Java - remove last known item from ArrayList

Question

OK, so here is my ArrayList:

private List<ClientThread> clients = new ArrayList<ClientThread>(); 

and here is what I am trying to do:
I am trying to remove the last known item from the ArrayList I posted above. I'm trying to do this with the code below:

    } catch(SocketException re) {                               String hey = clients.get(clients.size());                             ClientThread.remove(hey);                             System.out.println(hey + " has logged out.");                             System.out.println("CONNECTED PLAYERS: " + clients.size()); } 

but I am getting this error:

C:\wamp\www\mystikrpg\Server.java:147: incompatible types found   : Server.ClientThread required: java.lang.String                         String hey = clients.get(clients.size());                                                 ^ C:\wamp\www\mystikrpg\Server.java:148: cannot find symbol symbol  : method remove(java.lang.String) location: class Server.ClientThread                         ClientThread.remove(hey);                                     ^ 2 errors 

What am I doing wrong? It's supposed to remove the last known item from my ArrayList.

Answer 1

It should be:

ClientThread hey = clients.get(clients.size() - 1); clients.remove(hey); 

Or you can do

clients.remove(clients.size() - 1); 

The minus ones are because size() returns the number of elements, but the ArrayList's first element's index is 0 and not 1.

Answer 2

The compiler complains that you are trying something of a list of ClientThread objects to a String. Either change the type of hey to ClientThread or clients to List<String>.

In addition: Valid indices for lists are from 0 to size()-1.

So you probably want to write

   String hey = clients.get(clients.size()-1);