除去去年ArrayList的随机字符串 [英] Removing last random string from arraylist

问题描述

我正在做一个从文件显示的随机行的计划，但我有点新的ArrayList。我想它的显示后，但不能从文件从ArrayList中移除最previous随机线。这是因为我不希望它被重复做。这里是我的code：

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);

我希望能够从数组列表中删除'rdmln'后它已经被显示，使得它不会被再次显示。先谢谢了。

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

检查的 删除（INT指数） 功能。你的情况：

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

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

删除将它从列表中，并返回到您使用了。

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

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