Java程序生成有限制的随机数
为了生成具有限制的随机数，我们在这里以印度的国家/地区代码为91的号码为例。
首先，我们设置了前两个数字，即国家/地区代码。为每个数字声明变量。我们还将国家/地区代码91后的数字的第一位固定为9：
Random num = new Random(); int num0, num1, num2, num3, num4, num5, num6, num7, num8, num9, num10, num11; num0 = 9; num1 = 1; num2 = 9;
现在，对于其余数字，请使用nextInt()随机数的。该参数由随机数的边界集组成：
num3 = num.nextInt(9) + 10; num4 = num.nextInt(10); num5 = num.nextInt(5) + 11; num6 = num.nextInt(10); num7 = num.nextInt(3); num8 = num.nextInt(5); num9 = num.nextInt(10);
示例
import java.util.Random;
public class Main {
public static void main(String[] args) {
Random num = new Random();
int num0, num1, num2, num3, num4, num5, num6, num7, num8, num9, num10, num11;
num0 = 9;
num1 = 1;
num2 = 9;
num3 = num.nextInt(9) + 10;
num4 = num.nextInt(10);
num5 = num.nextInt(5) + 11;
num6 = num.nextInt(10);
num7 = num.nextInt(3);
num8 = num.nextInt(5);
num9 = num.nextInt(10);
System.out.print("Random (Country code 91 for India) = ");
System.out.print(num0);
System.out.print(num1);
System.out.print("-" + num2);
System.out.print(num3);
System.out.print(num4);
System.out.print(num5);
System.out.print(num6);
System.out.print(num7);
System.out.print(num8);
System.out.print(num9);
}
}输出结果
Random (Country code 91 for India) = 91-9114158010