Very easy question about variables

Question

Can I convert float-variable to String-variable?

Answer 1

Hi, a very easy way to convert almost anything is
called "typecasting". It might sound difficult, but
it isn't.
You use it like this example
> String outcome;
Double input;
input = 3.54789654587;
Output = ""+input;
That's not casting. It's implicit formatting.
What it does is making an empty string and pasting
your number behind it. VERY easy! You can do this
with allmost every type of variables.What it's doing is creating a StringBuffer, appending an empty string to it, then appending the result of calling toString on the Double, which is itself a String. (Though things change a bit in jdk1.5.) It works because StringBuffer.append has versions for each primitive type, and toString exists for all Objects.
One problem is that it's not efficient -- you're doing a lot of work behind the scenes to do something that can be done much more simply. But the bigger problem is that it's using operators in a roundabout way and with implicit results. So it's sort of a hack. "+" is the append operator for Strings (well it actually comes down to an implicit method call, or several). Putting the double on the right side of that also causes an implicit format. So you're implicitly formatting a value, and then appending it to nothing, to get a result. You're not actually meaning to append, you're meaning to format, but you're using an append operator.
The more straightforward way to do it is simply to explicitly format it, using the methods already shown on this thread, or using java.text.DecimalFormat.