Test6.java

/*
 * 김소은
 * 과제6. 가상 대선 당선 시뮬레이션 프로그램
 *
 * 대선과 관련된 상수, 변수, 함수를 묶어 PresidentialElection 클래스를 만들었습니다.
 * PresidentialElection 클래스의 내부 클래스로 후보자와 관련된 변수, 함수를 담는 Candidate 클래스를 만들었습니다.
 */

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

class PresidentialElection {
	private static final int TOTAL_VOTES = 10000;

	private final List<Candidate> candidates;
	private int currentVotes;

	PresidentialElection() {
		candidates = new ArrayList<>();
		candidates.add(new Candidate("이재명", 1));
		candidates.add(new Candidate("윤석열", 2));
		candidates.add(new Candidate("심상정", 3));
		candidates.add(new Candidate("안철수", 4));
	}와

	public void elect() {
		for (currentVotes = 1; currentVotes <= TOTAL_VOTES; currentVotes++) {
			int votedIdx = voteRandom();
			Candidate votedCandidate = candidates.get(votedIdx);
			votedCandidate.vote();

			printVotingProgress(votedCandidate);
			printVotingProgressByCandidate();
		}
		printElectionResult();
	}

	private int voteRandom() {
		return new Random().nextInt(candidates.size());
	}

	private void printVotingProgress(Candidate votedCandidate) {
		float votingPercentage = (float) currentVotes / TOTAL_VOTES * 100;
		System.out.printf("[투표진행율]: %.2f%%, %d명 투표 => %s\n", votingPercentage, currentVotes, votedCandidate.getName());
	}

	private void printVotingProgressByCandidate() {
		for (int i = 0; i < candidates.size(); i++) {
			Candidate candidate = candidates.get(i);
			float votingPercentageByCandidate = (float) candidate.getVotes() / currentVotes * 100;
			System.out.printf("[기호:%d] %s: %05.2f%%, (투표수: %d)\n", candidate.getNumber(), candidate.getName(), votingPercentageByCandidate, candidate.getVotes());
		}
	}

	private void printElectionResult() {
		Collections.sort(candidates);
		Candidate first = candidates.get(0);
		Candidate second = candidates.get(1);
		
		if (first.getVotes() != second.getVotes()) {
			System.out.printf("[투표결과] 당선인: %s\n", first.getName());
		} else {
			System.out.println("동률이므로 당선자가 없습니다.");
		}
	}

	class Candidate implements Comparable<Candidate> {
		private final String name;
		private final int number;
		private int votes;

		Candidate(String name, int number) {
			this.name = name;
			this.number = number;
			this.votes = 0;
		}

		public String getName() {
			return name;
		}

		public int getNumber() {
			return number;
		}

		public int getVotes() {
			return votes;
		}

		public void vote() {
			votes++;
		}

		@Override
		public int compareTo(Candidate o) {
			return Integer.compare(o.votes, this.votes);	// 투표 수 내림차순
		}
	}
}

public class Test6 {
	public static void main(String[] args) {
		PresidentialElection presidentialElection = new PresidentialElection();
		presidentialElection.elect();
	}
}