Java Data Type - 如何反向字符串由Word

public class Main {

  public static void main(String[] args) {
    String s = new String(revStr("hello brave new world"));
    String st = new String(revWords("hello brave new world"));
    System.out.println(s);
    System.out.println(st);
  }

  public static String revStr(String s) {
    StringBuilder sb = new StringBuilder();
    for (int i = s.length() - 1; i >= 0; i--) {
      sb.append(s.charAt(i));
    }
    return sb.toString();
  }

  public static String revWords(String str) {
    StringBuilder sb = new StringBuilder();
    String revd = revStr(str);
    for (String s : revd.split(" ")) {
      sb.append(revStr(s));
      sb.append(" ");
    }
    return sb.toString();
  }

}