从数组列表中删除最后一个随机字符串

问题描述

我正在制作一个显示文件中随机行的程序，但我对数组列表有点陌生.我想在显示而不是从文件中删除 arraylist 中最近的随机行.这是因为我不想重复.这是我的代码:

I'm making a program that displays random lines from a file but I'm a bit new to arraylists. I want to remove the most previous random line from the arraylist after it's displayed but not from the file. This is because I don't want it to be repeated. Here's my code:

try {
    Random random = new Random();
    int randomInt = random.nextInt(50);
    FileReader fr = new FileReader(file);
    BufferedReader reader = new BufferedReader(new FileReader(file));
    String line = reader.readLine();
    if (line.contains("!")) {
        List<String> lines = new ArrayList<>();
        while (line != null) {
            lines.add(line);
            line = reader.readLine();
            Random r = new Random();
            String rdmln = lines.get(r.nextInt(lines.size()));
            line1.setText("Line" + rdmln);

我希望能够在显示后从数组列表中删除 'rdmln'，这样它就不会再次显示.提前致谢.

I want to be able to remove 'rdmln' from the arraylist after it has been displayed so that it won't be displayed again. Thanks in advance.

推荐答案

检查 remove(int index) 函数.在你的情况下:

Check the remove(int index) function. In your case:

//your code
String rdmln = lines.remove(r.nextInt(lines.size()));
//the rest of your code

remove 会将其从列表中取出并返回给您使用.

remove will take it from the list and return it to you for use.

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