java.lang.Character isJavaIdentifierStart(int codePoint)
Description
A character may start a Java identifier if and only if one of the following conditions is true:
- isLetter(ch) returns true
- getType(ch) returns LETTER_NUMBER
- ch is a currency symbol (such as ‘$’)
- ch is a connecting punctuation character (such as ‘_’).
The isJavaIdentifierStart(int codePoint) 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.isJavaIdentifierStart(int codePoint)
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 isJavaIdentifierStart() method non statically.
Method Syntax
public static boolean isJavaIdentifierStart(int codePoint)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| int | codepoint | the character (Unicode code point) to be tested. |
Method Returns
The isJavaIdentifierStart(int codePoint) method of Character class returns true if the character may start a Java identifier; false otherwise.
Compatibility
Requires Java 1.5 and up
Java Character isJavaIdentifierStart(int codePoint) Example
Below is a simple java example on the usage of isJavaIdentifierStart(int codePoint) method of Character class.
package com.javatutorialhq.java.examples;
/*
* This example source code demonstrates the use of
* isJavaIdentifierStart(int codePoint) method of Character class.
*/
public class CharacterIsJavaIdentifierStartCodepointExample {
public static void main(String[] args) {
// initialize a codepoint
int codepoint = 89;
/*
* check if the codepoint is permissible as
* the first character in a Java identifier
*/
boolean checkBool = Character.isJavaIdentifierStart(codepoint);
// print result
if (checkBool) {
System.out.print("Codepoint '" + codepoint + "' is permissible as "
+ "the first character in a Java identifier");
} else {
System.out.print("Codepoint '" + codepoint + "' is not permissible as "
+ "the first character in a Java identifier");
}
}
}
Sample Output
Below is the sample output when you run the above example.
