如何以相同的方式随机化两个ArrayLists？ [英] How to randomize two ArrayLists in the same fashion?

问题描述

我有两个相互关联的arraylist filelist 和 imgList ，例如： H1.txt与e1.jpg有关。如何根据 fileList 的随机化自动随机化 imgList 列表？就像在Excel中一样，如果我们对某个列进行排序，另一列会自动跟随吗？

I have two arraylist filelist and imgList which related to each other, e.g. "H1.txt" related to "e1.jpg". How to automatically randomized the list of imgList according to the randomization of fileList? Like in excel, if we sort certain column, the other column will automatically follow?

String [] file = {"H1.txt","H2.txt","H3.txt","M4.txt","M5.txt","M6.txt"};
ArrayList<String> fileList = new ArrayList<String>(Arrays.asList(file));

String [] img = {"e1.jpg","e2.jpg","e3.jpg","e4.jpg","e5.jpg","e6.jpg"};
ArrayList<String> imgList = new ArrayList<String>(Arrays.asList(img));

//randomized files
Collections.shuffle(fileList);

随机化后输出例如：

fileList = {"M4.txt","M6.txt","H3.txt","M5.txt","H2.txt","H1.txt"};

预期输出：

 imgList = {"e4.jpg","e6.jpg","e3.jpg","e5.jpg","e2.jpg","e1.jpg"};

推荐答案

使用 集合.shuffle（） 两次，其中两个 Random 对象使用相同的种子初始化：

Use Collections.shuffle() twice, with two Random objects initialized with the same seed:

long seed = System.nanoTime();
Collections.shuffle(fileList, new Random(seed));
Collections.shuffle(imgList, new Random(seed));

使用两个带有相同种子的 Random 对象确保两个列表以完全相同的方式进行洗牌。这允许两个单独的集合。

Using two Random objects with the same seed ensures that both lists will be shuffled in exactly the same way. This allows for two separate collections.

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