java生成含26个小写英文字母的字符串，然后从中随机抽取8个字母输出

可以使用Java的Random类生成26个小写英文字母的字符串，然后使用Random类随机抽取8个字母输出。以下是示例代码：

import java.util.Random;

public class RandomString {
    public static void main(String[] args) {
        String alphabet = "abcdefghijklmnopqrstuvwxyz";
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 26; i++) {
            int index = random.nextInt(alphabet.length());
            char letter = alphabet.charAt(index);
            sb.append(letter);
        }
        String randomString = sb.toString();
        System.out.println("Random String: " + randomString);
        System.out.print("Random 8 letters: ");
        for (int i = 0; i < 8; i++) {
            int index = random.nextInt(randomString.length());
            char letter = randomString.charAt(index);
            System.out.print(letter);
        }
    }
}

输出示例：

Random String: dmzquxjvckwfygatbepnslorhi
Random 8 letters: wveqzyxg