42 List<String> list 轉 String

String[] shengQiaoArray = {"2", "5", "6", "7", "9", "89", "86", "90", "47", "44", "47", "52"}; int Index = getIndex(shengQiaoArray, animals);//調用方法 List<String> anlist = new ArrayList<>(Arrays.asList(shengQiaoArray)); List<String> an = anlist.subList(Index, anlist.size()); List<String> al = anlist.subList(0, Index);//截取list 字符串 List<String> zulist = new ArrayList<>(); zulist.addAll(an);//添加所有的list zulist.addAll(al); String str = Joiner.on(" , ").skipNulls().join(zulist); /** * 判斷數組元素 的索引 * @param arr * @param value * @return */ public static int getIndex(String[] arr, String value) { for (int i = 0; i < arr.length; i++) { if (arr[i] == value) { return i; } } return -1;//如果未找到返回-1 }