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); } }