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import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.Arrays;
public class Main {
public static void main(String[] args) throws Exception {
byte[] invalidBytes = "© ".getBytes();
byte[] validBytes = "(c)".getBytes();
CharsetDecoder decoder = Charset.forName("US-ASCII").newDecoder();
CharBuffer buffer = decoder.decode(ByteBuffer.wrap(validBytes));
System.out.println(Arrays.toString(buffer.array()));
buffer = decoder.decode(ByteBuffer.wrap(invalidBytes));
System.out.println(Arrays.toString(buffer.array()));
}
}
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