Java Data Type - 如何将句子分成部分

import java.util.StringTokenizer;

public class Main {

  private static String[] tokenize(String str) {
    StringTokenizer tokenizer = new StringTokenizer(str);
    String[] arr = new String[tokenizer.countTokens()];
    int i = 0;
    while (tokenizer.hasMoreTokens()) {
      arr[i++] = tokenizer.nextToken();
    }
    return arr;
  }

  public static void main(String[] args) {
    String[] strs = tokenize("this is a test");
    for (String s : strs)
      System.out.println(s);
  }
}