round double value by digit - Android java.lang

Android examples for java.lang:Math

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Description

round double value by digit

Demo Code

/*/*from   ww w  .j  av a2  s  .  c o m*/
 * (C) Copyright Itude Mobile B.V., The Netherlands
 * 
 * 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.
 */
//package com.java2s;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

public class Main {
    /**
     * @param value Value that needs to be rounded
     * @param digits number of digits that needs to be rounded to.
     * @return double, with supplied <i>digits</i>
     */
    public static double round(double value, int digits) {
        DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols(
                Locale.getDefault());
        otherSymbols.setDecimalSeparator('.');// Make sure the decimal separator is a dot, so Double.valueOf always works

        DecimalFormat formatter = new DecimalFormat();
        formatter.setMaximumFractionDigits(digits);
        formatter.setMinimumFractionDigits(digits);
        formatter.setGroupingUsed(false);
        formatter.setDecimalFormatSymbols(otherSymbols);

        return Double.valueOf(formatter.format(value));
    }
}

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