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.

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// 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);
    }
}

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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.

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// 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);
    }
}

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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:

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// 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);
    }
}

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Output:

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

Program 2:

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// 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);
    }
}

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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)

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