Java Character isDefined() Method

The isDefined(char ch) method of Character class generally determines whether the character is defined in the Unicode or not.

A character is defined in Unicode if and only if any of the two conditions are satisfied(or true):

The character must have an entry made in the UnicodeData file.
The character must have a range which is defined by the UnicodeData file.

Syntax

Parameter

The above method requires only one parameter:

a.) The character that needs to be tested.

Return Value

The isDefined(char ch) method returns a Boolean value i.e. true, if the given(or specified) character is given with a defined meaning in the Unicode. Otherwise, it returns false.

Example 1

public class JavaCharacterisDefinedExample1 {
	public static void main(String[] args) {
	      // Create char primitives obj1, obj2 and obj3
	      char obj1;
	      char obj2;
	      char obj3;
	      // Assign the values to obj1, obj2 and obj3.
	      obj1 = '@';
	      obj2 = '*';
	      obj3 = '&';
	      // Create the boolean primitives b1, b2,b3.
	      boolean b1;
	      boolean b2;
	      boolean b3;
	      b1 = Character.isDefined(obj1);
	      b2 = Character.isDefined(obj2);
	      b3 = Character.isDefined(obj3);
	      String str1 = "The meaning for the character " +obj1+ " is defined as:  " +b1;
	      String str2 = "The meaning for the character " +obj2+ " is defined as:  " +b2;
	      String str3 = "The meaning for the character " +obj3+ " is defined as:   " +b3;
	      // print b value
	      System.out.println( str1 );
	      System.out.println( str2 );
	      System.out.println( str3 );
	   }
	}

Test it Now

Output:

The meaning for the character @ is defined as:  true
The meaning for the character * is defined as:  true
The meaning for the character & is defined as:  true

Example 2

import java.util.Scanner;
public class JavaCharacterisDefinedExample2 {
public static void main(String[] args) {
     // Ask the user to enter the first character.
	System.out.print("Enter a character:   ");		
    // Use scanner to get the user input
	Scanner obj1 = new Scanner(System.in);
   // get a single character
	char value1 = obj1.nextLine().toCharArray()[0];
		
    // Check whether the user input is defined the Unicode or not.
	boolean check1 = Character.isDefined(value1);
   // Print the result
	if(check1){
System.out.print("The user input \'"+value1+"\' is defined in the Unicode\n");
		}
	else{
System.out.print("The user input \'"+value1+"\' is not defined in the Unicode\n");
		}
   // Ask the user to enter the second character.
System.out.print("Enter the second character:   ");				
  // Use scanner to get the user input
    Scanner obj2 = new Scanner(System.in);
  // get a single character
    char value2 = obj2.nextLine().toCharArray()[0];			
  // Check whether the user input is defined the Unicode or not. 
    boolean check2 = Character.isDefined(value2);
  // Print the result
     if(check2){
System.out.print("The user input \'"+value2+"\' is defined in the Unicode");
	   }
     else{
System.out.print("The user input \'"+value2+"\' is not defined in the Unicode");
		}		
       }
}

Test it Now

Output:

Enter a character:   $
The user input '$' is defined in the Unicode
Enter the second character:   )
The user input ')' is defined in the Unicode

Example 3

public class JavaCharacterisDefinedExample3 {
	public static void main(String args[])
	  {
	   char ch1 = '1';
	   char ch2 = '2';    
	   char ch3 = '3';    
	   char ch4 = '4';    
	   char ch5 = '5';   
	   boolean b1 = Character.isDefined(ch1);
	   boolean b2 = Character.isDefined(ch2);
	   boolean b3 = Character.isDefined(ch3);
	   boolean b4 = Character.isDefined(ch4);
	   boolean b5 = Character.isDefined(ch5);
System.out.println(ch1 + " is defined in the Unicode character set: " + b1);              
System.out.println(ch2 + " is defined in the Unicode character set: " + b2);  
System.out.println(ch3 + " is defined in the Unicode character set: " + b3);  
System.out.println(ch4 + " is defined in the Unicode character set: " + b4);   
System.out.println(ch5 + " is defined in the Unicode character set: " + b5); 
     	}
}

Test it Now

Output:

1 is defined in the Unicode character set: true
2 is defined in the Unicode character set: true
3 is defined in the Unicode character set: true
4 is defined in the Unicode character set: true
5 is defined in the Unicode character set: true

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Java Character Class

Java Character isDefined() Method

Syntax

Parameter

Return Value

Example 1

Example 2

Example 3

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