/**
* map根据value排序
* flag = 1 正序
* flag = 0 倒序
*
* @param map
* @param flag
* @return
*/
public static > LinkedHashMap sortByValue(Map map, int flag) {
LinkedHashMap sortMap = new LinkedHashMap<>();
if (flag == 1) {
map.entrySet().stream().sorted(Comparator.comparing(Map.Entry::getValue)).forEach(entry -> sortMap.put(entry.getKey(), entry.getValue()));
} else {
map.entrySet().stream().sorted((o1, o2) -> o2.getValue().compareTo(o1.getValue())).forEach(entry -> sortMap.put(entry.getKey(), entry.getValue()));
}
return sortMap;
}
/**
* 取出map前n个
*
* @param map
* @param length
* @return
*/
@Override
public LinkedHashMap subMap(LinkedHashMap map, int length) {
List> lists = new ArrayList<>(map.entrySet());
LinkedHashMap sortedMap = new LinkedHashMap<>();
if (lists.size() >= length) {
for (Map.Entry set : lists.subList(0, length)) {
sortedMap.put(set.getKey(), set.getValue());
}
} else {
for (Map.Entry set : lists) {
sortedMap.put(set.getKey(), set.getValue());
}
}
return sortedMap;
}
