import org.apache.commons.codec.binary.Base64;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
String hello = "aaaaaaaa";
byte[] decoded = Base64.decodeBase64(hello.getBytes());
System.out.println(Arrays.toString(decoded));
String decodedString = new String(decoded);
System.out.println(hello + " = " + decodedString);
}
}