One concrete subclass of the IBM® Toolbox for Java™ Resource class is com.ibm.as400.resource.RUser, which represents an IBM i user. RUser supports many attribute IDs, each of which you can use to get attribute values.
This example retrieves an attribute value from an RUser:
// Create an RUser object to refer to a specific user.
AS400 system = new AS400("MYSYSTEM", "MYUSERID", "MYPASSWORD");
RUser user = new RUser(system, "AUSERID");
// Get the text description attribute value.
String textDescription = (String)user.getAttributeValue(RUser.TEXT_DESCRIPTION);