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Object-Oriented COBOL: Past, Present, and Future

Explore the evolution of COBOL from procedural to Object-Oriented paradigm, ANSI standards, COBOL 2002 features, OO elements, and COBOL's future roadmap. Learn how COBOL remains relevant and adaptable in modern programming. Discover resources and references to delve deeper into Object-Oriented COBOL.

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Object-Oriented COBOL: Past, Present, and Future

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  1. Object-Oriented COBOL? Senior Seminar Sp. 2007 Trevor Simpson

  2. Object-Oriented COBOL? • Why the “?” • Isn’t COBOL dead

  3. COBOL = Lazarus • Created in 1959 • First standard finalized by ANSI in 1960 • Latest of 4 major revisions is COBOL 2002

  4. COBOL Background • Procedural Language • Tightly Structured • Strongly Typed • Extremely Stable • Highly Secure • Batch Processing

  5. Like a recipe Everything done in order Functions Modules Call Variable Like life Different “objects” interacting Methods Objects Message Member Procedural vs. Object-Oriented

  6. The Object-Oriented Paradigm • 4 main tenets • Inheritance • Dog IS A Animal • Abstraction • Hide details of implementation • Polymorphism • Determine exact method implementation at run-time • I.e. method or operator overloading • Encapsulation • Data and Methods in ONE location

  7. ANSI 85 Standard COBOL • Columnar Restrictions • Cols. 1-6 Reserved for sequence #’s • Col. 7 Reserved for special character • Cols. 8-72 usable, anything beyond 72 ignored • Other restrictions on where Names and Type definitions can start

  8. ANSI 85 Standard COBOL • 4 Divisions • Identification Division • Environment Division • Data Division • Procedure Division

  9. ANSI 85 COBOL Example • Assign2.CBL • Report

  10. ANSI 2002 COBOL Standard • Latest Revision Adds Several Features • Boolean Data Type • Recursion • Compiler Directive for Free Format • Inline Comment “*>” • Support for Object Oriented Paradigm

  11. 2002 COBOL OO Elements • Factory • Basically a separate set of code used to handle general object tasks. • Class, Object Keywords • Interfaces • Inherits Keyword • Parameterized Classes (Like a Java Interface Class)

  12. 2002 COBOL OO Elements • Usage Object Reference Clause • Perhaps most powerful OO element added • Allows dataname to be a reference(pointer) • Call Object Handles • Dataname can be set to refer to a specific object type or be set to universal

  13. OO COBOL Examples • DriverStudent • COBOL with VB GUI • COBOL Using XML

  14. COBOL’s Future • Estimates as high as 200 Billion lines of code • New standard creation underway for release in 2008. • Add support for specific collection classes • SortedCollections • KeyedCollections • OrderedCollections • Even touted as better way to learn OO principles

  15. References • Arranga, Edmund C. (1996). Object-Oriented COBOL. New York : SIGS Books & Multimedia • COBOL Standards. (n.d.) Various pages from www.cobolstandards.com • Flint, E. S. (1997). The COBOL jigsaw puzzle: fitting object-oriented and legacy applications together. IBM Systems Journal, 36(1), pp 49-65. Retrieved March 10, 2007 from Wilson Database. • Glass, Robert L. (1997). Cobol--a contradiction and an enigma. Association for Computing Machinery. Communications of the ACM 40(9) pp 11-14. Retrieved March 3, 2007 from ABI/Inform Database. • Hardgrave, Bill C. (Mar/Apr 2000). Cobol in an Object-Oriented World: A Learning Perspective. IEEE Software, 17(2), pp 26. Retrieved March 10, 2007 from Academic Search Elite Database. • Native COBOL Syntax for XML Support. (Mar 30, 2006). WG4 N0248 TDR24716. Retrieved March 20, 2007 from http://www.cobolstandard.info/wg4/document.html • Sammet, Jean E. (1985). Brief Summary of the Early History of COBOL. Annals of the History of Computing 7(4) pp 288. Retrieved March 3, 2007 from ABI/Inform Database. • Sokol, Marc. (1990). Reader Viewpoint: Why 4GLs Cannot Kill COBOL. Journal of Systems Management, 41(5) pp 35-37. Retrieved March 13, 2007 from ABI/Inform Database.

  16. QUESTIONS???

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