在 Java 中使用随机类的简单投币。do while 循环似乎不会产生随机结果

Question

每次运行 main 中的 do-while 循环时，我都会遇到生成随机数的问题。当我删除 do - while 语句时，if 语句工作正常，似乎每次都会生成一个随机结果，但是当它在循环中重复时，它似乎只是重复了初始结果。

这是我的代码：

import java.util.Random;

public class CoinToss {
    private enum Coin {Heads, Tails};

    Random randomNum = new Random();
    private int result = randomNum.nextInt(2);
    private int heads = 0;
    private int tails = 1;
    Coin coinFlip;

    public void flip() {
        if (result == 0) {
            coinFlip = Coin.Heads;
            System.out.println("You flipped Heads!");
        } else {
            coinFlip = Coin.Tails;
            System.out.println("You flipped Tails!");
        }
    }
}

我的方法主要在我似乎遇到问题的地方：

import java.util.Scanner;

public class TossGame {
    public static void main(String[] args) {
        CoinToss test = new CoinToss();
        int choice;

        System.out.println("Welcome to the coin toss game!");
        do {
            System.out.print("Enter 1 to toss coin or enter 0 to quit: ");
            Scanner input = new Scanner(System.in);
            choice = input.nextInt();

            if (choice == 1) {
                test.flip();
            } else if (choice > 1) {
                System.out.println("Invalid entry - please enter 1 or 0: ");
                choice = input.nextInt();
            }
        } while (choice != 0);
    }
}

Answer 1

您需要将结果放在flip()方法中，因此每次调用都会随机化。

private int result;
private int heads = 0;
private int tails = 1;
Coin coinFlip;

public void flip(){
    result = randomNum.nextInt(2)
    if(result == 0){
        coinFlip = Coin.Heads;
        System.out.println("You flipped Heads!");
    }else{
        coinFlip = Coin.Tails;
        System.out.println("You flipped Tails!");
    }
  }
}