Subject: Doubts on design patterns

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Subject: Doubts on design patterns

Subject: Doubts on design patterns

2004-04-28 - By Ram Kishore

Back

Reply: 1 2 3 4 5 6 7 8

Hi all,
I know design patterns are grouped into three types : Creational,
Structural, and Behavioral.
But my questions are,
1) Why State pattern is listed as behavioral, when it clearly defines
some structure.
2) Why Proxy is listed as a Structural pattern when it clearly has
behavior.
3) what is criteria for determining if a new pattern should be
considered Structural or Behavioral?
4) what is main difference between Decorator and Chain Of
Responsibility?

Plz can anybody throw some light on the above points.Plz don't mention
only definitions,that could be great if you can give valid reasons.

Thanks and regards,
Ram

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<TITLE>Message</TITLE>

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<DIV>
<DIV><FONT face="Comic Sans MS" color=#0000ff><SPAN
class=225523408-27042004><SPAN class=757234604-28042004>Hi
all,</SPAN></SPAN></FONT></DIV>
<DIV><FONT face="Comic Sans MS"><FONT color=#0000ff><SPAN
class=225523408-27042004>I know </SPAN><SPAN class=225523408-27042004>design
</SPAN>patterns are grouped into three types : Creational, Structural, and
Behavioral. </FONT></FONT></DIV>
<DIV>
<DIV><FONT face="Comic Sans MS" color=#0000ff><SPAN
class=225523408-27042004>But my questions are, </SPAN></FONT></DIV></DIV>
<DIV><FONT face="Comic Sans MS"><FONT color=#0000ff><SPAN
class=225523408-27042004>1) Why </SPAN>State pattern is listed as
behavioral, when it clearly defines some structure. </FONT></FONT></DIV>
<DIV><FONT face="Comic Sans MS"><FONT color=#0000ff><SPAN
class=225523408-27042004>2) Why</SPAN> Proxy is listed as a Structural
pattern when it clearly has behavior. </FONT></FONT></DIV>
<DIV><FONT face="Comic Sans MS"><FONT color=#0000ff><SPAN
class=225523408-27042004>3) </SPAN><SPAN class=225523408-27042004>what is
</SPAN>criteria for determining if a new pattern should be considered
Structural
or Behavioral<SPAN class=225523408-27042004>?</SPAN> </FONT></FONT></DIV>
<DIV><SPAN class=225523408-27042004><FONT face="Comic Sans MS" color=#0000ff>4)
what is main difference between Decorator and Chain Of
Responsibility?</FONT></SPAN></DIV>
<DIV><SPAN class=225523408-27042004><FONT face="Comic Sans MS"
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=225523408-27042004><SPAN class=757234604-28042004><FONT
face="Comic Sans MS" color=#0000ff>Plz can anybody throw some light on the
above
points.Plz don't mention only definitions,that could be great if you can give
valid reasons.</FONT></SPAN></SPAN></DIV>
<DIV><SPAN class=225523408-27042004><SPAN class=757234604-28042004><FONT
face="Comic Sans MS" color=#0000ff></FONT></SPAN></SPAN> </DIV>
<DIV><FONT face="Comic Sans MS" color=#0000ff>Thanks and regards,</FONT></DIV>
<DIV align=left><FONT face="Comic Sans MS" color=#0000ff>Ram </FONT></DIV></DIV>
<DIV><FONT face="Comic Sans MS" color=#0000ff></FONT> </DIV></BODY></HTML>
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