Java Character isLetterOrDigit() Method

The isLetterOrDigit(char ch) method of character class determines whether the given(or specified) character is a letter or digit or not.

A character is considered to be a letter or digit if the Character.isLetter(char ch) or the Character.isDigit(char ch) method true for the given character.

Note: The above method cannot be used to handle the supplementary characters. In order to handle the supplementary characters, we can use the isLetterOrDigit(int) method.

Syntax

Parameter

The above method requires only one parameter:

a.)The character that needs to be tested.

Return Value

The isLetterOrDigit(char ch) method returns a boolean value i.e. true, if the given(or specified) character is a letter or digit. Otherwise, the method returns false.

Example 1

public class JavaCharacterisLetterOrDigitExample1 {
   public static void main(String[] args) {
      // Create four char primitives ch1, ch2, ch3 and ch4.
      char ch1;
      char ch2;
      char ch3;
      char ch4;
      // Assign the values to ch1, ch2, ch3 and ch4.
      ch1 = 'A';
      ch2 = '1';
      ch3 = 'U';
      ch4 = '2';
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1 = Character.isLetterOrDigit(ch1);
      boolean b2 = Character.isLetterOrDigit(ch2);
      boolean b3 = Character.isLetterOrDigit(ch3);
      boolean b4 = Character.isLetterOrDigit(ch4);
      String str1 = "The first character '"+ ch1+ "' is a letter or digit: " + b1;
      String str2 = "The second character '"+ch2+"' is a letter or digit: " + b2;
      String str3 = "The third character '"+ch3+ "' is a letter or digit: " + b3;
      String str4 = "The fourth character '"+ch4+ "' is a letter or digit: " + b4;
      // Print the values of b1, b2, b3 and b4;
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
      System.out.println( str4 );
   }
}

Test it Now

Output:

The first character 'A' is a letter or digit: true
The second character '1' is a letter or digit: true
The third character 'U' is a letter or digit: true
The fourth character '2' is a letter or digit: true

Example 2

public class JavaCharacterisLetterOrDigitExample2 {
   public static void main(String[] args) {
      // Create four char primitives ch1, ch2, ch3 and ch4.
      char ch1;
      char ch2;
      char ch3;
      char ch4;
      // Assign the values to ch1, ch2, ch3 and ch4.
      ch1 = 'A';
      ch2 = '1';
      ch3 = '*';
      ch4 = '$';
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1 = Character.isLetterOrDigit(ch1);
      boolean b2 = Character.isLetterOrDigit(ch2);
      boolean b3 = Character.isLetterOrDigit(ch3);
      boolean b4 = Character.isLetterOrDigit(ch4);
      String str1 = "The first character '"+ ch1+ "' is a letter or digit: " + b1;
      String str2 = "The second character '"+ch2+"' is a letter or digit: " + b2;
      String str3 = "The third character '"+ch3+ "' is a letter or digit: " + b3;
      String str4 = "The fourth character '"+ch4+ "' is a letter or digit: " + b4;
      // Printr the values of b1, b2, b3 and b4.
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str3 );
      System.out.println( str4 );
   }
}

Test it Now

Output:

The first character 'A' is a letter or digit: true
The second character '1' is a letter or digit: true
The third character '*' is a letter or digit: false
The fourth character '$' is a letter or digit: false

Example 3

import java.util.Scanner;
public class JavaCharacterisLetterOrDigitExample3 {
   public static void main(String[] args) {
    // Ask for user input
       System.out.print("Enter the first input:");
    // Use the Scanner class to get the user input
       Scanner s1 = new Scanner(System.in);
    // Gets the user input
       char[] value1 = s1.nextLine().toCharArray();
    // Check whether the user input is a letter or not.
       for (char ch1 : value1) {
   boolean result1 = Character.isLetterOrDigit(ch1);
    // print the result
       if(result1){
System.out.println("The character '" + ch1 + "' is a letter or digit. ");				
                  }
     else{
System.out.println("The character '" + ch1 + "' is neither a letter nor a digit.");
           }		
       System.out.print("Enter the second input:");
       Scanner s2 = new Scanner(System.in);
       char[] value2 = s2.nextLine().toCharArray();
       for (char ch2 : value2) {
      boolean result2 = Character.isLetterOrDigit(ch2);
      if(result2){
System.out.println("The character '" + ch2 + "' is a letter or digit. ");				
                }
      else{
System.out.println("The character '" + ch2 + "' is neither a letter nor a digit.");
        }		
      System.out.print("Enter the third input:");
       Scanner s3 = new Scanner(System.in);
       char[] value3 = s3.nextLine().toCharArray();
       for (char ch3 : value3) {
      boolean result3 = Character.isLetterOrDigit(ch3);
      if(result2){
System.out.println("The character '" + ch3 + "' is a letter or digit. ");				
                }
      else{
System.out.println("The character '" + ch3 + "' is neither a letter nor a digit.");
           }		
         }
       }
     }
  }
}

Output:

Enter the first input:R
The character 'R' is a letter or digit. 
Enter the second input:9
The character '9' is a letter or digit. 
Enter the third input:A
The character 'A' is a letter or digit.

