Java Decimal Round getRoundedValue(double value)

Description

Get rounded double value, according to the value of the double.

License

Apache License

Parameter

Parameter	Description
value	a parameter

Declaration

public static String getRoundedValue(double value) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.DecimalFormat;

public class Main {
    private static final String TWO_DECIMALS_FORMAT = "##.##";
    private static final String MAX_DECIMALS_FORMAT = "##.#####";
    private static final String DECIMALS_FORMAT_TOKEN = "#";

    /**/*from   w w w  . j a v a 2 s . c om*/
     * Get rounded double value, according to the value of the double.
     * Max rounding will be upto 4 decimals
     * For values gte 0.1, use ##.## (eg. 123, 2.5, 1.26, 0.5, 0.162)
     * For values lt 0.1 and gte 0.01, use ##.### (eg. 0.08, 0.071, 0.0123)
     * For values lt 0.01 and gte 0.001, use ##.#### (eg. 0.001, 0.00367)
     * This function ensures we don't prematurely round off double values to a fixed format, and make it 0.00 or lose out information
     * @param value
     * @return
     */
    public static String getRoundedValue(double value) {
        StringBuffer decimalFormatBuffer = new StringBuffer(
                TWO_DECIMALS_FORMAT);
        double compareValue = 0.1;
        while (value > 0
                && value < compareValue
                && !decimalFormatBuffer.toString().equals(
                        MAX_DECIMALS_FORMAT)) {
            decimalFormatBuffer.append(DECIMALS_FORMAT_TOKEN);
            compareValue = compareValue * 0.1;
        }
        DecimalFormat decimalFormat = new DecimalFormat(
                decimalFormatBuffer.toString());
        return decimalFormat.format(value);
    }
}

Related

1. getRoundedValue(double doubleValue)
2. round(double d, int n)
3. round(double d, int p)
4. round(double dValue)
5. round(double number)