Java - 自己的Object的隐式类型转换

Question

我用这样的构造函数编写了一个自己的分数类：

class Rational {
    //A Class representing Rationals
    long numerator ;
    long denominator;
    Rational (long numerator , long denominator) {
        this.numerator = numerator ;
        this.denominator = denominator;
        if (this.denominator < 0) {
            this.numerator *= (-1);
            this.denominator *= (-1);
        }
    }

    Rational (Rational rational) {
        this.numerator = rational.numerator ;
        this.denominator = rational.denominator;
        if (this.denominator < 0) {
            this.numerator *= (-1);
            this.denominator *= (-1);
        }
    }
}

现在我想（例如）将一个分数乘以整数。有没有办法从整数到小数进行隐含的类型转换，以便分子等于给定的整数，分母设置为1.

例如：

Rational rationalOne = new Rational (1L, 2L); //this represents the fraction 1/2
rationalOne.add(2);                           //add takes a rational as an argument

这个想法是，它从2到2/1被隐式铸造。

感谢您的帮助