[665] in java-interest
Re: Java compiler is trying too hard for me
daemon@ATHENA.MIT.EDU (Tientien Li)
Wed Jul 12 16:06:40 1995
Date: Wed, 12 Jul 1995 10:49:14 -0700
From: li@deming.Jpl.Nasa.Gov (Tientien Li)
To: dan.evans@peri.com
Cc: li@deming.Jpl.Nasa.Gov, java-interest@java.sun.com
>
> > The Java compiler "javac" won't let me do the following type of code:
> >
> > class smartjavac {
> > public void init() {
> > int x;
> > for (int i=0; i<3; i++) {
> > if (i == 0) x = i;
> > else if (i == 1) x = i;
> > else x = i;
> > }
> > System.out.println("ValueOfX is " + x );
> > }
> > }
>
> Try giving x an initial value. The compiler may think that it is possible
> that the loop may be executed 0 times, since compile-time determination
> is not always possible.
>
> Dan Evans
> dan.evans@peri.com
>
Dan,
OK, I agree with you its a good idea to initialize variables. From now on,
I'll try to init all local variable to make "javac" happy. However, this
problem is a bit more complicated, e.g., the "javac" will let the following
code thru:
class smartjavac {
int x; // x is now moved to outside....
public void init() {
for (int i=0; i<3; i++) {
if (i == 0) x = i;
else if (i == 1) x = i;
else x = i;
}
System.out.println("ValueOfX is " + x );
}
}
Looks like "javac" only check this condition for variables defined locally
within the current function scope.
--
Tientien Li
li@deming.jpl.nasa.gov
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