Labels:dialog box | sky | web site OCR: Object- Oriented Programming Symbol A subclass of String Immutable: cati not modify Symbols once created Two Symbols are iff they have the sane characters Implementation The class maintains a symbol table Upon "creation the table 1S checked first Used for message selectors Overriden methods index put: char hash shallowCopy Class Protocol intern aString This method does the table lookup HArTT Porter 2001 Imnutable same Hart
