#Variable Names

Your variables names are unnecessarily abbreviated and genetic. Also suffixes such as `Arr` are usually unnecessary. Here some example I'd use:

* `str` => `sentence`
* `strArr` => `words`
* `strTemp` => `word`

#Algorithm

You could drop copying the strings into the character array, by using `strArr` directly and simply checking if `j` exceeds the length of the word and printing a space if it does.

Also getting the maximal word length could also be avoided, if you check during output, iff all strings are shorter than `j`.