如何在java中以相同的顺序混洗两个数组 [英] How do I shuffle two arrays in same order in java

问题描述

我有两个问题和答案数组

I've got two arrays of question and answers

String questions[] = {
"Q1?",
"Q2?",
"Q3?"};

String answers[] = {
    "A1?",
    "A2?",
    "A3?"};

我用 Collections.shuffle（Arrays.asList（questions）; 对每个数组进行洗牌。如何对每个数组进行洗牌，以便在洗牌后它们保持相同的顺序？

I used Collections.shuffle(Arrays.asList(questions); to shuffle each arrays. How do I shuffle each array so that after shuffling they maintain same order?

推荐答案

你可以改为一个包含索引的新数组。然后从第一个索引中获取两个数组中的元素。

You can rather shuffle a new array which holds the indices. And then get the elements from both array from the first index.

List<Integer> indexArray = Arrays.asList(0, 1, 2);

Collections.shuffle(indexArray);

String question = questions[indexArray.get(0)];
String answer = answers[indexArray.get(0)];

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当然，创建一个类包含问题和答案将是一种更为OO的方式，正如其他答案所暗示的那样。那样，你只需维护一个 List 或 array ，与当前方法中的 3数组相比。

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Of course, creating a class containing questions and answers would be a more OO way, as other answers suggest. That way, you would have to maintain just one List or array, as compared to 3 arrays in the current approach.

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