import java.text.BreakIterator;
import java.util.ArrayList;
import java.util.List;

public class BreakIteratorSample {
    private static List<String> breakIntoWords(String text) {
        List<String> words = new ArrayList<>();
        BreakIterator boundary = BreakIterator.getWordInstance();
        boundary.setText(text);
        for (int start = boundary.first(), end = boundary.next();
                end != BreakIterator.DONE;
                start = end, end = boundary.next()) {
            words.add(text.substring(start, end));
        }
        return words;
    }

    public static void main(String[] args) {
        List<String> words = breakIntoWords("テキスト境界を作成し使用します。");
        System.out.println(words);
    }
}