Re: java

["Jens B. Jorgensen" <jens.jorgensen@cmgisolutions.com>]

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