Charset isRegistered() method in Java with Examples

Namachila November 8, 2025

0 1 1 minute read

The isRegistered() method is a built-in method of the java.nio.charset checks if a given charset is registered or not under the IANA Charset Registry.

Syntax:

public final boolean isRegistered()

Parameters: The function does not accepts any parameter.

Return Value: The function returns a boolean value. It returns true if it is registered, else it returns false.

Below is the implementation of the above function:

Program 1:

// Java program to demonstrate
// the above function
  
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Generate the Charset
        Charset first
            = Charset.forName("ISO-2022-CN");
  
        // Check if this Charset is registered
        System.out.println(first.isRegistered());
    }
}

Output:

true

Program 2:

// Java program to demonstrate
// the above function
  
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Generate the Charset
        Charset second
            = Charset.forName("x-windows-949");
  
        // Check if this Charset is registered
        System.out.println(second.isRegistered());
    }
}