java.lang.Character isUnicodeIdentifierStart(char ch)
Description
A character may start a Unicode identifier if and only if one of the following conditions is true:
- isLetter(ch) returns true
- getType(ch) returns LETTER_NUMBER.
This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isUnicodeIdentifierStart(int) method.
The isUnicodeIdentifierStart(char ch) method of Character class is static thus it should be accessed statically which means the we would be calling this method in this format:
Character.isUnicodeIdentifierStart(char ch)
Non static method is usually called by just declaring method_name(argument) however in this case since the method is static, it should be called by appending the class name as suffix. We will be encountering a compilation problem if we call the java isUnicodeIdentifierStart() method non statically.
Method Syntax
public static boolean isUnicodeIdentifierStart(char ch)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| char | ch | the character to be tested. |
Method Returns
The isUnicodeIdentifierStart(char ch) method of Character class returns true if the character may start a Unicode identifier; false otherwise.
Compatibility
Requires Java 1.1 and up
Java Character isUnicodeIdentifierStart(char ch) Example
Below is a simple java example on the usage of isUnicodeIdentifierStart(char ch) method of Character class.
package com.javatutorialhq.java.examples;
import java.util.Scanner;
/*
* This example source code demonstrates the use of
* isUnicodeIdentifierStart(char ch) method of Character class.
*/
public class CharacterIsUnicodeIdentifierStartCharExample {
public static void main(String[] args) {
// Ask for user input
System.out.print("Enter a character:");
// use scanner to get the user input
Scanner s = new Scanner(System.in);
// get a single character
char value = s.nextLine().toCharArray()[0];
// close the scanner object
s.close();
/*
* check if the specified character is permissible as the
* first character in a Unicode identifier.
*/
boolean checkBool = Character.isUnicodeIdentifierStart(value);
// print result
if (checkBool) {
System.out.print("User input '" + value + "' is permissible as the "
+ "first character in a Unicode identifier");
} else {
System.out.print("User input '" + value + "' is not permissible as the "
+ "first character in a Unicode identifier");
}
}
}
Sample Output
Below is the sample output when you run the above example.
