⽣成三个字符串类型的数组，第⼀个数组中⼿动存⼊代表名字的字符串10个，第⼆个数 组存⼊代表地点的字符串15个，第三个数组存⼊代表⾏为的字符串12个，使⽤⽣成随 机数的⽅法Math.random()来随机拼接句⼦。

好的，根据您的要求，我可以提供以下代码示例：

public class RandomSentenceGenerator {
    public static void main(String[] args) {
        String[] names = {"Alice", "Bob", "Charlie", "David", "Eve", "Frank", "Grace", "Henry", "Ivy", "John"};
        String[] places = {"beach", "forest", "mountain", "city", "park", "river", "desert", "island", "cave", "valley", "ocean", "lake", "castle", "temple", "space"};
        String[] actions = {"ran", "jumped", "climbed", "swam", "flew", "slept", "laughed", "sang", "danced", "ate", "drank", "read"};

        int numSentences = 5;

        for (int i = 0; i < numSentences; i++) {
            String name = names[(int) (Math.random() * names.length)];
            String place = places[(int) (Math.random() * places.length)];
            String action = actions[(int) (Math.random() * actions.length)];

            String sentence = name + " " + action + " at the " + place + ".";
            System.out.println(sentence);
        }
    }
}

这个程序会随机从名字、地点和行为的数组中选择一个元素，然后拼接成一个句子。程序会生成5个这样的句子，并输出到控制台上。您可以根据需要修改数组的大小和生成的句子数量。