用java写voting

以下是一个简单的使用Java实现投票的示例程序：

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

public class VotingSystem {
    public static void main(String[] args) {
        Map<String, Integer> candidates = new HashMap<String, Integer>();
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of candidates: ");
        int numCandidates = scanner.nextInt();
        scanner.nextLine(); // consume the newline character left by nextInt()
        for (int i = 1; i <= numCandidates; i++) {
            System.out.print("Enter the name of candidate " + i + ": ");
            String name = scanner.nextLine();
            candidates.put(name, 0);
        }
        while (true) {
            System.out.print("Enter your vote (or 'done' to finish voting): ");
            String vote = scanner.nextLine();
            if (vote.equals("done")) {
                break;
            }
            if (!candidates.containsKey(vote)) {
                System.out.println("Invalid vote.");
            } else {
                candidates.put(vote, candidates.get(vote) + 1);
            }
        }
        int maxVotes = 0;
        String winner = "";
        for (String candidate : candidates.keySet()) {
            int votes = candidates.get(candidate);
            if (votes > maxVotes) {
                maxVotes = votes;
                winner = candidate;
            }
            System.out.println(candidate + ": " + votes + " votes");
        }
        System.out.println("Winner: " + winner);
    }
}

此程序首先要求输入候选人的数量和姓名，然后要求逐个输入投票，直到输入“done”为止。程序会在每次投票后更新每个候选人的票数，并在投票结束后输出每个候选人的票数和最终获胜者的姓名。

请注意，此程序仅用于演示目的，并不具备安全性和可扩展性。在实际应用中，需要考虑更多的因素，例如选民身份验证、防止重复投票等。