如何从两个数组列表中删除公用值 [英] How to remove common values from two array lists

问题描述

如何从两个ArrayList中删除公用值?

How can we remove common values from two ArrayLists?

让我们考虑一下我有两个如下所示的Arraylist:

Let’s consider I have two Arraylist as shown below:

ArrayList1 = [1,2,3,4]
ArrayList1 = [2,3,4,6,7]

我希望得到的结果是:

ArrayListFinal = [1,6,7]

我该怎么办?

推荐答案

以下是您可以用来完成任务的算法:

Here is an algorithm that you could follow to accomplish the task:

• 构造两个数组的并集
• 构造两个数组的交集
• 从并集减去相交以获得结果

Java集合支持 ， 和 retainAll .使用addAll构造并集，使用retainAll构造相交，使用removeAll进行相减，像这样:

Java collections support addAll, removeAll, and retainAll. Use addAll to construct unions, retainAll for constructing intersections, and removeAll for subtraction, like this:

// Make the two lists
List<Integer> list1 = Arrays.asList(1, 2, 3, 4);
List<Integer> list2 = Arrays.asList(2, 3, 4, 6, 7);
// Prepare a union
List<Integer> union = new ArrayList<Integer>(list1);
union.addAll(list2);
// Prepare an intersection
List<Integer> intersection = new ArrayList<Integer>(list1);
intersection.retainAll(list2);
// Subtract the intersection from the union
union.removeAll(intersection);
// Print the result
for (Integer n : union) {
    System.out.println(n);
}

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