java - 如何以相同的方式随机化两个 ArrayList？

Question

我有两个相互关联的数组列表 filelist 和 imgList，例如与“e1.jpg”相关的“H1.txt”。如何根据fileList的随机化自动随机化imgList的列表？就像在excel中一样，如果我们对某一列进行排序，另一列会自动跟随吗？

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);

随机化后的输出例如:

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"};

Answer 1

使用 Collections.shuffle()两次，用相同的种子初始化两个 Random 对象:

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

使用具有相同种子的两个 Random 对象可确保两个列表将以完全相同的方式进行混洗。这允许两个单独的集合。