An instance of list segmentation in Java

An instance of list segmentation in Java

Problem: suppose system a finds a large list, and now system B wants to get this list to export the report, but the deployment environment of system B is limited and the memory can't accommodate such a large list. At this time, we need to segment the list and export it one by one.

If we follow the traditional method, it may be cumbersome. We can use the sublist method in list to implement it. The code is as follows:

Test:

1、flag = 1

2、flag = 2

3、flag = 10

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