我正在为关于javaoop的作业编写代码。我不得不对2个分数做运算，但大多数时候输出是错误的，我不知道为什么。我认为simplify有问题，因为没有simplify的结果是正确的，如果两个分数0/8和6/14，减法应该是-3/7，但是输出是0/1，谢谢你的帮助！代码如下：

class Fraction {

          private int numer, denom;

          public Fraction(int numerator, int denominator) {
            numer = numerator;
            denom = denominator;
          }

          private int euclidGcd(int a, int b) {

            int remainder;
            while (b > 0) {
              remainder = a % b;
              a = b;
              b = remainder;
            }   
            return a;
          }

          private Fraction simplify() {

            int gcd = euclidGcd(numer, denom);
            this.numer = this.numer / gcd;
            this.denom = this.denom / gcd;

            Fraction result = new Fraction(numer, denom);  

            return result;  
          }

          public Fraction add(Fraction another) {

            int b = this.denom * another.denom;
            int a = (b/this.denom) * this.numer + (b/another.denom) * another.numer;
            Fraction result = new Fraction(a, b);  
            result.simplify();

            return result;  
          }

          public Fraction minus(Fraction another) {
            int b = this.denom * another.denom;
            int a = (b/this.denom) * this.numer - (b/another.denom) * another.numer;

            Fraction result = new Fraction(a, b);  // stub
            result.simplify();

            return result;  
          }

          public Fraction times(Fraction another) {
            int a = this.numer * another.numer;
            int b = this.denom * another.denom;

            Fraction result = new Fraction(a, b);  // stub
            result.simplify();

            return result;  
          }

          public Fraction divide(Fraction another) {
            int a = this.numer * another.denom;
            int b = this.denom * another.numer;
            Fraction result = new Fraction(a, b);  // stub

            result.simplify();
            return result;  
          }

          public String toString() {
            return numer + "/" + denom;  
          }