java - Java 中的随机类型对象总是给我相同的数字

Question

如何在Java中每次获取不同的随机数:

import java.util.Random;
import java.util.Scanner;

public class Guess_tutorial {
    public static void main(String[] args) {

        Random random = new Random(100);
        int rand_num = random.nextInt(100);

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter your number: ");
        int n = sc.nextInt();

        while (n != rand_num) {

            if (n > rand_num) {
                System.out.println("Too high!");
            } else {
                System.out.println("Too low!");
            }

            n = sc.nextInt();
        }
        sc.close();
        System.out.println("That's right!");
    }
}

总是 15。我做错了什么？努力学习 Java。

Answer 1

您正在将常量种子传递给 Random 构造函数。不要那样做。它将默认为从时间派生的种子。变化

Random random = new Random(100);

到

Random random = new Random();