Java Incompatible Types Error Arraylists

Question

I'm using BlueJ as an IDE and whenever I try to compile this Java code it gives me an error: incompatible types highlighting the brackets of:

s.getCourtSportArrayList()

Why this is happening?

public void showCourtBookings()
{
 for(Sport s : sportList)
 {
   for(Court c : s.getCourtSportArrayList() )
   {
     System.out.println("Court: " + c.getCourt);
     int i;
     i=1;
     for(Booking b : c.getBookings())
     {  
         System.out.println("Booking: " + i + "Start Time: " + b.getTimeStart() + "End Time :" + b.getEndTime());
         i = i + 1;
     }
   }
 }  
}

This is a class Club, it contains two ArrayLists;

private ArrayList<Member> MemberList;
private ArrayList<Sport> sportList;

The Sport class has the following ArrayList:

private ArrayList<Court> CourtList = new ArrayList<Court>();

The Court class has these ArrayLists:

private ArrayList<Booking> listBooking;

Hopefully you can point me in the right direction. Thanks!

Edit: this is the code,

public ArrayList getCourtSportArrayList()
{
  return CourtList;
}

Shouldn't c.getCourt be c.getCourt()?

Alex
– Alex

2013-04-25 09:11:05 +00:00
Commented Apr 25, 2013 at 9:11 — Alex
– Alex, Commented Apr 25, 2013 at 9:11
What is the code of getCourtSportArrayList()?

Étienne Miret
– Étienne Miret

2013-04-25 09:11:34 +00:00
Commented Apr 25, 2013 at 9:11 — Étienne Miret
– Étienne Miret, Commented Apr 25, 2013 at 9:11

luksch · Accepted Answer · 2013-04-25 09:23:27Z

1

The getCourtSportArrayList() seems to be a method of your Sport class. This method needs to return a List<Court> which it apparently does not right now.

in result the method should look like this:

public List<Court> getCourtSportArrayList()
{
   return CourtList;
}

Side note: You should specify the generic Type List<Court> instead of ArrayList<Court> unless you use specific implementation details of ArrayList.

edited Apr 25, 2013 at 9:23

answered Apr 25, 2013 at 9:12

luksch

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4 Comments

user2277729 Over a year ago

It does though... or did I write it incorrectly? public ArrayList getCourtSportArrayList() { return CourtList; }

luksch Over a year ago

Java does not magically add getter and setter methods to your private member objects like private ArrayList<Court> CourtList. You need to code this explicitly.

luksch Over a year ago

You need to specify the type! public List<Court> getCourtSportArrayList() { return CourtList; }

user2277729 Over a year ago

I've had to find a workaround for using ArrayLists since Iv'e been declaring them incorrectly in the method signatures this entire time. Thankyou :)

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