ArrayList to Array

Question

How do I convert this ArrayList's value into an array? So it can look like,

String[] textfile = ... ;

The values are Strings (words in the text file), and there are more than a 1000 words. In this case I cannot do the, words.add("") 1000 times. How can I then put this list into an array?

    public static void main(String[]args) throws IOException
    {
        Scanner scan = new Scanner(System.in);
        String stringSearch = scan.nextLine();

        List<String> words = new ArrayList<String>(); //convert to array
        BufferedReader reader = new BufferedReader(new FileReader("File1.txt"));

        String line;
        while ((line = reader.readLine()) != null) {                
            words.add(line);
        }

Answer 1

You can use

String[] textfile = words.toArray(new String[words.size()]);

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Relevant Documentation

• List#toArray(T[])

Answer 2

words.toArray() should work fine.

List<String> words = new ArrayList<String>();
String[] wordsArray = (String[]) words.toArray();

Answer 3

you can use the toArray method of Collection such as shown here

Collection toArray example

Answer 4

List<String> words = new ArrayList<String>();
words.add("w1");
words.add("w2");
String[] textfile = new String[words.size()];
textfile = words.toArray(textfile);