Demonstrate encoding with ASCII and UTF-8

foo.java

import java.io.*;

public final class foo {
  public static void main(String[] args) throws Exception {
    byte b[] = {(byte) 0x80, (byte) 0xe3, (byte) 0x81, (byte) 0xbb};
    ByteArrayInputStream is = new ByteArrayInputStream(b);
    Reader r = new InputStreamReader(is, "ASCII");
    System.out.println("ASCII:");
    while (true) {
      int c = r.read();
      if (c == -1) break;
      System.out.println("  " + c);
    }

    is = new ByteArrayInputStream(b);
    r = new InputStreamReader(is, "UTF-8");
    System.out.println("utf-8:");
    while (true) {
      int c = r.read();
      if (c == -1) break;
      System.out.println("  " + c);
    }
  }
}

/* Output:
ASCII:
  65533
  65533
  65533
  65533
utf-8:
  65533
  12411
*/