Week 6 [Sep 16]

Explain in your own words the interactions illustrated by this Sequence Diagram:

Consider the code below:

class Person{
    Tag tag;
    String name;

    Person(String personName, String tagName){
        name = personName;
        tag = new Tag(tagName);
    }
}

class Tag{
    Tag(String value){
        //...
    }
}

class PersonList{
    void addPerson(Person p){
        //...
    }
}

Draw a sequence diagram to illustrate the object interactions that happen in the code snippet below:

PersonList personList = new PersonList();
while (hasRoom){
    Person p = new Person("Adam", "friend");
    personList.addPerson(p);
}

Suggest ways to improve the quality of the code below.

import java.io.FileNotFoundException;
import java.util.*;

public class CliApp {

    //...
    private static final String MESSAGE_COMMAND_HELP_PARAMETERS = "Parameters: %1$s";
    private static final String MESSAGE_COMMAND_HELP_EXAMPLE = "Example: %1$s";
    private static final String MESSAGE_DISPLAY_PERSON_DATA = "%1$s  Phone Number: %2$s  Email: %3$s";
    private static final String GOODBYE_MESSAGE = "Exiting Address Book... Good bye!";
    private static final String MESSAGE_INVALID_COMMAND_FORMAT = "Invalid command format: %1$s";
    //...

    /**
     * List of all persons in the address book.
     */
    private static final ArrayList<String> person = new ArrayList<>();


    //...

    public static void main(String[] args) {
        String userCommand = "nothing"; boolean exit = false;
        if (args.length > 0) {
            showWelcomeMessage();
            processProgramArgs(args);
            loadDataFromStorage();
            while (!exit) {
                System.out.print("Enter command: ");
                userCommand = SCANNER.nextLine();
                userCommand = userCommand.trim();
                showToUser(userCommand);
                String feedback = executeCommand(userCommand);
                showResultToUser(feedback);
            }
        } else {
            showToUser("Incorrect usage!");
        }
    }

    private static void showResultToUser(String feedback) {
        switch (feedback) {
            case "0":
                feedback = "Good (0)";
                break;
            case "1":
                feedback = "Better (1)";
                break;
        }
        try {
            writeToFile(feedback);
        } catch (FileNotFoundException e) {
            //e.printStackTrace();
        }
    }

    private static void matcher(String s1, String s2) {
        // ...
    }

    /**
     * Show the {@code message} to the user
     */
    private static void showToUser(String message) {
        System.out.println(LINE_PREFIX + message.trim()); // add LINE_PREFIX in front
    }

// ...

}