Java新手如何制作简单投票系统

import java.util.*;
public class SimpleVotingSystem {
// 使用Map存储候选人及其票数
private static Map candidates = new HashMap<>();
private static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
    // 初始化候选人（可自定义）
    candidates.put("张三", 0);
    candidates.put("李四", 0);
    candidates.put("王五", 0);

    System.out.println("欢迎使用简易投票系统！");

    while (true) {
        showMenu();
        int choice = scanner.nextInt();
        scanner.nextLine(); // 消费换行符

        switch (choice) {
            case 1:
                vote();
                break;
            case 2:
                showResults();
                break;
            case 3:
                System.out.println("感谢使用，再见！");
                return;
            default:
                System.out.println("无效选择，请重新输入。");
        }
    }
}

// 显示菜单
private static void showMenu() {
    System.out.println("\n请选择操作：");
    System.out.println("1. 投票");
    System.out.println("2. 查看结果");
    System.out.println("3. 退出");
    System.out.print("请输入选项（1-3）：");
}

// 投票功能
private static void vote() {
    System.out.println("\n候选人列表：");
    List<String> candidateList = new ArrayList<>(candidates.keySet());
    for (int i = 0; i < candidateList.size(); i++) {
        System.out.println((i + 1) + ". " + candidateList.get(i));
    }

    System.out.print("请选择要投票的候选人编号：");
    int choice = scanner.nextInt();
    scanner.nextLine(); // 消费换行符

    if (choice > 0 && choice <= candidateList.size()) {
        String selected = candidateList.get(choice - 1);
        candidates.put(selected, candidates.get(selected) + 1);
        System.out.println("已成功为 " + selected + " 投票！");
    } else {
        System.out.println("无效编号，投票失败。");
    }
}

// 显示投票结果
private static void showResults() {
    System.out.println("\n当前投票结果：");
    for (Map.Entry<String, Integer> entry : candidates.entrySet()) {
        System.out.println(entry.getKey() + "：" + entry.getValue() + " 票");
    }
}
}