public Double getDoubleValue(final String key) {
		final String value = getValue(key);
		if (value == null) {
			return null;
		}
		return Double.valueOf(value);
	}
public Double getDoubleValue(final String key) {
		final String value = getValue(key);
		if (value == null) {
			return null;
		}
		return Double.valueOf(value);
	}
public Double getDoubleValue ( final String key ) { final String value = getValue ( key ) ; if ( value == null ) { return null ; } return Double . valueOf ( value ) ; }
Returns double value of given property or {@code null} if property not found.
Returns double value of given property or {