如何从数组中打印出一个随机字符串

Hi I was wondering how I can print out one random value of an array instead of two of them. Here is my code:

嗨，我想知道如何打印出一个数组的随机值而不是其中两个。这是我的代码：

public static void main(String args[])
{

    String[] currentRoom;
    String[][] rooms = new String [2] [2];
    rooms [0] [0] = "Start";
    rooms [0] [1] = "Treasure Room 1";
    rooms [1] [0] = "Goblin Hive 1";
    rooms [1] [1] = "Spider Nest";

    Random rand = new Random();
    {

        currentRoom = rooms[rand.nextInt(rooms.length)];

        System.out.println(Arrays.toString(currentRoom));

    }
}

When I print it out it will say two values from my array, something like: ["Start", "Treasure Room1"] and I need it to print out just one value like: ["Start"] or just ["Spider Nest1"]. I was wondering how I can solve this.

当我打印出来时，它会说出我的数组中的两个值，例如：[“Start”，“Treasure Room1”]，我需要它打印出一个值，如：[“Start”]或只是[“Spider Nest1” “。我想知道如何解决这个问题。

Any help is appreciated:)

任何帮助表示赞赏:)

2 个解决方案

#1

You need to generate a random index in the second dimension, like this:

您需要在第二维中生成随机索引，如下所示：

String[] currentRoomRow = rooms[rand.nextInt(rooms.length)];
String currentRoom = currentRoomRow[rand.nextInt(currentRoom.length)];
System.out.println(currentRoom);

This is OK when all rows have the same size; if they do not, the above code would "favor" items from "shorter" rows. Fixing this deficiency would require more preparation: you would need to "flatten" your array, generate a single random up to the number of items, and then pick an item from the flattened array.

当所有行具有相同的大小时，这是可以的;如果他们不这样做，上面的代码将“赞成”来自“较短”行的项目。修复此缺陷需要更多准备工作：您需要“展平”数组，生成单个随机数量的项目，然后从展平数组中选择一个项目。

#2

This is a two-dimensional array. By using only one index, you'll get an array (maybe with multiple values). By using rooms [0] you'll return ["Start", "Treasure Room1"].

这是一个二维数组。通过仅使用一个索引，您将获得一个数组（可能具有多个值）。通过使用房间[0]，您将返回[“开始”，“宝藏室1”]。

Thus you have to pass 2 indexes.

因此，您必须传递2个索引。

Dasblinkenlight's solution seems to be the best.

Dasblinkenlight的解决方案似乎是最好的。

#1