Android: Cannot invoke toString() on the primitive type int

Question

If i try nltxt = nllen.toString(); with nllen being int nllen = nl.getLength(); i get the error Cannot invoke toString() on the primitive type int. I want to convert the int to string so i can display the number of entries with Log... Why doesnt it work?

Answer 1

Primitive types aren't objects and as such don't have any methods.

To convert it to a String use String.valueOf(nlTxt).

Answer 2

Primitives do not have any fields or methods. Sometimes the compiler will "autobox" your primitive into the corresponding class, Integer in this case. Perhaps that is what you expected in this case. Sometimes the compiler will not do this. In this case it does not automatically autobox it.

You have a few alternatives:

1. String.valueOf(nltxt)
2. "" + nltxt (or if you have something useful to write along with the number, do "nltxt equals " + nltxt
3. Do the "autoboxing" manually: new Integer(nltxt).toString().
4. Format it in some custom way: String.format("nltxt is %d which is bad%n", nltxt)

Answer 3

You could also use Integer.toString(nllen); for this.