Java Formatter Usage getRoundedString(double value, int powerOf10)

Description

get Rounded String

License

Open Source License

Declaration

public static String getRoundedString(double value, int powerOf10) 

Method Source Code

//package com.java2s;
/*//from   w  w  w . j a va  2s  . co m
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */

import java.util.Formatter;

import java.util.Locale;

public class Main {
    public static String getRoundedString(double value, int powerOf10) {
        StringBuilder builder = new StringBuilder();
        if (powerOf10 < Integer.MAX_VALUE - 100) {
            value = roundToPowerOf10(value, powerOf10);
        }
        Formatter formatter = new Formatter(builder, Locale.getDefault());
        String format;
        if (powerOf10 < 0) {
            format = "%." + (-powerOf10) + "f";
        } else {
            format = "%.0f";
        }
        formatter.format(format, value);
        return builder.toString();
    }

    public static double roundToPowerOf10(double value, int powerOf10) {
        if (Double.isInfinite(value) || Double.isNaN(value)) {
            return value;
        }

        value *= Math.pow(10, -powerOf10);
        value = Math.round(value);
        value /= Math.pow(10, -powerOf10);
        return value;
    }
}

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