字符串的分数，转成分子分母相除的小数

字符串的分数，转成分子分母相除的小数

String attribute3 = "1/4";
if (attribute3 != null && attribute3.length() > 0) {
            int index = attribute3.indexOf('/');
            double x1 = Double.parseDouble(attribute3.substring(0,
                    index));
            double x2 = Double.parseDouble(attribute3
                    .substring(index + 1));
            System.out.println(x1 / x2);
            double toBeString = x1 / x2;
            String valueOf = String.valueOf(toBeString);
            attribute3 = valueOf;
        }