创建随机电话号码

创建一个随机的电话号码，前面是5到8位数，后面有随机的区号3到5位数，可能有区号也可能没有。

代码如下

package Test1;

import java.util.Random;

public class number {
    public static void main(String[] args) {
        Random r = new Random();
        //左边的电话为3到5位数
        int liftNumber = r.nextInt(4)+5;

        //右边的电话为5到8位数
        int rightNumber = r.nextInt(3)+3;

        //定义一个随机数来判断电话是否有区号
        int judgeNumber = r.nextInt(2);
        String Number = "";
        for (int i = 0; i < liftNumber; i++) {
            //公用的数
            int nuber = r.nextInt(10);
            Number =Number + nuber;
        }
        if(judgeNumber == 1){
            Number = Number + "-";
            for (int i = 0; i < rightNumber; i++) {
                int nuber = r.nextInt(10);
                Number =Number + nuber;
            }
        }
        System.out.println(Number);
    }
}

结果截图