Rank.java

public enum Rank {
	FIRST(6, false, 2000000000),
	SECOND(5, true,  30000000),
	THIRD(5, false, 1500000),
	FOURTH(4, false, 50000),
	FIFTH(3, false, 5000),
	MISS(0, false, 0);

	private static final int WINNING_MIN_COUNT = 3;

	private int countOfMatch;
	private boolean isBonusMatch;
	private int prizeMoney;

	Rank(final int countOfMatch, final boolean isBonusMatch, final int prizeMoney) {
		this.countOfMatch = countOfMatch;
		this.isBonusMatch = isBonusMatch;
		this.prizeMoney = prizeMoney;
	}

	public static Rank valueOf(final int countOfMatch, final boolean isBonusMatch) {
		if (countOfMatch < WINNING_MIN_COUNT) {
			return MISS;
		}

		for (final Rank rank : Rank.values()) {
			if (rank.countOfMatch == countOfMatch && rank.isBonusMatch == isBonusMatch) {
				return rank;
			}
		}

		throw new IllegalArgumentException(countOfMatch + "는 유효하지 않은 값입니다.");
	}

	public int getPrizeMoney() {
		return prizeMoney;
	}

	@Override
	public String toString() {
		if (this.equals(SECOND)) return String.format("%d개 일치, 보너스 볼 일치 (%d원)", countOfMatch, prizeMoney);
		return String.format("%d개 일치 (%d원)", countOfMatch, prizeMoney);
	}
}