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Java Character isDigit(int codePoint) Method

isDigit(int codePoint) method is a part of Character class. This method checks whether the specified Unicode codepoint character is a digit or not. A character is defined as a digit if its general category type provided by Character.getType(ch) is a DECIMAL_DIGIT_NUMBER.

Some Unicode ranges that comprise the digits are:

  • '\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.

Syntax:

public static boolean isDigit(int codePoint)  

Parameter:

The parameter passed is the Unicode codepoint character value to be checked whether it is a digit or not.

Returns:

Returns the boolean value true if the specified character is a digit else return false.

Example 1:

Here, the codepoints are checked by using the isDigit() method whether they are digits or not.

public class StudyTonight
{  
	public static void main(String[] args)
	{  
		int cp1 = 88;  
		int cp2 = 34;  
		int cp3 = 50;  
		int cp4  = 83;   
		int cp5  = 55;  

		boolean b1 = Character.isDigit(cp1);  
		boolean b2 = Character.isDigit(cp2);  
		boolean b3 = Character.isDigit(cp3);  
		boolean b4 = Character.isDigit(cp4);  
		boolean b5 = Character.isDigit(cp5);  

		System.out.println((char)cp1 +" is a digit??:  "+b1);  
		System.out.println((char)cp2 +" is a digit??:  "+b2);  
		System.out.println((char)cp3 +" is a digit??:  "+b3);  
		System.out.println((char)cp4 +" is a digit?? : "+b4);  
		System.out.println((char)cp5 +" is a digit??:  "+b5);  
	}  
}  


X is a digit??: false
" is a digit??: false
2 is a digit??: true
S is a digit?? : false
7 is a digit??: true

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent output.

import java.util.Scanner; 
public class StudyTonight
{  
	public static void main(String[] args)
	{  
		try
		{
			System.out.print("Enter the codepoint: ");  
			Scanner sc = new Scanner(System.in);         
			int cp = sc.nextInt();  
			boolean b = Character.isDigit(cp);
			System.out.println((char)cp + " is a digit?? : "+b);
		}
		catch(Exception e)
		{
			System.out.println("Invalid Input!!");
		}
	}  
}  


Enter the codepoint: 54
6 is a digit?? : true
*****************************
Enter the codepoint: 66
B is a digit?? : false

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.