How to separate until last element of ArrayList in android

Question

I need to assign an ArrayList's data into a String variable.

Using following code I am getting tempSeats equals jack, ravi, mike,

 ArrayList<String> userSelectedSeats = new ArrayList<String>();
   userSelectedSeats.add("jack");
   userSelectedSeats.add("ravi");
   userSelectedSeats.add("mike");

   for (String s : userSelectedSeats) {
     tempSeats += s + ", ";
   }

but output should be jack, ravi, mike What modification should I do to my code?

Answer 1

Let Java's streams do the heavy lifting for you:

String tempSeats = userSelectedSeats.stream().collect(Collectors.joining(", "));

Answer 2

You're adding a comma after the end of every item, even the last item. You only want to add a comma if the item isn't the last item in the list. This is called joining.

If you're using Java 8, you can do

userSelectedSeats.stream().collect(Collectors.joining(", "))

Otherwise see this question for further info.

Answer 3

A simple String.join will accomplish the task at hand.

String result = String.join(", ", userSelectedSeats);

Answer 4

String c;

  ArrayList<String> userSelectedSeats = new ArrayList<String>();
       userSelectedSeats.add("jack");
       userSelectedSeats.add("ravi");
       userSelectedSeats.add("mike");

       for (int i=0; i < userSelectSeats.length(); i++)
        c += userSelectSeats.get(i).toString()+ ",";

Answer 5

Replace the for loop with this,

tempSeats = TextUtils.join(", ",userSelectedSeats);

Hope it helps!