Can anyone tell me if I'm using the proper code to print the occurrences in this ArrayList?
find-occurrences, java
Solution
I think these lines are your error:
int tix= theDateArray.indexOf(date);
int occurrences= Collections.frequency(theDateArray, tix);
You're looking for the frequency of the index of your date, so in your example the first index of `2017-06-09` date might be index 0? So when you do Collections.frequency ... you're looking for the frequency of `0` within your date array, to which it returns 0 (no occurences).
I would try switching it over to
// find the number of occurrences of your passed in date within the date array
int occurrences = Collections.frequency(theDateArray, date)
Problem
Okay, so what I'm trying to do is go through the ArrayList called theDateArray, do a search for a particular item in that list, and output how many times that item appears. When I test it in the main class, it just outputs the number 0 no matter what date as a String I enter in. Here is part of the class which the methods are in. I don't think as of now it's necessary to include the entire class unless it is confusing... ``` public ArrayList<String> getTicketDates(){ int i; for (i=0; i <tickets.size(); i++){ if(tickets .get(i).getPurchased()== false){ theDateArray.add(tickets.get(i).getDate()); } } for(int f=0; f<theDateArray.size();f++){ System.out.println(theDateArray.get(f)+ " "); } return theDateArray; } public int getTickets(String date){ int tix= theDateArray.indexOf(date); int occurrences= Collections.frequency(theDateArray, tix); if (tix>=0){ System.out.println(occurrences); } return occurrences; } ``` Here is the made up tickets that I'm testing in my test class.... ``` public class AmusementParkTester { public static void main(String[] args) { AmusementPark park1= new AmusementPark("Walden University Park"); park1.addTicket(777, "Child", "Noah Johnson","2017-06-09" , 27.99, false); park1.addTicket(777, "Child", "Zachary Gibson","2017-06-09" , 27.99, false); System.out.println("The dates in which tickets are available are as follows: "); park1.getTicketDates(); park1.getTickets("2017-06-09"); } } ``` Here is the output I'm getting.... ``` The dates in which tickets are available are as follows: 2017-06-09 2017-06-09 0 ``` I want the 0 to be a 2.