Java Character isJavaLetterOrDigit() Method

The isJavaLetterOrDigit(char ch) method of Character class determines whether the given(or specified) character can be a part of Java identifier as other than the first character.

A character is a part of Java identifier if and only if any of the following conditions is true:

The character is a letter.
The character is a currency symbol like '$'.
The character is a digit.
The character is a connecting punctuation character like '_'.
The character is a numeric letter.
The character is a combining mask.
The character is a non-spacing mask.
The isIdentifierIgnorable() method returns true for the given character.

Syntax

Parameter

ch: It is the character that needs to be tested.

Return Value

The isJavaLetterOrDigit(char ch)method returns a Boolean value i.e. true if the given(or specified) character is a part of Java identifier. Otherwise, the method returns false.

Example 1

public class JavaCharacterisJavaLetterOrDigitExample1 {
    public static void main(String[] args) {
    char ch1 = '3';
    char ch2 = '6';
    char ch3 = '9';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

      System.out.println("The result for the first character is given as:"+ b1 );
      System.out.println("The result for the second character is given as:"+ b2 );
      System.out.println("The result for the third character is given as:"+ b3 );
     }
}  

Output:

The result for the first character is given as:true
The result for the second character is given as:true
The result for the third character is given as:true.

Example 2

public class JavaCharacterisJavaLetterOrDigitExample2 {
    public static void main(String[] args) {
    char ch1 = 'a';
    char ch2 = 'B';
    char ch3 = 'c';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

      System.out.println("The result for the first character is given as:"+ b1 );
      System.out.println("The result for the second character is given as:"+ b2 );
      System.out.println("The result for the third character is given as:"+ b3 );
     }
}

Output:

The result for the first character is given as:true
The result for the second character is given as:true
The result for the third character is given as:true

Example 3

public class JavaCharacterisJavaLetterOrDigitExample3 {
    public static void main(String[] args) {
    char ch1 = 'a';
    char ch2 = '*';
    char ch3 = '5';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

      System.out.println("The result for the first character is given as:"+ b1 );
      System.out.println("The result for the second character is given as:"+ b2 );
      System.out.println("The result for the third character is given as:"+ b3 );
     }
}

Output:

The result for the first character is given as:true
The result for the second character is given as:false
The result for the third character is given as:true

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