1000개 단위로 리스트를 짜르려면, sublist 와 반복문을 사용한다.
https://stackoverflow.com/questions/5824825/efficient-way-to-divide-a-list-into-lists-of-n-size
Efficient way to divide a list into lists of n size
I have an ArrayList, which I want to divide into smaller List objects of n size, and perform an operation on each. My current method of doing this is implemented with ArrayList objects in Java. Any
stackoverflow.com
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