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  • 【Java】生成随机的*并输出到文件

    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.Random;
    import java.util.Scanner;
    
    public class Mobile {
        //中国移动
        public static final String[] CHINA_MOBILE = {
                "134", "135", "136", "137", "138", "139", "150", "151", "152", "157", "158", "159",
                "182", "183", "184", "187", "188", "178", "147", "172", "198"
        };
        //中国联通
        public static final String[] CHINA_UNICOM = {
                "130", "131", "132", "145", "155", "156", "166", "171", "175", "176", "185", "186", "166"
        };
        //中国电信
        public static final String[] CHINA_TELECOME = {
                "133", "149", "153", "173", "177", "180", "181", "189", "199"
        };
    
        /**
         * 生成手机号
         *
         * @param op 0 移动 1 联通 2 电信
         */
        public static String createMobile(int op) {
            StringBuilder sb = new StringBuilder();
            Random random = new Random();
            String mobile01;//手机号前三位
            int temp;
            switch (op) {
                case 0:
                    mobile01 = CHINA_MOBILE[random.nextInt(CHINA_MOBILE.length)];
                    break;
                case 1:
                    mobile01 = CHINA_UNICOM[random.nextInt(CHINA_UNICOM.length)];
                    break;
                case 2:
                    mobile01 = CHINA_TELECOME[random.nextInt(CHINA_TELECOME.length)];
                    break;
                default:
                    mobile01 = "op标志位有误!";
                    break;
            }
            if (mobile01.length() > 3) {
                return mobile01;
            }
            sb.append(mobile01);
            //生成手机号后8位
            for (int i = 0; i < 8; i++) {
                temp = random.nextInt(10);
                sb.append(temp);
            }
            return sb.toString();
        }
    
        public static void main(String[] args) throws IOException {
            Scanner scan = new Scanner(System.in);
            System.out.println("请输入生成的手机号个数:");
            int number = scan.nextInt();
            Random random = new Random();
            StringBuilder sb = new StringBuilder();
            for (int i = 1; i <= number; i++) {
                int op = random.nextInt(3);//随机运营商标志位
                sb.append(createMobile(op));
                if (i % 10 == 0) {
                    sb.append("
    ");
                } else {
                    sb.append("	");
                }
            }
            //写入文件
            FileOutputStream fos = new FileOutputStream(new File("F:/mobile.txt"));
            fos.write(sb.toString().getBytes());
            fos.close();
    
            System.out.println(number + "个号码生成成功!");
        }
    }
    
    
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  • 原文地址:https://www.cnblogs.com/ShadowFiend/p/11370780.html
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