import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Map;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Map<String, String> map = parseQuery("code=0&message=OK&transId=XXXX-XXXX-XXXX&redirect=https%3A%2F%2Fpay1
.comgate.cz%2Finit%3Fid%3DXXXX-XXXX-XXXX");
System.out.println("Code:\n " + map.get("code"));