Character.isJavaIdentifierPart() Method in Java with Examples

  1. The Character.isJavaIdentifierPart(int codePoint) is an inbuilt method in java that determines if the specified character may be part of a Java identifier as other than the first character.
    A character may be a part of Java identifier if any of the following are true:

    • it is a letter
    • it is a currency symbol (such as ‘$’)
    • it is a connecting punctuation character (such as ‘_’)
    • it is a digit
    • it is a numeric letter (such as a Roman numeral character)
    • it is a combining mark
    • it is a non-spacing mark
    • isIdentifierIgnorable returns true for the character.

    Syntax:

    public static boolean isJavaIdentifierPart(int codePoint)

    Parameters: The parameter codePoint of Integer datatype refers to the character (Unicode code point) that is to be tested.



    Return Value: The isJavaIdentifierPart(int codepoint) method of Character class returns true if the character may be part of a Java identifier; false otherwise.

    Below programs are used to illustrate the Character.isJavaIdentifierPart(int codepoint) method:
    Program 1:

    filter_none

    edit
    close

    play_arrow

    link
    brightness_4
    code

    // Java program to illustrate
    // Character.isJavaIdentifierPart() method
    import java.lang.*;
      
    public class gfg {
      
        public static void main(String[] args)
        {
      
            // Create 2 int primitives c1, c2
            int c1 = 0x01f2, c2 = 0x78c0;
      
            // Assign isJavaIdentifierPart results of c1, c2
            // to boolean primitives bool1, bool2
            boolean bool1 = Character.isJavaIdentifierPart(c1);
            boolean bool2 = Character.isJavaIdentifierPart(c2);
      
            String str1 = "c1 may be part of a Java identifier is " + bool1;
            String str2 = "c2 may be part of a Java identifier is " + bool2;
      
            System.out.println(str1);
            System.out.println(str2);
        }
    }

    chevron_right

    
    

    Output:

    c1 may be part of a Java identifier is true
    c2 may be part of a Java identifier is true
    

    Program 2:

    filter_none

    edit
    close

    play_arrow

    link
    brightness_4
    code

    // Java program to illustrate
    // Character.isJavaIdentifierPart(int codepoint) method
    import java.lang.*;
      
    public class gfg {
      
        public static void main(String[] args)
        {
      
            // Create 2 int primitives c1, c2
            int c1 = 0x85f1, c2 = 0x95c0;
      
            // Assign isJavaIdentifierPart results of c1, c2
            // to boolean primitives bool1, bool2
            boolean bool1 = Character.isJavaIdentifierPart(c1);
            boolean bool2 = Character.isJavaIdentifierPart(c2);
      
            String str1 = "c1 may be part of a Java identifier is " + bool1;
            String str2 = "c2 may be part of a Java identifier is " + bool2;
      
            // Print b1, b2 values
            System.out.println(str1);
            System.out.println(str2);
        }
    }

    chevron_right

    
    

    Output:

    c1 may be part of a Java identifier is true
    c2 may be part of a Java identifier is true
    
  2. The Character.isJavaIdentifierPart(char ch) is similar to the previous method in all manner but cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the previous method.

    Syntax:

    public static boolean isJavaIdentifierPart(char ch)

    Parameters:The parameter ch is of character datatype and refers to the character that is to be tested.

    Return Value: The isJavaIdentifierPart(char ch) method of Character class returns true if the character may be part of a Java identifier; false otherwise.

    Below programs are used to illustrate the use Character.isJavaIdentifierPart(char ch) method:
    Program 1:

    filter_none

    edit
    close

    play_arrow

    link
    brightness_4
    code

    // Java program to illustrate
    // Character.isJavaIdentifierPart(char ch) method
    import java.lang.*;
      
    public class gfg {
      
        public static void main(String[] args)
        {
      
            // Create 2 char primitives c1, c2 and assign values
            char c1 = '5', c2 = '%';
      
            // Assign isJavaIdentifierPart results of 
            //c1, c2 to boolean primitives bool1, bool2
            boolean bool1 = Character.isJavaIdentifierPart(c1);
            boolean bool2 = Character.isJavaIdentifierPart(c2);
      
            String str1 = c1 + " may be part of a Java identifier is " + bool1;
            String str2 = c2 + " may be part of a Java identifier is " + bool2;
      
            // Print bool1, bool2 values
            System.out.println(str1);
            System.out.println(str2);
        }
    }

    chevron_right

    
    

    Output:

    5 may be part of a Java identifier is true
    % may be part of a Java identifier is false
    

    Program 2:

    filter_none

    edit
    close

    play_arrow

    link
    brightness_4
    code

    // Java program to illustrate
    // Character.isJavaIdentifierPart(char ch) method
    import java.lang.*;
      
    public class gfg {
      
        public static void main(String[] args)
        {
      
            // Create 2 char primitives c1, c2 and assign values
            char c1 = '6', c2 = '*';
      
            // assign isJavaIdentifierPart results of 
            //c1, c2 to boolean primitives bool1, bool2
            boolean bool1 = Character.isJavaIdentifierPart(c1);
            boolean bool2 = Character.isJavaIdentifierPart(c2);
      
            String str1 = c1 + " may be part of a Java identifier is " + bool1;
            String str2 = c2 + " may be part of a Java identifier is " + bool2;
      
            // Print bool1, bool2 values
            System.out.println(str1);
            System.out.println(str2);
        }
    }

    chevron_right

    
    

    Output:

    6 may be part of a Java identifier is true
    * may be part of a Java identifier is false
    

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



My Personal Notes arrow_drop_up

Contented with little yet wishing for more

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.