CIS 644 Tues. Oct. 4, 1999 W7A

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CIS 644 Tues. Oct. 4, 1999 W7A .scenarios
... assignment 2ed object model
assignment Java Pattern patterns
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W6B files were not build correctly (
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Posting grades . will be linked from 644
log page first assignments just checked,
not graded
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Assignment still finding pairs . email
formats Word, Powerpoint, GIF,
Rose FAX send Class model asap.. both
persons must agree !!
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more about semantics of scenarios 1. life time
of an invocation 2. call backs .. vs return
value 3. conditionals, loops
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aha! Visitor behavior is a callback. G. p.
335
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Iterator vs Visitor what is similarity,
what is difference ??
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Who does the traversal for a Visitor? ans 1)
collection self traverse 2) iterator
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Patterns what is it other names typical use
related patterns Composite
Iterator Proxie Visitor
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Interface public interface Iname operations
exceptions
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transparency vs safety

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assignment build Java code snippet for
one pattern with some comments and for
typical operation build single web page
(email or provide url) open assignment
select specific pattern.
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Pattern G. p. 233 command / action /
transaction encapsulate a request as an
object. allows parameterized clients with rs
queue, log of requests
undo
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framework an execution structure
(application, applet, servlet, service
layer, ) with abstract components
e.g. any of the building wizards in I.D.E.s
(Vis. Studio, Café, )
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Pattern G. p. 107 factory method / virtual
constructor defines interface for creating an
object, defers info as to which class to make.
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