Character.isLetterOrDigit() in Java with examples
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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