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 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);        }    }} |
CharsetDecoder: sun.nio.cs.ISO_8859_1$Decoder@232204a1 java.lang.UnsupportedOperationException
Program 2:
// Java program to demonstrate// the above function  import java.nio.charset.*;import java.util.Iterator;import java.util.Map;  public class GFG {      public static void main(String[] args)    {          // Gets the charset        Charset charset = Charset.forName("x-windows-949");          // Get the CharsetDecoder        CharsetDecoder decoder = charset.newDecoder();          // Prints the CharsetDecoder        System.out.println("CharsetDecoder: " + decoder);          try {            System.out.println("Is Charset yet detected: "                               + decoder.isCharsetDetected());        }        catch (Exception e) {            System.out.println(e);        }    }} |
CharsetDecoder: sun.nio.cs.ext.DoubleByte$Decoder@232204a1 java.lang.UnsupportedOperationException
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/charset/CharsetDecoder.html#isCharsetDetected–
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