Java.lang.Character.isDigit() Method



The java.lang.Character.isDigit(int codePoint) determines if the specified character (Unicode code point) is a digit.

A character is a digit if its general category type, provided by getType(codePoint), 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.


Following is the declaration for java.lang.Character.isDigit() method

public static boolean isDigit(int codePoint)


codePoint − the character (Unicode code point) to be tested

Return Value

This method returns true if the character is a digit, false otherwise.




The following example shows the usage of lang.Character.isDigit() method.

package com.tutorialspoint;

import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create 2 int primitives cp1, cp2
      int cp1, cp2;

      // assign values to cp1, cp2
      cp1 = 0x06f8;
      cp2 = 0x0c12;

      // create 2 boolean primitives b1, b2
      boolean b1, b2;

      // assign isDigit results of ch1, ch2 to i1, i2
      b1 = Character.isDigit(cp1);
      b2 = Character.isDigit(cp2);

      String str1 = "cp1 represents a digit is " + b1;
      String str2 = "cp2 represents a digit is " + b2;

      // print b1, b2 values
      System.out.println( str1 );
      System.out.println( str2 );

Let us compile and run the above program, this will produce the following result −

cp1 represents a digit is true
cp2 represents a digit is false