public void setDefaultNumberFormat(Format format) {
        for (Map.Entry<String, Format> entry : formats.entrySet()) {
            if (entry.getValue() == generalNumberFormat) {
                entry.setValue(format);
            }
        }
        defaultNumFormat = format;
    }
<p>
Sets a default number format to be used when the Excel format cannot be parsed successfully. <b>Note:</b> This is
a fall back for when an error occurs while parsing an Excel number format pattern. This will not affect cells
with the <em>General</em> format.
</p>
<p>
The value that will be passed to the Format's format method (specified by <code>java.text.Format#format</code>)
will be a double value from a numeric cell. Therefore the code in the format method should expect a
<code>Number</code> value.
</p>

@param format A Format instance to be used as a default
@see java.text.Format#format
fastexcel-test/src/test/java/cn/idev/excel/test/temp/dataformat/DataFormatter1.java