Which package I need to import for string class so as to use character isLetter Boolean function which run successfully?

Question

For other character inbuilt function don't execute easily and many times error occurs while execution.

Answer 1

Use java.lang.Character class or try
java.lang.*
It is not associated with String class.

Answer 2

You must be doing it wrong, kindly share your code here.

Answer 3

String is present in java.lang package which is implicitly imported in all java programs.

Answer 4

I tried using same but it won't execute.