Question

Return data type of isDigit(char ch) is:

Options

• char

• boolean

• Boolean

• bool

Answer 1

boolean

Explanation:

• Purpose: The Character.isDigit(char ch) method in Java checks whether a character is a numeric digit (0-9).
• Return Value: Since the check can only result in a true or false outcome, it returns a primitive boolean value.
• Language Rule: Java uses lowercase boolean for this primitive type, unlike bool in C++ or the Boolean wrapper class object.