java.lang.Character isDigit(char ch)
Description
A character is a digit if its general category type, provided by Character.getType(ch), is DECIMAL_DIGIT_NUMBER.
Some Unicode character ranges that contain digits:
- ‘u0030’ through ‘u0039’, ISO-LATIN-1 digits (‘0’ through ‘9’)
- ‘u0660’ through ‘u0669’, Arabic-Indic digits
- ‘u06F0’ through ‘u06F9’, Extended Arabic-Indic digits
- ‘u0966’ through ‘u096F’, Devanagari digits
- ‘uFF10’ through ‘uFF19’, Fullwidth digits
Many other character ranges contain digits as well.
Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the isDigit(int) method.
The isDigit(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.isDigit(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 isDigit() method non statically.
Method Syntax
public static boolean isDigit(char ch)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| char | ch | the character to be tested. |
Method Returns
The isDigit(char ch) method of Character class returns true if the character is a digit; false otherwise.
Compatibility
Requires Java 1.0 and up
Java Character isDigit(char ch) Example
Below is a simple java example on the usage of isDigit(char ch) method of Character class.
package com.javatutorialhq.java.examples;
import java.util.Scanner;
/*
* This example source code demonstrates the use of
* isDigit(char ch) method of Character class.
*/
public class CharacterIsDigitCharExample {
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 digit or not
boolean checkBool = Character.isDigit(value);
// print result
if(checkBool){
System.out.print("User input '"+value+"' is a digit");
}
else{
System.out.print("User input '"+value+"' is not a digit");
}
}
}
Sample Output
Below is the sample output when you run the above example.
