题解 | #整数与IP地址间的转换#

截取位数+转换字符串即可，没什么难度

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String s = in.next();
            long ipint = 0;
            String[] split = s.split("\\.");
            for (String value : split) {
                ipint <<= 8;
                ipint += Integer.parseInt(value);
            }
            System.out.println(ipint);

            long[] ip = new long[4];
            long n = in.nextLong();
            int bit = (1 << 8) - 1;
            for (int i = 0; i < 4; i++) {
                ip[3 - i] = (n & bit);
                n >>= 8;
            }
            for (int i = 0; i < 4; i++) {
                System.out.print(ip[i]);
                if (i != 3) {
                    System.out.print('.');
                }
            }

        }
    }
}