CharsetDecoder isCharsetDetected() method in Java with Examples

Last Updated : 27 Jun, 2019
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: Java 
// 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);
        }
    }
}
Output: 
CharsetDecoder: sun.nio.cs.ISO_8859_1$Decoder@232204a1
java.lang.UnsupportedOperationException
Program 2: Java 
// 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);
        }
    }
}
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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