最近用到排序 有個集合公升序和降序都不是理想的結果，然後用了個根據下標排序的方法
listlist = new arraylist<>();
list.add("小");
list.add("雙");
list.add("單");
list.add("大");
string valstr = "大小單雙";
listslist = new arraylist();
for (string s : list)
collections.sort(slist); //對下標排序
string sortstr = "";
for (int index : slist)
system.out.println(sortstr);
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