Character.isJavaIdentifierPart() Method in Java with Examples

Last Updated : 06 Dec, 2018

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:

Java

// 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);
    }
}

Output:

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

Program 2:

Java

// 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);
    }
}

Output:

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

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:

Java

// 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);
    }
}

Output:

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

Program 2:

Java

// 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);
    }
}

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)

Twinkl Bajaj

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