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java Programming Glossary: mymap.keyset

How to convert Set<String> to String[]?

http://stackoverflow.com/questions/5982447/how-to-convert-setstring-to-string

fails Map String myMap gpxlist.getAll Set String myset myMap.keySet String GPXFILES1 String myset.toArray Here it fails. How can..

Java foreach efficiency

http://stackoverflow.com/questions/904582/java-foreach-efficiency

like this Map String String myMap ... for String key myMap.keySet System.out.println key System.out.println myMap.get key So is.. key System.out.println myMap.get key So is myMap.keySet called once in the foreach loop I think it is but want your.. opinion. I would like to know if using foreach in this way myMap.keySet has a performance impact or it is equivalent to this Set String..