Here is a "way" to do this:
to explain line 3:
step 1: get copy of array from index 4 to 6 using Arrays.copyOfRange()
step 2: get list view of the above copy using Arrays.asList()
step 3: get toString() value of the above list which will give you: "[Diving,Tennis,Football]"
step 4: replace "[" and "," and "]" with a space. which will give you: " Diving Tennis Football "
step 5: call trim() on this
String to get the beginning and trailing white-spaces removed
finally you get "Diving Tennis Football"
you can modify above steps as per your requirements.