public String getProperty(String key) {
        if (properties == null) {
            return null;
        }
        return properties.getProperty(key);
    }
public String getProperty(String key) {
        if (properties == null) {
            return null;
        }
        return properties.getProperty(key);
    }
public String getProperty ( String key ) { if ( properties == null ) { return null ; } return properties . getProperty ( key ) ; }
Get property value according to property key

@param key
@return property value
Get property value according to property key