Java Character isLetterOrDigit() Method

The isLetterOrDigit(int codePoint) method of Character class determines whether the given(or specified) character is a letter or digit Sor not.

A character is considered to be a letter or digit if the Character.isLetter(int codePoint) or the Character.isDigit(int codePoint) method returns true for the given character.

Syntax

Parameter

codePoint: It is the codePoint which is the character that needs to be tested.

Return Value

The isLetter(int codePoint)method returns a Boolean value i.e. true if the given(or specified) character is a letter or digit. Otherwise, the method returns false.

Example 4

public class JavaCharacterisLetterOrDigitExample4{
   public static void main(String[] args) {
    // Create four char primitives codePoint1, codePoint2, codePoint3 and codePoint4.
      int codePoint1;
      int codePoint2;
      int codePoint3;
      int codePoint4;
      // Assign the values to codePoint1, codePoint2, codePoint3 and codePoint4.
      codePoint1 = 26;
      codePoint2 = 134;
      codePoint3= 198;
      codePoint4 = 408;
      // Create four boolean primitives b1, b2, b3 and b4.
      boolean b1, b2, b3,b4;
      // Check whether the codePoint1, codePoint2, codePoint3 and codePoint4  are letters or digits or not and assign the results to b1, b2, b3 and b4.
      b1 = Character.isLetterOrDigit(codePoint1);
      b2 = Character.isLetterOrDigit(codePoint2);
      b3 = Character.isLetterOrDigit(codePoint3);
      b4 = Character.isLetterOrDigit(codePoint4);

      String str1 = "The first codePoint  '"+codePoint1 + "' is a letter or a  digit: " + b1;
      String str2 = "The second codePoint '"+codePoint2 + "' is a letter or a  digit: " + b2;
      String str3 = "The third codePoint  '"+codePoint3 + "' is a letter or a  digit: " + b3;
      String str4 = "The fourth codePoint '"+codePoint4 + "' is a letter or a digit: " + b4;
      // Print the values of str1, str2, str3 and str4.
      System.out.println(str1);
      System.out.println(str2);
      System.out.println(str3);
      System.out.println(str4);
   }
}

Test it Now

Output:

The first codePoint  '26' is a letter or a  digit: false
The second codePoint '134' is a letter or a  digit: false
The third codePoint  '198' is a letter or a  digit: true
The fourth codePoint '408' is a letter or a digit: true

Example 5

import java.util.Scanner;
public class JavaChracterisLetterOrDigiExample5{
    public static void main(String[] args) {
    // Ask the user for first input.
       System.out.print("Enter the first input:");
    // Use the Scanner class to get the user input.
       Scanner s1 = new Scanner(System.in);
    // Gets the user input.
       char[] value1 = s1.nextLine().toCharArray();
    // Check whether the user input is a lettter or digit or not.
       for (char ch1 : value1) {
   boolean result1 = Character.isLetterOrDigit(ch1);
    // Print the first result.
       if(result1){
System.out.println("The character '" + ch1 + "' is a letter or digit. ");				
                  }
     else{
System.out.println("The character '" + ch1 + "' is neither a letter nor digit.");
           }		
       System.out.print("Enter the second input:");
       Scanner s2 = new Scanner(System.in);
       char[] value2 = s2.nextLine().toCharArray();
       for (char ch2 : value2) {
      boolean result2 = Character.isLetterOrDigit(ch2);
      if(result2){
System.out.println("The character '" + ch2 + "' is a letter or digit. ");				
                }
      else{
System.out.println("The character '" + ch2 + "' is neither a letter nor digit.");
        }		
      System.out.print("Enter the third input:");
       Scanner s3 = new Scanner(System.in);
       char[] value3 = s3.nextLine().toCharArray();
       for (char ch3 : value3) {
      boolean result3 = Character.isLetterOrDigit(ch3);
      if(result2){
System.out.println("The character '" + ch3 + "' is a letter or digit. ");				
                }
      else{
System.out.println("The character '" + ch3 + "' is neither a letter nor digit.");
           }		
         }
       }
     }
  }
}

Output:

Enter the first input:A
The character 'A' is a letter or digit. 
Enter the second input:6
The character '6' is a letter or digit. 
Enter the third input:^
The character '^' is a letter or digit..

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