2.2 随机生成一个n bit位的整数

import java.util.Random;import java.util.Scanner;public class create {public static void main(String[] args) {// TODO Auto-generated method stubSystem.out.print("请输入n的值：");Scanner scanner = new Scanner(System.in);int n = scanner.nextInt();System.out.print(createRndInteger(n));}static long createRndInteger(int n){int min =  (int) Math.pow(2, n-1);Random random = new Random();int p = random.nextInt(min) + min;return p;}}

结果：

     

思想：一个n bit位的数值范围为：[2^（n-1）,2^n - 1]；random.nextInt(min) + min生成随机数在[2^（n-1）,2^n - 1]区间内