@@stringsize indicates the amount of character data to be returned from a toString() method. It is similar in behavior to @@textsize, except it applies only the char data returned by the Java Object.toString() method. The default will value is 50. The max value is 16384. A value of zero means “use the default.” This value can be modified by a new set command:
set stringsize n
where n is an integer value between 0 and 16384. The new value will immediately show up in the global variable, @@stringsize.