I stand corrected! I even went as far as creating a second method that declared another local variable with the same identifier and type as in my first method and this compiled and ran without a hitch. What the compiler will definitely not let us do is to redeclare a local variable within the same method scope.
I'm not sure why anybody would want to use the same identifier in several different local scopes? And, Sina, thank you for pointing out the extremely obvious case of instance identifiers and local idenfifiers in the case of our accessor methods!
----- Original Message ----- From: "Sina Bahram" <sbahram@xxxxxxxxx>
To: <program-java@xxxxxxxxxxxxx> Sent: Tuesday, September 07, 2010 4:54 PM Subject: [program-java] Re: Java: PrecedenceI hate to disagree, but it absolutely will. I just compiled and tested a solution to verrify what I thought I already knew.
You can shadow variables all you like.For a conceptual aid, think of how setters work. Often time, the argument name is the same as the inner name, leading to code like
this.
public void setAge(int age) {
this.age = age;
}
Take care,
Sina
-----Original Message-----
From: program-java-bounce@xxxxxxxxxxxxx
[mailto:program-java-bounce@xxxxxxxxxxxxx] On Behalf Of Jeffrey Fidler
Sent: Tuesday, September 07, 2010 4:30 PM To: program-java@xxxxxxxxxxxxx Subject: [program-java] Re: Java: PrecedenceHello, Jim and all. The Java compiler will not allow you to redeclare a local variable having the same identifier value as the instance variable identifier as you have supplied in your example. Although C++ will allow this sort of scope hiding, Java will
not. Thanks & kind regards, Jef ----- Original Message ----- From: "Sina Bahram" <sbahram@xxxxxxxxx> To: <program-java@xxxxxxxxxxxxx> Sent: Tuesday, September 07, 2010 4:15 PM Subject: [program-java] Re: Java: Precedence Jim, My appologies, no slap down intended. Sorry, was probably far too Socratic in my response. Care to post the whole code? Take care, Sina -----Original Message----- From: program-java-bounce@xxxxxxxxxxxxx [mailto:program-java-bounce@xxxxxxxxxxxxx] On Behalf Of Corbett, James Sent: Tuesday, September 07, 2010 3:53 PM To: 'program-java@xxxxxxxxxxxxx' Subject: [program-java] Re: Java: Precedence Hi: Obviously zero. ...Ok, the reason I ask was because in this piece of code that I've inherited x for lack of a better name is used in at least 30 places in the class and the class level x is declared as transient. I'm trying to figure this mess out and thought I would ask the initial question with out the slap down. Jim -----Original Message----- From: program-java-bounce@xxxxxxxxxxxxx [mailto:program-java-bounce@xxxxxxxxxxxxx] On Behalf Of Sina Bahram Sent: September 7, 2010 15:19 To: program-java@xxxxxxxxxxxxx Subject: [program-java] Re: Java: Precedence Jim, You should be able to answer this question yourself based on first principles. Let's examine what you have. You have a method, and in there you declare a variable named x. absolutely nothing else matters, even a million other definitions of x in a million other scopes, because the next line returns x, and the x in the immediate scope is the variable you just defined; thus, 11 is returned. Also, don't do x=0 when defining your variable. if you want to assign a value to x, then do it in your constructor. Furthermore, x is an int, which means it defaults to 0. What if we change that line to "return this.x;"? Can you tell me what value is returned? Take care, Sina ________________________________ From: program-java-bounce@xxxxxxxxxxxxx [mailto:program-java-bounce@xxxxxxxxxxxxx] On Behalf Of Corbett, James Sent: Tuesday, September 07, 2010 2:21 PM To: 'program-java@xxxxxxxxxxxxx' Subject: [program-java] Java: Precedence Hello all: I know y'all say don't do that but let's just pretend. If a member is declared private to the class such as Public Class MYClass { Private int x = 0; Public MYClass() { } Public int getX () { int x = 11; return x; } } What would you expect to have returned as a value of .getX()? Jim James M. Corbett Programmer / Analyst | Canada Revenue Agency | Agence du revenue du Canada 875 Heron Rd. Ottawa, On. K1A0L5 James.Corbett@xxxxxxxxxxxxx Telephone | Téléphone: (613) 941-1338 Facsimile | Télécopieur: (613) 941-2261 Government of Canada | Gouvernement du Canada
