Is this Java Glossary entry for "static" correct?
Hi all,
I'm trying to understand static variables.
This glossary: http://mindprod.com/jgloss/static.html, has several lines that I don't think are correct, but I could certainly be wrong myself.
static final when applied to a variable is Javanese for "constant".
All static methods are automatically final. It is not strictly speaking an error to
mark them final, but it is redundant and considered bad form.I made a test class with a public static int x in it. I did not initialize the int. The compiler had no problems with it. I then made it a public static final int and the compiler (Eclipse, Java 1.5) complained that the int had not been initialized. Therefore, it seems to me that static and static final are different.
They can call instance methods only if they use their own object
references -- not rely on this.I made a class with a public static Object x. I then set x to be this in a method. The compiler had no problems with this.
Am I misunderstanding what the author means in the two quotes above?
Thanks!
Tim
Edit: Woops, the above quotes talk about methods, not variables. Shouldn't the same be true of variables, though? How can a static constant relay on 'this"?
TimQuinn wrote:
Hi all,
I'm trying to understand static variables.
This glossary: http://mindprod.com/jgloss/static.html, has several lines that I don't think are correct, but I could certainly be wrong myself.
static final when applied to a variable is Javanese for "constant". This is correct.
All static methods are automatically final.This is incorrect.
public class Scratch {
final static void foo() {}
class ZZZ extends Scratch {
static void foo() {}
}Notice the difference when Sractch.foo is declared final vs. when it's not.
I made a test class with a public static int x in it. I did not initialize the int. The compiler had no problems with it. I then made it a public static final int and the compiler (Eclipse, Java 1.5) complained that the int had not been initialized. Therefore, it seems to me that static and static final are different.Yes, they are.
Note, however, that final means something different for a variable than for a method, and that Roedy was talking about both in the same paragraph.
They can call instance methods only if they use their own object
references -- not rely on this
I made a class with a public static Object x. I then set x to be this in a method. The compiler had no problems with this.Because the calling method wasn't static. He's saying a static method can call an instance method only if it has it's own reference to an instance, since there is no this in a static method. He is correct.
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Hi All,
While creating Source system in my system i am getting this message "No entry for BW_USER in table RSADMIN available" , What is mean by this?
Reply back me to [email protected]
Regards,
Kiranhi Kiran,
means no aleremote user maintained for bw, you can maintain via rsa1->settings->global settings->glob settings enter bw user ale. normally ALEREMOTE is used.
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