Character.isUnicodeIdentifierPart() Method in Java with Examples

The java.lang.Character.isUnicodeIdentifierPart() is an inbuilt method in java that determines if the specified character may be part of a Unicode identifier as other than the first character.

A character may be part of a Unicode identifier if and only if one of the following statements is true:

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

Syntax:

public static boolean isUnicodeIdentifierPart(datatype character)

Parameter: The function accepts one mandatory parameter character. This parameter can be of datatype int or char. It specifies the character to be tested.

Return Value: This method returns true if the character may be part of a Unicode identifier, otherwise false.

Below programs illustrate the java.lang.Character.isUnicodeIdentifierPart() method:
Program 1: When the passed parameter is a Character.

// Code to illustrate the Character.isUnicodeIdentifierPart()
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // Creating character primitives
        char char1 = '-';
        char char2 = '7';
        char char3 = 'g';

        boolean bool1 = Character.isUnicodeIdentifierPart(char1);
        boolean bool2 = Character.isUnicodeIdentifierPart(char2);
        boolean bool3 = Character.isUnicodeIdentifierPart(char3);

        String str1 = " Is " + char1 + " a part of Unicode Identifier: " + bool1;
        String str2 = " Is " + char2 + " a part of Unicode Identifier: " + bool2;
        String str3 = " Is " + char3 + " a part of Unicode Identifier: " + bool3;

                // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
        System.out.println(str3);
    }
}

Output:

Is - a part of Unicode Identifier: false
 Is 7 a part of Unicode Identifier: true
 Is g a part of Unicode Identifier: true

Program 2: When the passed parameter is a Character.

// Code to illustrate the Character.isUnicodeIdentifierPart()
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // Create 2 char primitives c1, c2
        char c1 = '~', c2 = '8';

        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);

        String str1 = c1 + " may be part of a Unicode identifier is " + bool1;
        String str2 = c2 + " may be part of a Unicode identifier is " + bool2;

        System.out.println(str1);
        System.out.println(str2);
    }
}

Output:

~ may be part of a Unicode identifier is false
8 may be part of a Unicode identifier is true

Below programs illustrate the Character.isUnicodeIdentifierPart(int codePoint) method:

Program 1:

// Code to illustrate the Character.isUnicodeIdentifierPart(int codePoint)
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // Create 2 int primitives c1, c2
        int c1 = 0x053d, c2 = 0x7840;

        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);

        String str1 = "c1 may be part of a Unicode identifier is " + bool1;
        String str2 = "c2 may be part of a Unicode identifier is " + bool2;

        // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
    }
}

Output:

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

Program 2:

// Code to illustrate the Character.isUnicodeIdentifierPart(int codePoint)
import java.lang.*;

public class gfg {

    public static void main(String[] args)
    {

        // Creating 2 int primitives c1, c2
        int c1 = 0x065d, c2 = 0x7885;

        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);

        String str1 = "c1 may be part of a Unicode identifier is " + bool1;
        String str2 = "c2 may be part of a Unicode identifier is " + bool2;

        // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
    }
}

Output:

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

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