java List常见操作有哪些

本篇内容主要讲解"java List常见操作有哪些"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"java List常见操作有哪些"吧!

迭代器

Iterator> ite = resultList.iterator();while (ite.hasNext()) {    Map result = ite.next();    ite.remove();}

排序

Collections.sort(userInfoList, new Comparator>() {    public int compare(Map o1, Map o2) {        return ((Date) o1.get("createTime")).compareTo((Date) o2.get("createTime"));    }});Collections.sort(downList, new Comparator>() {    @Override    public int compare(Map o1, Map o2) {        String timeStr1 = ObjectUtil.objToString(o1.get("statDate"));        String timeStr2 = ObjectUtil.objToString(o2.get("statDate"));        timeStr1 = timeStr1.replaceAll("(?:年|月)", "");        timeStr2 = timeStr2.replaceAll("(?:年|月)", "");        Integer yearMonth2 = Integer.valueOf("".equals(timeStr1) ? "0" : timeStr1);        Integer yearMonth3 = Integer.valueOf("".equals(timeStr2) ? "0" : timeStr2);        return yearMonth2 > yearMonth3 ? -1 : 1;    }});

去重

Set> setMap = new HashSet>();        for (int i = 0; i < md5s.size(); i++ ) {            tempList = scenesDomain.queryScenAppList(rootScenId, null, md5s.get(i), crowdDates.get(i), Constants.QUERYAPPBYSCENID_TOPSIZE);            for (Map map : tempList) {                if (setMap.add(map)) {                    appList.add(map);                }            }        }

中文排序

public static void main(String[] args) {    ArrayList list = new ArrayList();    list.add("一鸣惊人-Y");    list.add("人山人海-R");    list.add("海阔天空-H");    list.add("空前绝后-K");    list.add("后来居上-H");    Comparator