Question

Need Help finishing up MyCalendar Program:

Here are the methods:

Modifier and Type	Method	Description
boolean	add​(Event evt)	Add an event to the calendar
Event	get​(int i)	Fetch the ith Event added to the calendar
Event	get​(java.lang.String name)	Fetch the first Event in the calendar whose eventName is equal to the given name
java.util.ArrayList<Event>	list()	The list of all Events in the order that they were inserted into the calendar
int	size()	The number of events in the calendar
java.util.ArrayList<Event>	sortByDate()	A sorted list of all events, ordered by event date.
java.util.ArrayList<Event>	sortByName()	A sorted list of all events, ordered by the event names.
java.lang.String	toString()

I have everything working except for the sortByDate() and the sortByName() methods.

public java.util.ArrayList<Event> sortByName()

A sorted list of all events, ordered by the event names.

This is an Accessor. It must not affect the order that the events were added to the calendar

Returns:

a list of events ordered by the alphabetical order of the event names

*********************************************************

public java.util.ArrayList<Event> sortByDate()

A sorted list of all events, ordered by event date.

This is an Accessor. It must not affect the order that the events were added to the calendar

Returns:

a list of events ordered by event date

Here is what I have written so far.

import java.util.ArrayList;

public class MyCalendar {

private ArrayList<Event> calendar;

public TRAPSCalendar() {

calendar = new ArrayList<Event>();

}

public boolean add​(Event evt) {

return calendar.add(evt);

}

public Event get​(int i) {

if (i < 0 || i > calendar.size()) {

return null;

}

return calendar.get(i);

}

public Event get​(java.lang.String name) {

for(int i = 0; i <calendar.size(); i++) {

if(calendar.get(i).getEventName().equals(name)) {

return calendar.get(i);

}

}

return null;

}

public int size() {

return calendar.size();

}

public java.util.ArrayList<Event> list() {

//return calendar;

return new ArrayList<Event>(calendar);

}

public java.util.ArrayList<Event> sortByName() {

}

public java.util.ArrayList<Event> sortByDate() {

}

public java.lang.String toString() {

String data = "There are a total of " + calendar.size()

+ " Events on the Calendar ";

if(calendar.size() > 0) {

data += "and their names are: ";

}

for(int i = 0; i < calendar.size(); i++) {

data += "\n" + (i+1) + ". " + calendar.get(i).getEventName();

}

return data;

}

}

For the sort methods we have to follow these guidelines

You are to modify the book’s selection sort code to sort Events by date and name. You may add these methods to your MyCalendar class directly. Alternatively, you can put them in a different class and have the MyCalendar class call them as needed.

Note that the sort methods must not change the order that the MyCalendar stores its events. You should create a copy of the Event ArrayList, and sort the copy. Be sure to test that, after sorting, “get(0)” returns the first Event added to the MyCalendar.

Here is the SelectionSorty class

public class SelectionSort {

/** The method for sorting the numbers */

public static void selectionSort(double[] list) {

for (int i = 0; i < list.length - 1; i++) {

// Find the minimum in the list[i..list.length-1]

double currentMin = list[i];

int currentMinIndex = i;

for (int j = i + 1; j < list.length; j++) {

if (currentMin > list[j]) {

currentMin = list[j];

currentMinIndex = j;

}

}

// Swap list[i] with list[currentMinIndex] if necessary;

if (currentMinIndex != i) {

list[currentMinIndex] = list[i];

list[i] = currentMin;

}

}

}

}

Here is the Event Class- it works fine, but you might need it to understand my problem

public class Event {

private String name;

private String venue;

private String eventDate;

private int ticketsSold;

private int ticketPrice;

private int overhead;

public Event() {

}

public Event(String eventName, String eventVenue) {

this.name = eventName;

this.venue = eventVenue;

}

public Event(String eventName,

String eventVenue,

String date,

int ticketsSold,

int ticketPrice,

int overhead) {

this.name = eventName;

this.venue = eventVenue;

this.ticketsSold = ticketsSold;

this.ticketPrice = ticketPrice;

this.overhead = overhead;

this.eventDate = date;

}

public int compareDate(Event other) {

String x = other.getDate();

String[] arrX = x.split("-");

String y = this.getDate();

String[] arrY = y.split("-");

int o = Integer.parseInt(arrX[0]); //other event year

int o1 = Integer.parseInt(arrX[1]);// other event month

int o2 = Integer.parseInt(arrX[2]);// other event day

int t = Integer.parseInt(arrY[0]);// this even year

int t1 = Integer.parseInt(arrY[1]);// this even month

int t2 = Integer.parseInt(arrX[2]);//this even day

if(x.equals(y)) {

return 0;

}

else if(o > t){

return -1;

}

else if(o < t) {

return 1;

}

else if(o == t && o1 > t1 ) {

return -1;

}

else if (o == t && o1 == t1 && o2 > t2 ) {

return -1;

}

else {

return 1;

//if(o == t && o1 == t1 && o2 > t2 ) {

//return -1;

//} else {

//return 1;

}

}

public int compareName(Event other) {

String tN = this.getEventName();

String oN = other.getEventName();

int x = tN.compareToIgnoreCase(oN);

if(x == 0) {

return 0;

