Question

你好我是java的初学者，我在随机化一组字符串时遇到了问题（5）。如果你看看“可爱”循环，我可以随机化列表，但它只输出数字1 - 5而不是输出我想要的字符串。我在这里做错了什么？

基本上，我想要的是让用户键入他们想要观看的视频类型，然后让节目从他们选择5个视频的类别中随机化并从中选择一个并输出给用户

if(userString.equalsIgnoreCase("cute")){

    int cutelist = rand.nextInt(5);

    if (cutelist == 0) {
        String cute1 = "https://www.youtube.com/watch?v=EdCVijVT7Wk";
    } else if (cutelist == 1) {
        String cute2 = "http://youtu.be/-XCvPptsfhI?t=7s";
    } else if (cutelist == 2) {
        String cute3 = "https://www.youtube.com/watch?v=-nkEPsSsH68";
    } else if (cutelist == 3) {
        String cute4 = "https://www.youtube.com/watch?v=FZ-bJFVJ2P0";
    } else {
        String cute5 = "https://www.youtube.com/watch?v=argCvDpk_KQ";
    }

    String cute1 = "https://www.youtube.com/watch?v=EdCVijVT7Wk";
    String cute2 = "http://youtu.be/-XCvPptsfhI?t=7s";
    String cute3 = "https://www.youtube.com/watch?v=-nkEPsSsH68";
    String cute4= "https://www.youtube.com/watch?v=FZ-bJFVJ2P0";
    String cute5 = "https://www.youtube.com/watch?v=argCvDpk_KQ";

    System.out.println("Here's a funny you can watch:" + cutelist);

}

Answer 1

您打印出随机数。

int cutelist = rand.nextInt(5);

...

System.out.println("Here's a funny you can watch:" + cutelist);

如果您要打印出一个字符串值（cute1，cute2等），则应将它们放入数组或ArrayList并使用cutelist变量作为索引。

你想要的东西是：

int index = rand.nextInt(5);
String[] videos = new String[5];

videos[0] = "https://www.youtube.com/watch?v=EdCVijVT7Wk";
videos[1] = "http://youtu.be/-XCvPptsfhI?t=7s";
videos[2] = "https://www.youtube.com/watch?v=-nkEPsSsH68";
videos[3] = "https://www.youtube.com/watch?v=FZ-bJFVJ2P0";
videos[4] = "https://www.youtube.com/watch?v=argCvDpk_KQ";

System.out.println("Here's a funny you can watch:" + videos[index]);

有关详细信息，请参阅Java Tutorial on Arrays。请务必注意，除了上图所示之外，还有其他方法可以初始化数组。

如何随机化一组字符串？

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