Edit C:\Program Files\Java\jdk1.8.0_121\javafx\util\converter\NumberStringConverter.java

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
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 */

package javafx.util.converter;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import javafx.util.StringConverter;

/**
 * <p>{@link StringConverter} implementation for {@link Number} values.</p>
 * @since JavaFX 2.1
 */
public class NumberStringConverter extends StringConverter<Number> {

// ------------------------------------------------------ Private properties

final Locale locale;
    final String pattern;
    final NumberFormat numberFormat;

// ------------------------------------------------------------ Constructors
    public NumberStringConverter() {
        this(Locale.getDefault());
    }

public NumberStringConverter(Locale locale) {
        this(locale, null);
    }

public NumberStringConverter(String pattern) {
        this(Locale.getDefault(), pattern);
    }

public NumberStringConverter(Locale locale, String pattern) {
        this(locale, pattern, null);
    }

public NumberStringConverter(NumberFormat numberFormat) {
        this(null, null, numberFormat);
    }

NumberStringConverter(Locale locale, String pattern, NumberFormat numberFormat) {
        this.locale = locale;
        this.pattern = pattern;
        this.numberFormat = numberFormat;
    }

// ------------------------------------------------------- Converter Methods

/** {@inheritDoc} */
    @Override public Number fromString(String value) {
        try {
            // If the specified value is null or zero-length, return null
            if (value == null) {
                return null;
            }

value = value.trim();

if (value.length() < 1) {
                return null;
            }

// Create and configure the parser to be used
            NumberFormat parser = getNumberFormat();

// Perform the requested parsing
            return parser.parse(value);
        } catch (ParseException ex) {
            throw new RuntimeException(ex);
        }
    }

/** {@inheritDoc} */
    @Override public String toString(Number value) {
        // If the specified value is null, return a zero-length String
        if (value == null) {
            return "";
        }

// Create and configure the formatter to be used
        NumberFormat formatter = getNumberFormat();

// Perform the requested formatting
        return formatter.format(value);
    }

/**
     * <p>Return a <code>NumberFormat</code> instance to use for formatting
     * and parsing in this {@link StringConverter}.</p>
     */
    protected NumberFormat getNumberFormat() {
        Locale _locale = locale == null ? Locale.getDefault() : locale;

if (numberFormat != null) {
            return numberFormat;
        } else if (pattern != null) {
            DecimalFormatSymbols symbols = new DecimalFormatSymbols(_locale);
            return new DecimalFormat(pattern, symbols);
        } else {
            return NumberFormat.getNumberInstance(_locale);
        }
    }
}

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