Re: java

[Thomas Kirsch <tkirsch1@swbell.net>]

"Jens B. Jorgensen" wrote:

> Goeman Stefan wrote:
>
> > Hello,
> >
> > I know, this is not really a question about Debian.
>
> You got that right.
>
> > The question is actually very simple. I want to convert a
> > string to a double.
> >
> > There is a method in the java.lang.Double named
> >  parseDouble
> >
> > When I insert a line like
> > double d = Double.parseDouble(x);
> > in my program, I get the error:
> > Method parseDouble(java.lang.String) not found in class java.lang.Double
>
> This method is only in java.lang.Double since JDK 1.2. You must have an earlier
> version.
>
> > There is also another method in the java.lang.Double class that should do
> > the same,
> > i.e. method valueOf
> >
> > Now, when I insert a line like
> > double d = Double.valueOf(x);
> > in the program, i get the error:
> > Incompatible type for declaration. Can't convert java.lang.Double to double.
>
> Yup, because Double.valueOf() returns type java.lang.Double, not simply double. What
> you want is:
>
> double d = Double.valueOf(x).doubleValue();
>
> > in the program,
> > (Casting does not solve this problem)
>
> Nope. There's no such thing as
>
> Double::operator double()
>
> such as there _might_ be if this were C++, which it isn't.
>
> > Does anybody know what is going wrong??
> >
> > Greetings,
> >
> > Stefan.
>
> --
> Jens B. Jorgensen
> jens.jorgensen@cmgisolutions.com
>
> --
> Unsubscribe?  mail -s unsubscribe debian-user-request@lists.debian.org < /dev/null

You also can use the following which in my opinion is simpler:
String num = 3.4235;
double num1 = Double.parseDouble(num);

This is supported only in Java 2.