Java 將map 拆分成多個map工具類

轉自 https://blog.csdn.net/q1534894305/article/details/108364758

 

開箱即用，無副作用

/**
* 將map 拆分成多個map
*
* @param chunkMap 被拆的 map
* @param chunkNum 每段的大小
* @param <k> map 的 key類 型
* @param <v> map 的value 類型
* @return List
*/
public static <k, v> List<LinkedHashMap<k, v>> mapChunk(LinkedHashMap<k, v> chunkMap, int chunkNum) {
if (chunkMap == null || chunkNum <= 0) {
List<LinkedHashMap<k, v>> list = new ArrayList<>();
list.add(chunkMap);
return list;
}
Set<k> keySet = chunkMap.keySet();
Iterator<k> iterator = keySet.iterator();
int i = 1;
List<LinkedHashMap<k, v>> total = new ArrayList<>();
LinkedHashMap<k, v> tem = new LinkedHashMap<>();
while (iterator.hasNext()) {
k next = iterator.next();
tem.put(next, chunkMap.get(next));
if (i == chunkNum) {
total.add(tem);
tem = new LinkedHashMap<>();
i = 0;
}
i++;
}
if (!CollectionUtils.isEmpty(tem)) {
total.add(tem);
}
return total;
}