Question

Design "MyWeek" class: (1) Data members: the class contains one private data field weekList. "weekList" has datatype of ArrayList, which will contain String objects of week/weekend days. There are no duplicated days in the list. Valid days are "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun". The weekList is not necessarily to be ordered (2) Constructors The instance of MyWeek can be constructed with (a) no argument (initialized weekList to empty), or (b) with one String argument which is one valid week/weekend day, or (c) one argument which is an array of valid week/weekend days (the input can have duplicated days in an array, for example there are 2 "Fri" days in array argument; the final weekList will only contain one "Fri") (3) Methods (a) Insert: insert one day; insert a list of week/weekend days (b) Search: search for one day; (c) Delete: delete one day; delete a list of days; (d) (overriding) toString(): return text message about week/weekend days currently stored in a MyWeek instance (e) (overriding) equals(): compare to other MyWeek instance, and return true if both instances contain the same list of days, ignoring the order of these days (f) (overloading) Get a list of days from a MyWeek instance: return week/weekend days in array. The days in returned array can be ordered from Mon through Sun, or can be unordered. Implement 2 getDays() methods: (i) method without argument, return is unordered; (2) method with a tag argument, indicating the return array is ordered or not. (g) Save: save contents in MyWeek instance to a text file. Specify the file name as argument to the method (h) Load: load from the file and generate a MyWeek instance with message in the (4) Requirement: 1. Use table to list all members (data field, methods) and give brief description of the class. (Refer Homework Set 3) Properly use Java Exception handling technique to make your program robust. Write test program to test all functionalities defined with the class 2. 3.

Answer 1

Thanks for the question, here is the complete class in Java

==============================================================
import java.util.ArrayList;

public class MyWeek {

    private ArrayList<String> weekList;

    public MyWeek() {
        weekList = new ArrayList<>();

    }

    public MyWeek(String weekName) {
        if (weekName == null) {
            throw new IllegalArgumentException();
        }
        weekList = new ArrayList<>();
        weekList.add(weekName);
    }

    public MyWeek(ArrayList<String> weeks) {
        if (weeks == null) {
            throw new IllegalArgumentException();
        }
        weekList = new ArrayList<>();
        for (String name : weeks) {
            if (weekList.contains(name)) {
                continue;
            } else {
                weekList.add(name);
            }
        }
    }

    public void insert(String week) {
        weekList.add(week);
    }

    public void insert(ArrayList<String> weeks) {
        if (weeks == null) {
            throw new IllegalArgumentException();
        }
        for (String week : weeks) {
            if (weekList.contains(week)) {
                continue;
            } else {
                weekList.add(week);
            }
        }
    }

    public boolean search(String week) {
        if (week == null) {
            throw new IllegalArgumentException();
        }
        for (String weekName : weekList) {
            if (weekName.equalsIgnoreCase(week)) {
                return true;
            }
        }
        return false;
    }

    public void delete(String name) {
        if (name == null) {
            throw new IllegalArgumentException();
        }
        if (weekList.contains(name)) {
            weekList.remove(name);


        }
    }

    public void delete(ArrayList<String> names) {
        if (names == null) {
            throw new IllegalArgumentException();
        }
        for (String name : names) {
            if (weekList.contains(name)) {
                weekList.remove(name);
            }
        }
    }

    @Override
    public String toString() {
        return weekList.toString();
    }

    @Override
    public boolean equals(Object obj) {

        if (obj != null && obj instanceof MyWeek) {

            MyWeek anotherWeek = (MyWeek) obj;
            if (anotherWeek.weekList.size() != weekList.size()) {
                return false;
            }
            return weekList.containsAll(anotherWeek.weekList);

        }
        return false;
    }

}