如何从ArrayList(Java)中的字符串数组打印字符串组合 [英] How to print combinations of Strings from String arrays in an ArrayList (Java)

问题描述

所以我有一个ArrayList<String[]>列表，其中包含一些我需要获取其组合的String[].

So I have an ArrayList<String[]> list which contains some String[] that I need to get the combinations of.

所以如果列表包含A = {a,b,c}并且B = {d,e,f}我想打印

So if list contained A = {a,b,c} and B = {d,e,f} I want to print

ad，ae，af，bd，be，bf，cd，ce，cf

我只是很难看到我将如何拥有一个固定的阵列然后得到另一个固定的阵列，所以我可以遍历那个固定的阵列.

I am just having trouble seeing how I would have one fixed array then get the other so I can iterate through that.

为澄清起见，我正在尝试对N String[]执行此操作，因此我不能只获取第0个元素和第一个元素.

To clarify I am trying to do this for N String[] so I cant just get the 0th and 1st element.

推荐答案

迭代两个数组，并在每个步骤上创建新的字符串组合.毕竟只是以某种方式打印组合.

Iterate over two arrays and on each step make new string combination. After all just print combinations in some way.

    List<String[]> input = ...;
    Set<String> allCombinations = new HashSet<>();
    for (int i = 0; i < input.size() - 1; i++) {
        for (int j = i + 1; j < input.size(); j++) {
            allCombinations.addAll(twoArraysCombinations(input.get(i), input.get(j)));
        }
    }
    // print allCombinations


private static Set<String> twoArraysCombinations(String[] first, String[] second) {
    Set<String> result = new HashSet<>();
    for (String f : first) {
        for (String s : second) {
            result.add(f + s);
        }
    }
    return result;
}

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