定义钱类，包括元角分信息，提供构造方法、钱加减方法、钱翻倍方法、钱比较大小的方法、格式化显示钱的方法。

定义一个表示钱的类，通常命名为`Money`，可以按照以下方式设计：

public class Money {
    private int yuan; // 元
    private int jiao; // 角
    private int fen; // 分

    // 构造方法
    public Money(int yuan, int jiao, int fen) {
        this.yuan = yuan;
        this.jiao = Math.min(100, jiao); // 角数限制在0-100之间
        this.fen = Math.min(1000, fen); // 分数限制在0-1000之间
    }

    // 钱加减方法
    public Money add(Money other) {
        int totalYuan = this.yuan + other.yuan;
        int totalJiao = this.jiao + other.jiao;
        int totalFen = this.fen + other.fen;

        return new Money(totalYuan, totalJiao, totalFen);
    }

    public Money subtract(Money other) {
        if (this.value() >= other.value()) {
            int differenceYuan = this.yuan - other.yuan;
            int differenceFen = this.fen - other.fen;
            return new Money(differenceYuan, differenceJiaoFromFen(differenceFen), 0);
        } else {
            throw new IllegalArgumentException("不能从更小的钱中减去更多");
        }
    }

    // 钱翻倍方法
    public Money doubleValue() {
        return new Money(this.yuan * 2, this.jiao * 2, this.fen * 2);
    }

    // 比较大小的方法
    @Override
    public boolean equals(Object obj) {
        if (obj instanceof Money) {
            Money other = (Money) obj;
            return this.yuan == other.yuan && this.jiao == other.jiao && this.fen == other.fen;
        }
        return false;
    }

    @Override
    public int compareTo(Money other) {
        int yuanDiff = this.yuan - other.yuan;
        if (yuanDiff != 0) return yuanDiff;
        return Integer.compare(this.jiao + this.fen / 10, other.jiao + other.fen / 10);
    }

    // 格式化显示钱的方法
    @Override
    public String toString() {
        return String.format("%d元%d角%d分", yuan, jiao, fen);
    }

    // 私有方法转换角和分
    private int differenceJiaoFromFen(int differenceFen) {
        differenceFen %= 100; // 取余得到角数
        return Math.max(0, differenceFen / 10); // 向上取整到角
    }

    // 返回总值用于判断是否能减法运算
    private int value() {
        return yuan * 100 + jiao * 10 + fen;
    }
}