如何将小数转换为分数？

您应该找到结果数的最大公约数，然后除以分子和分母。

这是一种实现方法：

public class Rational {    private int num, denom;    public Rational(double d) {        String s = String.valueOf(d);        int digitsDec = s.length() - 1 - s.indexOf('.');        int denom = 1;        for (int i = 0; i < digitsDec; i++) { d *= 10;     denom *= 10;        }        int num = (int) Math.round(d);        int g = gcd(num, denom);        this.num = num / g;        this.denom = denom /g;    }    public Rational(int num, int denom) {        this.num = num;        this.denom = denom;    }    public String toString() {        return String.valueOf(num) + "/" + String.valueOf(denom);    }    public static int gcd(int num, int denom) {          ....    }    public static void main(String[] args) {        System.out.println(new Rational(1.5));    }}