Java String camel case

public class Main {

  public static void main(String[] args) {

    String str = "have a nice day";
    String[] str1 = str.split(" ");
    String ans = "";
    for (int i = 0; i < str1.length; i++) {
      if (i != 0) {
        char ch = str1[i].charAt(0);
        ch = (char) (ch - 32);
        str1[i] = ch + str1[i].substring(1, str1[i].length());
      }/*from ww w . j  a  v a2 s .  co  m*/
      ans += str1[i];
    }
    System.out.println(ans);
  }
}