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

问题描述

有没有将ArrayList拆分成不同的部分而不知道它的大小直到运行时？我知道有一种叫做的方法：

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盯着和结束范围的列表。
我的问题是，我们得到一个包含帐号的arraylist，其中包含2000,4000个帐号的数据（编码时间内不会知道数字），我需要将此符号传递给PL的IN查询/ SQL，因为IN不支持超过1000个值，我试图拆分成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：我不能使用任何像Guava等外部库.. :(
这方面的任何指南都很受欢迎。

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

推荐答案

这应该会给你所有部分：

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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