Random-随机生成电话号

package test1;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;


public class ranDomTest1 {
    public static void main(String[] args) throws  IOException{
//        test();
        test2();
    }

    public static void test2() throws IOException{
        FileWriter fw = new FileWriter("codeId189.txt");
        //创建一个缓存中，并发fw作为一个对象传入缓冲区中
        BufferedWriter bw = new BufferedWriter(fw);
        //9 代表循环9次，生成9个随机数
        for (int j=0;j<700;j++)
        {
            String number = "189";
            Random rd = new Random();
            for (int i=0;i<8;i++)//
            {
                //生成9为随机数
                number += rd.nextInt(9);
            }
            bw.write(number);
            bw.newLine();
            bw.flush();
//            System.out.println(number);
        }
        //刷新缓冲区
        bw.flush();
        //关闭缓冲区，其实就是关闭缓存流对下岗
        bw.close();
    }

    public static void test() {
        StringBuilder str =new StringBuilder("");
        Random random = new Random();
        for (int i=0;i<8;i++)
        {
            str.append(random.nextInt(10));
        }
        System.out.println("133"+str.toString());
    }
}