Java.lang.Character.isDefined() Method



The java.lang.Character.isDefined(char ch) determines if a character is defined in Unicode.

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.


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

public static boolean isDefined(char ch)


  • ch - the character to be tested

Return Value

This method returns true if the character has a defined meaning in Unicode, false otherwise.


  • NA


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

package com.tutorialspoint;

import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create a char primitive ch
      char ch;

      // assign value to ch
      ch = '@';

      // create a boolean primitives b
      boolean b;

      // assign isDefined result of ch to b
      b = Character.isDefined(ch);

      String str = "Character " +ch+ " has defined meaning in Unicode is " +b;

      // print b value
      System.out.println( str );

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

Character @ has defined meaning in Unicode is true