JAVA，面向对象写一个投票程序

以下是一个基本的投票程序：

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class VoteProgram {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Map<String, Candidate> candidates = new HashMap<>();
        int numCandidates = 0;
        System.out.println("Welcome to the voting program!");
        System.out.print("Enter the number of candidates: ");
        numCandidates = scanner.nextInt();
        scanner.nextLine(); // consume the newline character
        for (int i = 1; i <= numCandidates; i++) {
            System.out.print("Enter the name of candidate #" + i + ": ");
            String name = scanner.nextLine();
            candidates.put(name, new Candidate(name));
        }
        while (true) {
            System.out.println("Please select an option:");
            System.out.println("1. Vote");
            System.out.println("2. View Results");
            System.out.println("3. Exit");
            int choice = scanner.nextInt();
            scanner.nextLine(); // consume the newline character
            if (choice == 1) {
                System.out.print("Enter the name of the candidate you want to vote for: ");
                String candidateName = scanner.nextLine();
                Candidate candidate = candidates.get(candidateName);
                if (candidate == null) {
                    System.out.println("Invalid candidate name.");
                } else {
                    candidate.addVote();
                    System.out.println("You have successfully voted for " + candidate.getName() + ".");
                }
            } else if (choice == 2) {
                System.out.println("Current vote count:");
                for (Candidate candidate : candidates.values()) {
                    System.out.println(candidate.getName() + ": " + candidate.getVoteCount());
                }
            } else if (choice == 3) {
                System.out.println("Thank you for using the voting program!");
                break;
            } else {
                System.out.println("Invalid choice.");
            }
        }
    }
}

class Candidate {
    private String name;
    private int voteCount;

    public Candidate(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public int getVoteCount() {
        return voteCount;
    }

    public void addVote() {
        voteCount++;
    }
}

这个程序使用了一个 `Map` 来存储候选人的信息，其中每个候选人都对应一个 `Candidate` 对象。`Candidate` 类包含了候选人的姓名和票数，以及相关的 getter 和 setter 方法。程序的主要逻辑是一个循环，其中用户可以选择投票、查看结果或退出程序。在投票过程中，程序会验证用户输入的候选人姓名是否有效，并更新对应候选人的票数。在查看结果时，程序会遍历 `Map` 中的所有候选人，并输出他们的姓名和票数。