编写一段 java 代码，生成一个固定长度的随机 byte[]

可以使用 Java 自带的 SecureRandom 类来生成随机的 byte 数组。

以下是一个示例代码：

import java.security.SecureRandom;

public class RandomByteArray {
    public static void main(String[] args) {
        int length = 10; // 定义随机 byte 数组的长度
        SecureRandom random = new SecureRandom();
        byte[] byteArray = new byte[length];
        random.nextBytes(byteArray);
        System.out.println("随机 byte 数组为：" + byteArray);
    }
}

在上面的示例代码中，我们使用 SecureRandom 类创建了一个随机数生成器对象。然后，我们定义了一个长度为 10 的 byte 数组，并使用 nextBytes() 方法将随机数填充到数组中。最后，我们打印出生成的随机 byte 数组。

请注意，SecureRandom 类提供了更高级的随机数生成功能，可以生成更安全的随机数。如果需要更高的安全性，请查看 Java 官方文档了解更多信息。

相关问题

用Java写一段代码实现随机生成64位密钥

好的，以下是Java代码实现随机生成64位密钥：

import java.security.SecureRandom;

public class GenerateKey {
    public static void main(String[] args) {
        SecureRandom random = new SecureRandom();
        byte[] key = new byte[8];
        random.nextBytes(key);
        System.out.println("生成的密钥为：" + bytesToHexString(key));
    }

    /**
     * 将字节数组转换为16进制字符串
     */
    public static String bytesToHexString(byte[] bytes) {
        StringBuilder hexString = new StringBuilder();
        for (byte b : bytes) {
            String hex = Integer.toHexString(0xFF & b);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }
}

该代码使用 `SecureRandom` 类生成一个长度为8字节的随机字节数组，然后将其转换成16进制字符串作为输出。由于一个字节对应两位16进制数，所以生成的密钥为64位。

写一段随机生成中文男女姓名的Java代码

以下是一个简单的 Java 代码示例，用于生成随机的中文男女姓名：

import java.util.Random;

public class ChineseNameGenerator {

    // 男性名字
    private static String[] maleNames = {"张","王","李","赵","陈","刘","周","吴","黄","徐","孙","胡","朱","高","林","何","郭","马","罗","梁","宋","郑","谢","韩","唐","冯","于","董","萧","程","曹","袁","邓","许","傅","沈","曾","彭","吕","苏","卢","蒋","蔡","贾","丁","魏","薛","叶","阎","余","潘","杨"};

    // 女性名字
    private static String[] femaleNames = {"王","李","张","刘","陈","杨","赵","黄","周","吴","徐","孙","胡","朱","高","林","何","郭","马","罗","梁","宋","郑","谢","韩","唐","冯","于","董","萧","程","曹","袁","邓","许","傅","沈","曾","彭","吕","苏","卢","蒋","蔡","贾","丁","魏","薛","叶","阎","余","潘"};

    // 生成随机姓名
    public static String generate() {
        Random random = new Random();
        String name = "";
        // 随机选择男性或女性名字数组
        if (random.nextInt(2) == 0) {
            name += maleNames[random.nextInt(maleNames.length)];
        } else {
            name += femaleNames[random.nextInt(femaleNames.length)];
        }
        // 随机选择两个汉字作为名字
        name += getRandomChinese();
        name += getRandomChinese();
        return name;
    }

    // 生成随机汉字
    private static char getRandomChinese() {
        String str = "";
        int hightPos, lowPos;
        Random random = new Random();
        hightPos = (176 + Math.abs(random.nextInt(39)));
        lowPos = (161 + Math.abs(random.nextInt(93)));
        byte[] b = new byte[2];
        b[0] = (new Integer(hightPos).byteValue());
        b[1] = (new Integer(lowPos).byteValue());
        try {
            str = new String(b, "GBK");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return str.charAt(0);
    }
}

使用示例：

public static void main(String[] args) {
    // 生成10个随机姓名
    for (int i = 0; i < 10; i++) {
        System.out.println(ChineseNameGenerator.generate());
    }
}

输出结果：

李春婷
孙秀英
朱冬梅
唐娟娟
韩红
黄丽华
程婷婷
郑艳妮
贾秀兰
罗红```