Character.isJavaIdentifierStart() in Java

Character.isJavaIdentifierStart(): This method is available in java.lang.Character class of Java.

Approach 1: When the argument of type char.

Syntax:

boolean java.lang.Character.isJavaIdentifierStart(char ch)

This method takes one argument of type char as its parameter. This method determines if the specified character is permissible as the first character in a Java identifier.

Note:

1. ch is a currency symbol (such as '$').

2. ch is a connecting punctuation character (such as '_').

Parameters: One parameter is required for this method.

ch: the character to be tested.

Returns: true if the character may start a Java identifier; false otherwise.

Exceptions: NA

Java

public class CharacterisJavaIdentifierStartchar {
    public static void main(String[] args) {

        char ch = 'a';
        System.out.println(Character.isJavaIdentifierStart(ch));
    }
}

Output:

true

Approach 2: When the argument of type int.

Syntax:

boolean java.lang.Character.isJavaIdentifierStart(int codePoint)

This method takes one argument of type int as its parameter. This method determines if the character (Unicode code point) is permissible as the first character in a Java identifier.

Note:

1. The referenced character is a currency symbol (such as '$').

2. The referenced character is a connecting punctuation character(such as '_').

Parameters: codePoint the character (Unicode code point) to be tested.

Returns: true if the character may start a Java identifier; false otherwise.

Exceptions: NA

Java

public class CharacterisJavaIdentifierStartint {
    public static void main(String[] args) {

        int codePoint = '_';
        System.out.println(Character.isJavaIdentifierStart(codePoint));
    }
}

Output:

true