}else if (x > 0) {

return 1;

}else {

return -1;

}

}

public int compareProfit(Event other) {

int tP = this.getProfit();

int oP = other.getProfit();

if(tP == oP) {

return 0;

} else if(tP > oP) {

return 1;

} else {

return -1;

}

}

public int getBreakEvenPoint() {

int x = (int) Math.ceil(overhead/ticketPrice);

return x;

}

public String getDate() {

return eventDate;

}

public String getEventName() {

return name;

}

public String getEventVenue() {

return venue;

}

public int getOverhead() {

return overhead;

}

public int getProfit() {

return (ticketPrice * ticketsSold) - overhead;

}

public int getTicketPrice() {

return ticketPrice;

}

public int getTicketsSold() {

return ticketsSold;

}

public boolean sellTickets​(int numberOfTickets) {

this.ticketsSold = ticketsSold + numberOfTickets;

if(numberOfTickets <= 0) {

return false;

}

if(this.ticketsSold <= ticketsSold) {

return false;

} else {

return true;

}

}

public void setDate​(String date) {

this.eventDate = date;

}

public void setEventName​(String eventName) {

this.name = eventName;

}

public void setEventVenue​(String eventVenue) {

this.venue = eventVenue;

}

public void setOverhead​(int overhead) {

this.overhead = overhead;

}

public void setTicketPrice​(int ticketPrice) {

this.ticketPrice = ticketPrice;

}

public void setTicketsSold​(int ticketsSold) {

if(ticketsSold < 0) {

ticketsSold = 0;

} else {

this.ticketsSold = ticketsSold;

}

}

}

Answer 1

Given below are the modified files. It assumes that your Event class's methods compareDate() and compareName() are implemented correctly.
To indent code in eclipse , select code by pressing ctrl+a and then indent using ctrl+i
Please do rate the answer if it was helpful. Thank you

MyCalendar.java
----------
import java.util.ArrayList;

public class MyCalendar {

private ArrayList<Event> calendar;

public MyCalendar() {

calendar = new ArrayList<Event>();

}

public boolean add (Event evt) {

return calendar.add(evt);

}

public Event get (int i) {

if (i < 0 || i > calendar.size()) {

return null;

}

return calendar.get(i);

}

public Event get (java.lang.String name) {

for(int i = 0; i <calendar.size(); i++) {

if(calendar.get(i).getEventName().equals(name)) {

return calendar.get(i);

}

}

return null;

}

public int size() {

return calendar.size();

}

public java.util.ArrayList<Event> list() {

//return calendar;

return new ArrayList<Event>(calendar);

}

public java.util.ArrayList<Event> sortByName() {
ArrayList<Event> copy = new ArrayList<Event>(calendar);
SelectionSort.sortByName(copy);
return copy;
}

public java.util.ArrayList<Event> sortByDate() {
ArrayList<Event> copy = new ArrayList<Event>(calendar);
SelectionSort.sortByDate(copy);
return copy;

}

public java.lang.String toString() {

String data = "There are a total of " + calendar.size()

+ " Events on the Calendar ";

if(calendar.size() > 0) {

data += "and their names are: ";

}

for(int i = 0; i < calendar.size(); i++) {

data += "\n" + (i+1) + ". " + calendar.get(i).getEventName();

}

return data;

}

}

SelectionSort.java
--------
import java.util.ArrayList;

public class SelectionSort {

/** The method for sorting the numbers */

public static void selectionSort(double[] list) {

for (int i = 0; i < list.length - 1; i++) {

// Find the minimum in the list[i..list.length-1]

double currentMin = list[i];

int currentMinIndex = i;

for (int j = i + 1; j < list.length; j++) {

if (currentMin > list[j]) {

currentMin = list[j];

currentMinIndex = j;

}

}

// Swap list[i] with list[currentMinIndex] if necessary;

if (currentMinIndex != i) {

list[currentMinIndex] = list[i];

list[i] = currentMin;

}

}

}

public static void sortByDate(ArrayList<Event> list) {

for (int i = 0; i < list.size() - 1; i++) {

// Find the minimum in the list[i..list.length-1]

Event currentMin = list.get(i);

int currentMinIndex = i;

for (int j = i + 1; j < list.size(); j++) {

if (currentMin.compareDate(list.get(j)) > 0) {

currentMin = list.get(j);

currentMinIndex = j;

}

}

// Swap list[i] with list[currentMinIndex] if necessary;
if (currentMinIndex != i) {

list.set(currentMinIndex, list.get(i));
list.set(i, currentMin);
}
}

}

public static void sortByName(ArrayList<Event> list) {

for (int i = 0; i < list.size() - 1; i++) {

// Find the minimum in the list[i..list.length-1]

Event currentMin = list.get(i);

int currentMinIndex = i;

for (int j = i + 1; j < list.size(); j++) {

if (currentMin.compareName(list.get(j)) > 0) {

currentMin = list.get(j);

currentMinIndex = j;

}

}

// Swap list[i] with list[currentMinIndex] if necessary;
if (currentMinIndex != i) {

list.set(currentMinIndex, list.get(i));
list.set(i, currentMin);
}
}

}

}