java - 从数组中获取随机值

Question

我有一个可以生成事实的简单应用程序。我想合并一个生成随机事实而不是递增或递减的函数。

我的数组看起来像这样。

public class Facts {
    String facts[] = {
        "Elephants are the only mammals that can't jump.",
        "Candles will burn longer and drip less if they are placed in the freezer a few hours before using.",
        "Potatoes have more chromosomes than humans.",
        "You burn more calories sleeping than you do watching television.",
        "Animals that lay eggs don't have belly buttons.",
    };

String factNumber[] = {
    "Fact 1",
    "Fact 2",
    "Fact 3",
    "Fact 4",
    "Fact 5",
};

public String randomButton() {

    Random r = new Random();
    return facts[i]
}

Answer 1

简单!方法 nextInt(facts.length) 返回 0 到数组长度之间的随机整数。将其作为数组的索引即可获取随机数:

Random rnd = new Random()
String randomFact = facts[rnd.nextInt(facts.length)];