如何将数组列表分成相等的部分? [英] How to split array list into equal parts?

问题描述

有没有在运行之前不知道它的大小的情况下将 ArrayList 分成不同的部分?我知道有一种方法叫做:

Is there anyway to split ArrayList into different parts without knowing size of it until runtime? I know there is a method called:

list.subList(a,b);

但我们需要明确提及列表的起始和结束范围.我的问题是，我们得到一个包含帐号的数组列表，其中包含 2000,4000 个帐号之类的数据(在编码期间不会知道这些数字)，我需要将此帐号传递到 PL/SQL 的 IN 查询中，如IN 中不支持超过 1000 个值，我正在尝试将其拆分为多个块并将其发送到查询

but we need to explicitly mention staring and ending range of list. My problem is, we get a arraylist containing account numbers which is having data like 2000,4000 account numbers (there numbers will not be known during coding time), and I need to pass this acc nos into IN query of PL/SQL, as IN doesn't support more than 1000 values in it, I am trying to split into multiple chunks and sending it to query

注意:我不能使用任何外部库，如 Guava 等.:(感谢您提供这方面的任何指导.

Note: I cannot use any external libraries like Guava etc.. :( Any guide in this regard is appreciated.

推荐答案

这应该给你所有的部分:

This should give you all your parts :

int partitionSize = 1000;
List<List<Integer>> partitions = new LinkedList<List<Integer>>();
for (int i = 0; i < originalList.size(); i += partitionSize) {
    partitions.add(originalList.subList(i,
            Math.min(i + partitionSize, originalList.size())));
}

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