Detect non-ASCII characters in string : Charset « I18N « Java Tutorial

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));

    buffer = decoder.decode(ByteBuffer.wrap(invalidBytes));

13.20.1.Listing All Available Unicode to Character Set Converters
13.20.2.Converting Between Strings (Unicode) and Other Character Set Encodings
13.20.3.encoder and decoder use a supplied ByteBuffer
13.20.4.Detect non-ASCII characters in string
13.20.5.List Charsets
13.20.6.Translate Charset
13.20.7.extends Charset to create Hex Charset