java - 随机数 - 增加/减少 1

Question

我正在研究一种方法，该方法采用 3 和 -3 之间的步骤。我的程序不会按数字顺序打印出步骤，我不太清楚该怎么做，而且我在其他地方找不到任何东西。

public static final int SENTINEL = Math.abs(3); 
public static void randomWalk(Random rand) {
    int walk = 0;
    while (walk != SENTINEL) {
        walk = (rand.nextInt((3 - (-3)) + 1) - 3);
        System.out.println("Position = " + walk);
    }
}

Answer 1

如果这就是您正在寻找的:

int walk = 0;
int randomStep = 0;
Random rand = new Random();
while (Math.abs(walk) != 3) {
    randomStep = rand.nextInt(2) > 0 ? 1 : -1; // -1 or 1 with 50% probability
    walk += randomStep;
    System.out.print(walk + " ");
}
//sample output: -1 -2 -1 0 1 2 1 2 3