How can you check if a given character is a digit, a letter or a space?

We can check if a given character is a digit, a letter or a space by using the following methods of Character class:

1. isDigit(char) — It returns true if the specified character is a digit; returns false otherwise.
   Syntax:
   boolean isDigit(char ch)

2. isLetter(char) — It returns true if the specified character is a letter; returns false otherwise.
   Syntax:
   boolean isLetter(char ch)

3. isLetterOrDigit(char) — It returns true if the specified character is a letter or a digit; returns false otherwise.
   Syntax:
   boolean isLetterOrDigit(char ch)

4. isWhitespace(char) — It returns true if the specified character is whitespace; returns false otherwise.
   Syntax:
   boolean isWhitespace(char ch)