java类的添加方法

Question

假设我有一个类似这样的Money类：

public class Money {
    private BigDecimal amount;
    private Currency currency;
}

我想把这两个类加在一起，例如

Money m1 = Money(5);
Money m2 = Money(10);
Money m3 = m1+m2; // m3.amount should be 15

我如何编写一个方法，以便将这两个Money类相加

Answer 1

Java不支持运算符重载，您需要添加一个add函数：

public class Money {
    private BigDecimal amount;
    private Currency currency;

    public Money add(Money m) {
        Money res = new Money();
        if (!currency.equals(m.currency)) {
            throw new UnsupportedOperationException();
        }
        res.currency = currency;
        res.amount = m.amount.add(amount);
        return res;
    }
}

Money result = one.add(two);