Question: I want to convert some numbers which I got as strings into Doubles, but these numbers are not in US standard locale, but in a different one. How can I do that?

Answer: 
NumberFormat is the way to go, but you should be aware of its peculiarities which crop up when your data is less than 100% correct.

I found the following usefull:

<http://www.ibm.com/developerworks/java/library/j-numberformat/index.html>

If your input can be trusted then you don't have to worry about it.
This should be no problem using java.text.DecimalFormat.