如何在Java中将小数部分转换为二进制？

public static String decimalToBinary(double decimal) {
    String decimalString = String.valueOf(decimal);
    int index = decimalString.indexOf('.');
    if (index == -1) {
        return "0";
    }
    String fractionalPart = decimalString.substring(index + 1);
    double fractionalValue = Double.parseDouble("0." + fractionalPart);
    StringBuilder binaryFractional = new StringBuilder();
    while (fractionalValue > 0) {
        double product = fractionalValue * 2;
        if (product >= 1) {
            binaryFractional.append("1");
            fractionalValue = product - 1;
        } else {
            binaryFractional.append("0");
            fractionalValue = product;
        }
    }
    return binaryFractional.toString();
}