如果是输入一个主网IP网段和子网掩码，如何获取其随机的子网

以下是Java获取指定主网IP网段和子网掩码的随机子网段的代码示例：

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Random;

public class RandomSubnet {
    public static void main(String[] args) {
        try {
            // 指定主网IP网段和子网掩码
            String networkAddress = "192.168.1.0";
            int subnetMask = 24;

            // 将主网IP地址转换为字节数组
            byte[] ipBytes = InetAddress.getByName(networkAddress).getAddress();

            // 计算子网掩码对应的子网地址
            int mask = 0xffffffff << (32 - subnetMask);
            byte[] maskBytes = new byte[] { (byte) (mask >>> 24), (byte) (mask >> 16 & 0xff), (byte) (mask >> 8 & 0xff), (byte) (mask & 0xff) };
            byte[] subnetBytes = new byte[] { (byte) (ipBytes[0] & maskBytes[0]), (byte) (ipBytes[1] & maskBytes[1]), (byte) (ipBytes[2] & maskBytes[2]), 0 };

            // 随机生成子网地址的最后一个字节
            Random random = new Random();
            byte[] randomBytes = new byte[] { (byte) random.nextInt(256) };

            // 合并主网地址和随机字节，得到随机生成的子网段地址
            byte[] addressBytes = new byte[] { subnetBytes[0], subnetBytes[1], subnetBytes[2], randomBytes[0] };
            Inet4Address subnet = (Inet4Address) InetAddress.getByAddress(addressBytes);

            // 输出随机生成的子网段地址
            System.out.println("主网地址: " + networkAddress);
            System.out.println("子网掩码: " + subnetMask);
            System.out.println("子网段地址: " + subnet.getHostAddress());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

该程序首先根据指定的主网IP地址和子网掩码计算出对应的子网段地址，然后通过随机生成子网地址的最后一个字节的方式得到随机生成的子网段地址，并输出结果。