Java Number Round roundString(double n, double range, double precision)

Description

round String

License

Open Source License

Declaration

public static String roundString(double n, double range, double precision) 

Method Source Code

//package com.java2s;
/*/*  w w w . ja  v  a 2  s.com*/
 * Copyright (c) Leuville Objects All Rights Reserved.
 *
 * Leuville Objects MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. Leuville Objects SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */

public class Main {
    private final static int[] coeffs = { 1, 10, 100, 1000, 10000, 100000, 1000000 };

    /**
     * Return a rounded double as a String.
     * @param  d  The initial double.
     * @param  nb  The number of decimal digits (between 0 and 6).
     */
    public static String roundString(double d, int nb) {
        d *= coeffs[nb];
        return Double.toString(Math.round(d) / coeffs[nb]);
    }

    public static String roundString(Number n, int nb) {
        return roundString(n.doubleValue(), nb);
    }

    public static String roundString(double n, double range, double precision) {
        double v = range * precision;
        int i = 0;
        while (v < 1) {
            v *= 10;
            i++;
        }
        return roundString(n, i);
    }

    public static String roundString(Number n, double range, double precision) {
        return roundString(n.doubleValue(), range, precision);
    }
}

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