public static boolean isLetterOrDigit(char ch)

// 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);
    }
}

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

// 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);
    }
}

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