多个数组列表的逻辑连接 [英] Logical conjunction for multiple arraylists

问题描述

有多个arraylists(arraylists的数量是先验未知的).在每个数组列表中，我需要找到一个元素，该元素提供与来自其他列表的元素的逻辑连接.请注意，仅对非空值进行比较.

There are multiple arraylists (the number of arraylists is apriori unknown). In each arraylist I need to find an element that provides logical conjunction with elements from other lists. Note that the comparison is made only for non-null values.

ArrayList<Integer[]> list1 = new ArrayList<Integer[]>();
ArrayList<Integer[]> list2 = new ArrayList<Integer[]>();
ArrayList<Integer[]> list3 = new ArrayList<Integer[]>();

list1.add(new Integer[]{1,2,3,4});
list1.add(new Integer[]{1,4,5,6});

list2.add(new Integer[]{1,4,null,null});

list3.add(new Integer[]{null,null,null,5});
list3.add(new Integer[]{null,null,null,6});

在这种情况下，答案应该是:

In this case the answer should be:

list1: {1,4,5,6}
list2: {1,4,null,null}
list3: {null,null,null,6}

由于数组列表的数量是先验未知的，所以我想使用递归.但是，也许有更简单的解决方案?

Since the number of arraylists is apriori unknown, I thought to use recursion. However, perhaps there might be simpler solutions?

推荐答案

听起来您可能想要使用 Google 出色的 番石榴库.查看集合类.

Sounds like you might want to use Google's excellent guava-libraries. Check out the Sets class.

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