java Stringjoin ArrayListInteger

The correct syntax to use the String.join method with an ArrayList<Integer> is as follows:

ArrayList<Integer> numbers = new ArrayList<>();
numbers.add(1);
numbers.add(2);
numbers.add(3);

String joinedString = String.join(",", numbers.toString());
System.out.println(joinedString);

This code will join the elements of the ArrayList<Integer> into a single string, separated by commas. The output will be:

[1, 2, 3]