java.lang.Character isDefined(char ch)
Description
A character is defined if at least one of the following is true:
- It has an entry in the UnicodeData file.
- It has a value in a range defined by the UnicodeData file.
This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isDefined(int) method.
The isDefined(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.isDefined(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 isDefined() method non statically.
Method Syntax
public static boolean isDefined(char ch)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| char | ch | the character to be tested |
Method Returns
The isDefined(char ch) method of Character class returns true if the character has a defined meaning in Unicode; false otherwise.
Compatibility
Requires Java 1.0.2 and up
Java Character isDefined(char ch) Example
Below is a simple java example on the usage of isDefined(char ch) method of Character class.
package com.javatutorialhq.java.examples;
import java.util.Scanner;
/*
* This example source code demonstrates the use of
* isDefined(char ch) method of Character class.
*/
public class CharacterIsDefinedCharExample {
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 user input is defined in Unicode
boolean checkBool = Character.isDefined(value);
// print result
if(checkBool){
System.out.print("User input '"+value+"' is defined in Unicode");
}
else{
System.out.print("User input '"+value+"' is defined in Unicode");
}
}
}
Sample Output
Below is the sample output when you run the above example.
