Is there any convention for data fields coming before or after the methods? (In Class or Object or Record)

Is there any convention for data fields coming before or after the
methods? (In Class or Object or Record)

References

Reference NO 1

http://stackoverflow.com/questions/15192866/is-there-any-convention-for-data-fields-coming-before-or-after-the-methods-in

Reference NO 2

http://www.freepascal.org/docs-html/user/userse62.html

Reference NO 3

http://docs.python.org/tutorial/classes.html

Reference NO 4

http://www.perl.com/doc/FMTEYEWTK/perltoot.html

Reference NO 5

http://marakana.com/bookshelf/java_fundamentals_tutorial/object_oriented.html

Reference NO 6

http://www.artima.com/objectsandjava/webuscript/ClassesObjects1.html

Reference NO 7

https://doc.openerp.com/v6.1/developer/03_modules_2/

Reference NO 8

http://oreilly.com/catalog/delphi/chapter/ch02.html