Edit C:\Program Files\Java\jdk1.8.0_121\javafx\util\converter\FloatStringConverter.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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 */

package javafx.util.converter;

import javafx.util.StringConverter;

/**
 * <p>{@link StringConverter} implementation for {@link Float}
 * (and float primitive) values.</p>
 * @since JavaFX 2.1
 */
public class FloatStringConverter extends StringConverter<Float> {
    /** {@inheritDoc} */
    @Override public Float fromString(String value) {
        // 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;
        }

return Float.valueOf(value);
    }

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

return Float.toString(((Float)value).floatValue());
    }
}

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