lambda表达式(持续更新中)

List<MatchItem> matches = getList(itemCode);

//根据内容去重
itemList = itemList.stream().collect(Collectors.collectingAndThen(Collectors.toCollection(()->
        new TreeSet<>(Comparator.comparing(MatchItem::getContent))), ArrayList::new));

//合并list中的信息变成字符串(无分隔符)
String wholeValue = itemList.stream().filter(item-> StringUtils.isNotBlank(item.getContent()))
        .map(MatchItem :: getContent).collect(Collectors.joining());

//降序排列

matches.sort((a,b) -> Float.compare(b.getY(),a.getY()));
//升序

matches.sort((a,b) -> Float.compare(a.getY(),b.getY()));

//过滤list

matches = matches.stream().filter(item->!"空字符串".equals(item.getContent().trim())).collect(Collectors.toList());

/** 按照***相等分组*/
Map<Float, List<MatchItem>> groupBy = matches.stream().collect(Collectors.groupingBy(MatchItem::getY));