Character.isLetterOrDigit() in Java with examples

The java.lang.Character.isLetterOrDigit(char ch) method is an inbuilt method in Java that checks whether a given character is either a letter or a digit.

public class GFG {
    public static void main(String[] args) {
        char ch = 'A';
        System.out.println(Character.isLetterOrDigit(ch));
    }
}

true

Explanation: This example checks whether the character 'A' is a letter or digit.

Syntax

public static boolean isLetterOrDigit(char ch)

• Parameters: "ch " The character to be tested.
• Return Value: Returns true if the character is a letter or digit; otherwise, returns false.

Example 1: Checking Letter and Digit Characters

public class GFG {
    public static void main(String[] args) {
        char c1 = 'Z';
        char c2 = '2';
        System.out.println(c1 + " is a letter/digit ? " + 
                           Character.isLetterOrDigit(c1));
        System.out.println(c2 + " is a letter/digit ? " + 
                           Character.isLetterOrDigit(c2));
    }
}

Z is a letter/digit ? true
2 is a letter/digit ? true

Explanation: Both 'Z' (a letter) and '2' (a digit) satisfy the condition, so the method returns true.

Example 2: Checking Letter and Special Character.

public class GFG {
    public static void main(String[] args) {
        char c1 = 'D';
        char c2 = '/';
        System.out.println(c1 + " is a letter/digit ? " + 
                           Character.isLetterOrDigit(c1));
        System.out.println(c2 + " is a letter/digit ? " + 
                           Character.isLetterOrDigit(c2));
    }
}

D is a letter/digit ? true
/ is a letter/digit ? false

Explanation:

• Two characters are defined: 'D' (a letter) and '/' (a special character).
• Character.isLetterOrDigit() checks each character.
• The method returns true for the letter and false for the special character, and the results are printed.

Related Topics:

• Character class in Java
• Character.isLetter() method
• Character.isDigit() method