写一个Java程序实现三门问题

好的，以下是一个 Java 程序实现三门问题的例子：

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

public class ThreeDoorsProblem {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Random random = new Random();
        int carPosition = random.nextInt(3); // 随机生成汽车所在的门的位置（0-2）
        int choice = -1; // 参赛者选择的门的位置
        int openedDoor = -1; // 主持人打开的门的位置
        int switchChoice = -1; // 参赛者决定是否换门后的选择

        System.out.println("Welcome to the three doors problem!");
        System.out.println("There is a car behind one of three doors.");
        System.out.println("You need to choose one door to open.");
        System.out.print("Please enter your choice (0-2): ");
        choice = scanner.nextInt();

        // 主持人打开一个空门（非汽车门且非参赛者选择的门）
        do {
            openedDoor = random.nextInt(3);
        } while (openedDoor == carPosition || openedDoor == choice);

        System.out.println("The host opened door " + openedDoor + ", and it's empty.");
        System.out.print("Do you want to switch your choice? (0 for no, 1 for yes): ");
        switchChoice = scanner.nextInt();

        if (switchChoice == 1) {
            // 参赛者换门
            int newChoice = -1;
            do {
                newChoice = random.nextInt(3);
            } while (newChoice == choice || newChoice == openedDoor);
            choice = newChoice;
        }

        if (choice == carPosition) {
            System.out.println("Congratulations! You win the car!");
        } else {
            System.out.println("Sorry, you lose.");
        }
    }
}

这个程序通过随机生成汽车所在的门的位置，和参赛者选择的门的位置，以及主持人打开的门的位置，来模拟三门问题的过程。参赛者可以选择是否换门，最后根据选择的门是否是汽车所在的门来判断是否获胜。