打印出数组中的元素，最后一个单词除外，元素之间用逗号隔开

如果第一个单词存在，请自行打印。然后先将模式打印为逗号，然后再打印下一个元素。

if (arrayListWords.length >= 1) {    System.out.print(arrayListWords[0]);}// note that i starts at 1, since we already printed the element at index 0for (int i = 1; i < arrayListWords.length, i++) {      System.out.print(", " + arrayListWords[i]);}

使用时

List

Iterator

// assume StringIterator<String> it = arrayListWords.iterator();if (it.hasNext()) {    System.out.print(it.next());}while (it.hasNext()) {    System.out.print(", " + it.next());}