List<E> subList(int fromIndex, int toIndex);

public class TestArrayList {

  public static void main(String[] args) {
    List<Long> datas = Arrays.asList(new Long [] {1L,2L,3L,4L,5L,6L,7L});
  }
}

import java.util.Arrays;
import java.util.List;

public class TestArrayList {

  private static final Integer PAGE_SIZE = 3;
  public static void main(String[] args) {
    List<Long> datas = Arrays.asList(new Long [] {1L,2L,3L,4L,5L,6L,7L,8L});

    //总记录数
    Integer totalCount = datas.size();

    //分多少次处理
    Integer requestCount = totalCount / PAGE_SIZE;

    for (int i = 0; i <= requestCount; i++) {
      Integer fromIndex = i * PAGE_SIZE;
      //如果总数少于PAGE_SIZE,为了防止数组越界,toIndex直接使用totalCount即可
      int toIndex = Math.min(totalCount, (i + 1) * PAGE_SIZE);
      List<Long> subList = datas.subList(fromIndex, toIndex);
      System.out.println(subList);
      //总数不到一页或者刚好等于一页的时候,只需要处理一次就可以退出for循环了
      if (toIndex == totalCount) {
        break;
      }
    }

  }
}