❔ HeadFirst Design Pattern
So I started with this Book today. First problem starts with the Duck Project:
and when he tests he makes an instance of an abstract class ???? Is this a Java thing that works but not in C#?
T
TheRanger•387d ago
he did not make an instance of an abstract class
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fateos•387d ago
Duck mallard = new MallardDuckk
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TheRanger•387d ago
Duck is an abstract class
MallardDuckk isnt
F
fateos•387d ago
but how can you say Duck mallard = ?
T
TheRanger•387d ago
he's making an instance of
MallardDuckk, not Duck
its upcastedF
fateos•387d ago
so you can make a variable of Duck but not with the new operator
T
TheRanger•387d ago
yes
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Pobiega•387d ago
variable can be
Duck, the instance can't.
abstract just means "you cant create instances of this type"F
fateos•387d ago
oh okey
so my problem is different
F
fateos•387d ago
F
fateos•387d ago
this is in my program.cs
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TheRanger•387d ago
what does the error message say
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Pobiega•387d ago
That should be fine, assuming your namespaces and stuff are correct.
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fateos•387d ago
F
fateos•387d ago
is it because my class has the same name as my project?
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TheRanger•387d ago
dont name ur namespace and class the same name
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Pobiega•387d ago
Your type shares a name with the namespace.
yes
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fateos•387d ago
so I have to find a way to refactor all namespaces
in my project
P
Pobiega•387d ago
thats fairly easy, just use the built-in renaming tool. Ctrl+R, R by default.
set your cursor (the writing marker) on the namespace and do the shortcut
F
fateos•387d ago
oh thats coolk
thank you
so does this replace everyything in my solution or project?
and is it casesensitiv and matches the exact word?
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Pobiega•387d ago
namespaces are case sensitive
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fateos•387d ago
because I was using CTRL + H all this time
yes I know but the CTRL+R,R I mean
P
Pobiega•387d ago
so, thats your normal text-based search and replace
the rename tool follows code references
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fateos•387d ago
for example I wanna replace foot but have other variable called football would CTRL + R, R also change the foot in football?
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Pobiega•387d ago
no
its not doing it by text
its doing it by the code identifier
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fateos•387d ago
by code identifier u mean if I change namespace it only looks for other namespaces
and not variables or anything else
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Pobiega•387d ago
yeah, its context aware
if you are changing a namespace, it only changes namespaces.
but it changes them everywhere they are used, including in fully qualified type names etc
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fateos•387d ago
so for variables I shouldnt use CTRL+R,R
P
Pobiega•387d ago
yes you should
its context aware.
it knows what it is changing
its NOT a string based search and replace.
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fateos•387d ago
hmm ok so when would u use CTRL + H ?
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Pobiega•387d ago
never, for changing code
search and replace is dangerous, as "foot" and "football" shows
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fateos•387d ago
ye I didnt know about CTRL+R,R so I would always go with CTRL+H and go each change one step at a time to make sure everything gets renamed correctly
thankk you all I just had to put using DuckProgram; and now it works
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Pobiega•387d ago
you can set a "default namespace" in your project properties too
so a new file wont get
Duck by defaultF
fateos•387d ago
well its my fault I need a Duck class but I can call my project whatever
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Pobiega•387d ago
you could just rename the
Duck class 🙂
DuckBase or somethingF
fateos•387d ago
it wouldnt make sense to change the Duck class it makes more sense to rename the Project
P
Pobiega•387d ago
sure, but more work 🙂
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fateos•387d ago
how? CTRL R, R did it perfectly
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Pobiega•387d ago
¯\_(ツ)_/¯
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fateos•387d ago
🙂
A
Accord•386d ago
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