Question

对不起基本问题，但我是Java的新手。

每次在main中执行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语句工作正常并且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!");
    }


}

}

我的方法主要是我似乎遇到问题：

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);




}

}

提前感谢您的建议！

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!");
    }
  }
}

Answer 2

你只是＆＃34;翻转＆＃34;一次，当您初始化result时：

private int result = randomNum.nextInt(2);

当您致电flip时，请获取其他结果：

public void flip(){
    result = randomNum.nextInt(2);  // Add this line
    if(result == 0){

Answer 3

每次调用flip（）时都需要随机化一个翻转，而不是在构造CoinToss时：

public class CoinToss {

private enum Coin{Heads, Tails};

Random randomNum = new Random();
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!");
    }
}

简单的硬币折腾使用Java中的随机类。 do while循环似乎不会生成随机结果

3 个答案: