Banned
Another one of my famous quick questions (Java noob):
I have an error:
http://i33.tinypic.com/o7368g.png
and a source:
http://pastebin.com/d732cdaba
when compiled produces:
http://pastebin.com/m7ea0a6ba
Whats wrong?
Problem semi-solved:
Netbeans didn't recognize the int constructor, what is the difference between these two constructors, or is Netbeans just having a fit?:
Code:Circle(int radius) { this.radius = radius; }Code:public void Circle(int radius) { this.radius = radius; }
Last edited by Twinkie; 10-31-2009 at 09:18 PM.
x10 Spammer
This isn't a constructor, it's a method named Circle that takes an int and doesn't return anything.Originally Posted by Twinkie
Be sure to read all pages linked in this post; they have further information that should prove useful. When asking for help, make sure you follow Eric Raymond's and Jon Skeet's guidelines for prompt, accurate responses. Please answer any questions I ask; they're not rhetorical (probably). Any posted code is intended as illustrative example, rather than a solution to your problem to be copied without alteration. Study it to learn how to write your own solution.Misson, not Mission.
Community Paragon
Constructors shouldn't have return type. Just remove the void in front of Circle(int radius) method.
and run it.
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x10 Elder
In theory, but the classname is "Circle" too, so the method's name is illegal. Besides that, method names should never start with a capital.
Constructors are usually defined as
And as gsonline said, that's equivalent to removing the "void" part of the method signature.Code:public <classname>(<arguments) { <body> }
Banned
Well, it is more of a logical question. I already know how to fix the problem, I just want to know why. If a constructor doesn't return anything, then why is putting a void return type wrong (like how specifying that a method is public and specifying engender the same result)?
Community Paragon
The constructor is for initializing the values while creating the object of the class. The java compiler distinguishes the constructor by its name same as classname and no retun type. There is no return type given in a constructor signature (header). The value is this object itself so there is no need to indicate a return value. If it has return type then compiler takes it as method rather than constructor
Hope this helps...
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Banned
Oooo, I confuse no return type with no return value. Thanks for your help
x10 Spammer
Legal, but discouraged. From section 8.4 "Method Declarations" of the Java Language Specification, Third Edition:
A class can declare a method with the same name as the class or a field, member class or member interface of the class, but this is discouraged as a matter of syle.
Be sure to read all pages linked in this post; they have further information that should prove useful. When asking for help, make sure you follow Eric Raymond's and Jon Skeet's guidelines for prompt, accurate responses. Please answer any questions I ask; they're not rhetorical (probably). Any posted code is intended as illustrative example, rather than a solution to your problem to be copied without alteration. Study it to learn how to write your own solution.Misson, not Mission.
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