Question

What is the return type and function of isUppercase (),toUppercase ()? In JDK.

Answer 1

The return type is Boolean for both.
TThe function of isUpperCase () is used to check whether a character is in upper case or not.

The function of toUpperCase () is used to convert a character in upper case.

Simple

Answer 2

The return type is Boolean for both.

UpperCase () = to check whether a character is in upper case or not.

UpperCase () = to convert a character in upper case.