差点忘记List传的是引用

List<String> data = new ArrayList<String>();HashMap<String, List<String>> hashMap = new HashMap<String, List<String>>();hashMap.put("1", data);Log.i("test", "Hashmap size now is 1: " + hashMap.size());List<String> list = hashMap.get("1");Log.i("test", "List size must be 0:  " + list.size());data.add("8");data.add("9");Log.i("test", "List size :  " + list.size());

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可以先把List放进Map中，再操作List,反正是传引用不是传值！