How to retrieve a folder inside a zip file?

There is a zip file which contains a folder inside it. The folder itself contains a few files. I would need to know how to extract the folder (with its contents) from inside a zip file.

I have found a few unzipping code samples which show how to handle a folder inside a zip file. An example is shown below:

Code:

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public static void extract(String workingDirectory, byte[] zipFile)
throws Exception {
       
ByteArrayInputStream byteStream = new ByteArrayInputStream(zipFile);
ByteArrayOutputStream out = new ByteArrayOutputStream();
       
ZipInputStream zipStream = new ZipInputStream(byteStream);
ZipEntry zipEntry = null;
       
String nameZipEntry = null;
       
byte[] contentZipEntry = null;
boolean isDirectory = false;
       
 int indexFileSeparator = -1;
String directory = null;
String fileName =  null;
       
while ( (zipEntry = zipStream.getNextEntry()) != null )
{
            nameZipEntry = workingDirectory + File.separator + zipEntry.getName();
           
            isDirectory = zipEntry.isDirectory();
           
            if (isDirectory) {
                File file = new File(nameZipEntry);
                file.mkdirs();
            }
            else
              {
               
                // read zipEntry
                byte[] buf = new byte[1024];
                int c = 0;
               
                while ( (c = zipStream.read(buf)) != -1)
                {
                    out.write(buf, 0, c);
                }
               
                indexFileSeparator = nameZipEntry.lastIndexOf(File.separator);
                directory = nameZipEntry.substring(0, indexFileSeparator);
                fileName =  nameZipEntry.substring(indexFileSeparator+1,nameZipEntry.length());
               
                FileSystemTools.createFile(directory, fileName, out);
               
                out.reset();
                zipStream.closeEntry();
            }
        }

        zipStream.close();
        byteStream.close();
 }

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The code sample which deals with the part where the zipEntry is a directory creates a directory with the same path and name. (highlighted in bold)

Another similar variation is:

Code:

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File file = new File(dirDestiny.getAbsolutePath() + File.separator + zipEntry.getName() );
           
if(zipEntry.isDirectory())
      file.mkdirs();

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When the code creates a directory for the folder, does it unzip the contents inside the folder as well?

If not, how do I extract the files inside the folder?