CharsetDecoder isCharsetDetected() method in Java with Examples

The isCharsetDetected() method is a built-in method of the java.nio.charset.CharsetDecoder class which tells whether or not this decoder has yet detected a charset. The default implementation of this method always throws an UnsupportedOperationException. It should be overridden by auto-detecting decoders to return true once the input charset has been determined.

Syntax:

public boolean isCharsetDetected()

Parameters: The function does not accepts any parameter.

Return Value: The function returns a boolean value stating if this CharsetDecoder has yet detected a charset.

Exception: It throws UnsupportedOperationException if this decoder does not implement an auto-detecting charset

Below is the implementation of the above function:

Program 1:

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// Java program to demonstrate
// the above function
  
import java.nio.charset.*;
import java.util.Iterator;
import java.util.Map;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Gets the charset
        Charset charset = Charset.forName("ISO-8859-1");
  
        // Get the CharsetDecoder
        CharsetDecoder decoder = charset.newDecoder();
  
        // Prints the CharsetDecoder
        System.out.println("CharsetDecoder: " + decoder);
  
        try {
            System.out.println("Is Charset yet detected: "
                               + decoder.isCharsetDetected());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

CharsetDecoder: sun.nio.cs.ISO_8859_1$Decoder@232204a1
java.lang.UnsupportedOperationException

Program 2:

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// Java program to demonstrate
// the above function
  
import java.nio.charset.*;
import java.util.Iterator;
import java.util.Map;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Gets the charset
        Charset charset = Charset.forName("x-windows-949");
  
        // Get the CharsetDecoder
        CharsetDecoder decoder = charset.newDecoder();
  
        // Prints the CharsetDecoder
        System.out.println("CharsetDecoder: " + decoder);
  
        try {
            System.out.println("Is Charset yet detected: "
                               + decoder.isCharsetDetected());
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

CharsetDecoder: sun.nio.cs.ext.DoubleByte$Decoder@232204a1
java.lang.UnsupportedOperationException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/charset/CharsetDecoder.html#isCharsetDetected–



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