply object-oriented thinking to analyze the components, interfaces, and communication messages of a microwave oven in your kitchen. To complete the CheckPoint, you should create a table with the following four columns: Top-Level Objects, Communicates With, Incoming Messages, and Outgoing Messages. Then, fill in the table by identifying the top-level objects of the microwave and explaining some of the graphical user interfaces (GUIs) and communication messages that occur during its operation.
Here is an example of how you can approach this task:
1. Top-Level Objects:
- Microwave
- Control panel
- Internal cooling system
- Door latch mechanism
2. Communicates With:
- Control panel communicates with the microwave to set time, power level, and specific functions.
- Internal cooling system communicates with the microwave to regulate temperature and prevent overheating.
- Door latch mechanism communicates with the microwave to ensure proper sealing and safety.
3. Incoming Messages:
- Set Time: The user can input the desired cooking time through the control panel, and the microwave receives this message to set the timer.
- Set Power Level: The user can select the desired power level through the control panel, and the microwave receives this message to adjust the power output.
- Start: When the user presses the start button on the control panel, the microwave receives this message to initiate the cooking process.
4. Outgoing Messages:
- Cooking Progress: The microwave sends messages to the control panel to display the remaining cooking time, current power level, and any other relevant information.
- Completion Notification: When the cooking time is complete, the microwave sends a message to the control panel to signal that the food is ready.
As for the advantages of a componentized system like a microwave oven:
- Modularity: Components in a componentized system are independent and can be easily replaced or upgraded individually, allowing for flexibility and ease of maintenance.
- Reusability: Components can be reused in different contexts or combined with other compatible systems, reducing development time and cost.
- Scalability: Componentized systems can be scaled up or down by adding or removing components, making them adaptable to different requirements.
- Debugging and Troubleshooting: In case of a malfunction or breakage, it is easier to identify the specific component causing the issue and replace it without affecting the overall system.
Remember to post your completed CheckPoint as an attachment, following the instructions provided.