Java Double to String doubleToString(double inValue, int precision, boolean useComma)

Description

double To String

License

Apache License

Declaration

public static String doubleToString(double inValue, int precision,
            boolean useComma) 

Method Source Code

//package com.java2s;
/*/*w  w  w.  j a  v  a2 s .  c  o m*/
 * Copyright 2010 the original author or authors.
 * Copyright 2010 SorcerSoft.org.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    public static String doubleToString(double inValue, int precision) {
        return doubleToString(inValue, precision, false);
    }

    public static String doubleToString(double inValue, int precision,
            boolean useComma) {
        boolean trailingZero;
        double absval = Math.abs(inValue); // get positive portion
        if (precision < 0) {
            precision = -precision;
            trailingZero = false;
        } else
            trailingZero = true;
        String signStr = "";
        if (inValue < 0)
            signStr = "-";
        long intDigit = (long) Math.floor(absval); // get integer part
        String intDigitStr = String.valueOf(intDigit);

        if (useComma) {
            int intDigitStrLen = intDigitStr.length();
            int digIndex = (intDigitStrLen - 1) % 3;
            digIndex++;
            String intCommaDigitStr = intDigitStr.substring(0, digIndex);
            while (digIndex < intDigitStrLen) {
                intCommaDigitStr += ","
                        + intDigitStr.substring(digIndex, digIndex + 3);
                digIndex += 3;
            }
            intDigitStr = intCommaDigitStr;
        }

        String precDigitStr = "";
        long precDigit = Math.round((absval - intDigit)
                * Math.pow(10.0, precision));
        precDigitStr = String.valueOf(precDigit);

        // pad zeros between decimal and precision digits
        String zeroFilling = "";
        for (int i = 0; i < precision - precDigitStr.length(); i++)
            zeroFilling += "0";
        precDigitStr = zeroFilling + precDigitStr;
        if (!trailingZero) {
            int lastZero;
            for (lastZero = precDigitStr.length() - 1; lastZero >= 0; lastZero--)
                if (precDigitStr.charAt(lastZero) != '0')
                    break;
            precDigitStr = precDigitStr.substring(0, lastZero + 1);
        }
        if (precDigitStr.equals(""))
            return signStr + intDigitStr;
        else
            return signStr + intDigitStr + "." + precDigitStr;
    }
}

Related

1. doubleToString(double d)
2. doubleToString(double d)
3. doubleToString(double d, int fNumber)
4. doubleToString(double d, int sigDigs)
5. doubleToString(Double doub)
6. doubleToString(double val)
7. doubleToString(double val, int digits)
8. doubleToString(double value, int afterDecimalPoint)
9. doubleToString(double value, int afterDecimalPoint)