字符串排序简单的工具类，数组转list,list转数组

   public static void main(String[] args) {
     /*   String[] str = {"a", "c", "b", "x", "y", "z", "j", "h", "n", "m", "q"};*/
      /*  printArr(str);
        ArraySort(str, 1);        //练习排序方法
//        Arrays.sort(str);    排序用法
        printArr(str);*/

       /* List <String> srtList = Arrays.asList("a", "c", "b", "x", "y", "z", "j", "h", "n", "m", "q");
        ;
        //printList(arrToList(str));
        *//*ListToArr(srtList);*//*
        printArr(ListToArr(srtList));*/

        String str = "asdfghjklmnbvcxzqwertyuiop";
        System.out.println(str);

        str = StringSort(str, 1);
        System.out.println(str);
    }

    /**
     *
     * @param str 排序字符串
     * @param sortType 排序规则，0--从小到大，1--从大到小
     * @return
     */
    public static String StringSort(String str, int sortType) {

        char[] ch = str.toCharArray();
        for (int i = 0; i < ch.length; i++) {
            for (int j = i + 1; j < ch.length; j++) {
                String stri = String.valueOf(ch[i]);
                String strj = String.valueOf(ch[j]);
                if (sortType == 0) {
                    if (stri.compareTo(strj) > 0) {
                        chaSwap(ch, i, j);
                    }
                } else {
                    if (stri.compareTo(strj) < 0) {
                        chaSwap(ch, i, j);
                    }
                }
            }

        }

        str = "";
        for (int i = 0; i < ch.length; i++) {
            str += String.valueOf(ch[i]);
        }

        return str;
    }

    public static void chaSwap(char[] ch, int x, int y) {

        char temp = ch[x];
        ch[x] = ch[y];
        ch[y] = temp;
    }

    /**
     * @param arr      排序数组
     * @param SortType 排序规则，0---从小到大，1从大到小
     * @return
     */
    public static String[] ArraySort(String[] arr, int SortType) {

        if (arr == null)
            return null;

        if (null != arr && arr.length > 0) {
            int len = arr.length;

            for (int i = 0; i < len; i++) {
                for (int j = i + 1; j < len; j++) {

                    if (SortType == 0) {//从小到大排序
                        if (arr[i].compareTo(arr[j]) > 0) {
                            swap(arr, i, j);
                        }
                    } else {

                        if (arr[i].compareTo(arr[j]) < 0) {
                            swap(arr, i, j);
                        }
                    }
                }

            }

        }
        return arr;
    }

    /**
     * 交换两个元素的位置的方法
     *
     * @param arr 需要交换元素的数组
     * @param x   索引i
     * @param y   索引j
     */
    public static void swap(String[] arr, int x, int y) {

        String temp = arr[x];
        arr[x] = arr[y];
        arr[y] = temp;

    }

    /**
     * 打印字符串数组
     *
     * @param str
     */
    private static void printArr(String[] str) {
        for (int i = 0; i < str.length; i++) {
            System.out.print(str[i] + "\t");
        }
        System.out.println();
    }

    public static List <Object> arrToList(Object arr[]) {
        return Arrays.asList(arr);
    }

    private static void printList(List <Object> list) {

        for (int i = 0; i < list.size(); i++) {
            System.out.print(list.get(i) + "\t");
        }
        System.out.println();
    }

    public static String[] ListToArr(List <String> list) {

        return (String[]) list.toArray();

    }