import org.apache.commons.io.FileUtils;

import net.lingala.zip4j.ZipFile;
import net.lingala.zip4j.io.inputstream.ZipInputStream;
...

public class MainCompact {
   private static final String PW = "test".toCharArray();
   private static final String TESTFOLDER = "testfolder";
   private static final String OUT_ZIP = "out.zip";

   public static void main(String[] args) throws IOException {
      packWithStream(TESTFOLDER);
      unpackWithStream(OUT_ZIP);
   }

   private static void packWithStream(String dirpath) throws IOException {
      var zipParameters = new ZipParameters();
      zipParameters.setCompressionMethod(CompressionMethod.DEFLATE);
      zipParameters.setIncludeRootFolder(false);
      zipParameters.setEncryptFiles(true);
      zipParameters.setEncryptionMethod(EncryptionMethod.AES);

      File[] files = new File(dirpath).listFiles();
      var zipFile = new ZipFile(OUT_ZIP, PW);

      for (File file : files) {
         if (file.isFile()) {
            var zipParametersForFile = new ZipParameters(zipParameters);
            zipParametersForFile.setFileNameInZip(file.getName());
            zipFile.addStream(new ByteArrayInputStream(FileUtils.readFileToByteArray(file)), zipParametersForFile);
         }
      }
   }

   private static void unpackWithStream(String zipFileName) throws IOException {
      LocalFileHeader localFileHeader;
      int readLen;
      var readBuffer = new byte[4096];

      try (var zipInputStream = new ZipInputStream(new FileInputStream(new File(zipFileName)), PW)) {
         while ((localFileHeader = zipInputStream.getNextEntry()) != null) {
            var extractedFile = new File("out/" + localFileHeader.getFileName());
            try (OutputStream outputStream = new FileOutputStream(extractedFile)) {
               while ((readLen = zipInputStream.read(readBuffer)) != -1) {
                  outputStream.write(readBuffer, 0, readLen);
               }
            }
         }
      }
   }
}

   private static void perform(String zipFileName) throws ZipException {
      var zipFile = new ZipFile(zipFileName, PW);
      zipFile.extractAll("out/");
   }