private static String getProperty(Properties properties, String key) {

        // Check if the properties do not exist.
        if (properties == null || properties.getProperty(key) == null) {
            throw new IllegalArgumentException("The property " + key + " does not exist.");
        }

        return properties.getProperty(key);
    }
private static String getProperty(Properties properties, String key) {

        
        if (properties == null || properties.getProperty(key) == null) {
            throw new IllegalArgumentException("The property " + key + " does not exist.");
        }

        return properties.getProperty(key);
    }
private static String getProperty ( Properties properties , String key ) { // Check if the properties do not exist. if ( properties == null || properties . getProperty ( key ) == null ) { throw new IllegalArgumentException ( "The property " + key + " does not exist." ) ; } return properties . getProperty ( key ) ; }
Get the property.

@param  properties  the properties.
@param  key         the property key.

@return  the property.

@throws  IllegalArgumentException  if the property does not exist.
Get the property .