通用util将列表分成批 [英] Common util to break a list into batch
问题描述
我自己写了一个工具,将一个列表分成给定大小的批次。我只想知道这是否已经有任何apache commons util。
I wrote myself a util to break a list into batches of given size. I just wanted to know if there is already any apache commons util for this.
public static <T> List<List<T>> getBatches(List<T> collection,int batchSize){
int i = 0;
List<List<T>> batches = new ArrayList<List<T>>();
while(i<collection.size()){
int nextInc = Math.min(collection.size()-i,batchSize);
List<T> batch = collection.subList(i,i+nextInc);
batches.add(batch);
i = i + nextInc;
}
return batches;
}
请让我知道, p>
Please let me know if there any existing util already for the same.
推荐答案
查看 Lists.partition(java.util.List,int)
来自 Google Guava :
返回列表的连续子列表,每个列表大小相同(最终列表可能较小)。例如,使用分区大小3划分包含
[a,b,c,d,e]
的列表会得到[[a,b, c]
,[d,e]]
- 一个外部列表,包含两个内部列表的三个和两个元素,
Returns consecutive sublists of a list, each of the same size (the final list may be smaller). For example, partitioning a list containing
[a, b, c, d, e]
with a partition size of 3 yields[[a, b, c]
,[d, e]]
-- an outer list containing two inner lists of three and two elements, all in the original order.
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