How can I convert an ArrayList String to String in Java

Question

I am using the toArray() method, but it is returning an object array rather than a string array

Answer 1

List<String> list = new ArrayList<String>();
String[] array = list.toArray(new String[0]);

For example:

List<String> alist = new ArrayList<String>();
alist.add("India");
alist.add("USA");
String[] stringArray = alist.toArray(new String[0]);

The toArray() method without passing any argument returns Object[].

So you have to pass an array as an argument.

Answer 2

In Java 8 or later:

String listString = String.join(", ", list);

In case the list is not of type String, a joining collector can be used:

String listString = list.stream().map(Object::toString).collect(Collectors.joining(", "));