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Character.isLetterOrDigit() in Java with examples
  • Last Updated : 06 Dec, 2018

The java.lang.Character.isLetterOrDigit(char ch) is an inbuilt method in java which determines if the specified character is a letter or digit.

Syntax:

public static boolean isLetterOrDigit(char ch)

Parameters: The function accepts a single mandatory parameter ch which signifies the character to be tested.

Return value: This function returns a boolean value. The boolean value is true if the character is a letter or digit else it false.

Below programs illustrate the above method:



Program 1:




// Java program to illustrate the
// Character.isLetterOrDigit() method
  
import java.lang.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // two characters
        char c1 = 'Z', c2 = '2';
  
        // Function to check if the character is letter or digit
        boolean bool1 = Character.isLetterOrDigit(c1);
        System.out.println(c1 + " is a letter/digit ? " + bool1);
  
        // Function to check if the character is letter or digit
        boolean bool2 = Character.isLetterOrDigit(c2);
        System.out.println(c2 + " is a letter/digit ? " + bool2);
    }
}


Output:

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

Program 2:




// Java program to illustrate the
// Character.isLetterOrDigit() method
  
import java.lang.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // assign character
        char c1 = 'D', c2 = '/';
  
        // Function to check if the character is letter or digit
        boolean bool1 = Character.isLetterOrDigit(c1);
        System.out.println(c1 + " is a letter/digit ? " + bool1);
  
        // Function to check if the character is letter or digit
        boolean bool2 = Character.isLetterOrDigit(c2);
        System.out.println(c2 + " is a letter/digit ? " + bool2);
    }
}


Output:

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

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isLetterOrDigit(char)

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