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

1. Java Tutorial
2. I18N
3. Charset

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()));
  }
}