Returns a formatted Double value given a specific DecimalFormat If more than 4 integer, then we display the value in scientific notation - Java java.lang

Java examples for java.lang:double Format

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Description

Returns a formatted Double value given a specific DecimalFormat If more than 4 integer, then we display the value in scientific notation

Demo Code

/*//w ww . java 2 s . c  om
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
//package com.java2s;
import java.text.DecimalFormat;

public class Main {
    /**
     * Returns a formatted Double value given a specific DecimalFormat<br>
     * If more than 4 integer, then we display the value in scientific notation
     * @param value
     * @param precision
     * @return a double value formatted as a String
     */
    public static String formatDouble(double value, int precision) {
        String result;
        if (((int) value) > 9999 || ((int) value) < -9999) {
            result = new DecimalFormat("0.######E0").format(value);
        } else
            result = String.valueOf(roundDouble(value, precision));
        return result == null ? "-" : result;
    }

    /**
     * Method that rounds a value to the n precision decimals
     * @param value
     * @param precision
     * @return a double value rounded to n precision
     */
    public static double roundDouble(double value, int precision) {
        int rounder = (int) Math.pow(10, precision);
        return (double) Math.round(value * rounder) / rounder;
    }
}

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