Character.isJavaIdentifierStart() method in Java

The java.lang.Character.isJavaIdentifierStart(char ch) is an inbuilt method in java which determines if the specified character is permissible as the first character in a Java identifier or not. A character may start as 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 ‘_’).

Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isJavaIdentifierStart(int) method. Syntax:

public static boolean isJavaIdentifierStart(char ch)

Parameters: The function accepts one mandatory parameter ch which specifies the character to be tested. Return value: This method returns a boolean value. The boolean value is True if the character may start a Java identifier, False otherwise. Program below demonstrates the Character.isJavaIdentifierStart(char ch) method: Program 1: Program 2:

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isJavaIdentifierStart(char)