I had created a zip file (together with directory) under Windows as follow :

package sandbox;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 *
 * @author yan-cheng.cheok
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // These are the files to include in the ZIP file
        String[] filenames = new String[]{"MyDirectory" + File.separator + "MyFile.txt"};

        // Create a buffer for reading the files
        byte[] buf = new byte[1024];

        try {
            // Create the ZIP file
            String outFilename = "outfile.zip";
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outFilename));

            // Compress the files
            for (int i=0; i<filenames.length; i++) {
                FileInputStream in = new FileInputStream(filenames[i]);

                // Add ZIP entry to output stream.
                out.putNextEntry(new ZipEntry(filenames[i]));

                // Transfer bytes from the file to the ZIP file
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }

                // Complete the entry
                out.closeEntry();
                in.close();
            }

            // Complete the ZIP file
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

The newly created zip file can be extracted without problem under Windows, by using http://www.exampledepot.com/egs/java.util.zip/GetZip.html

However, I realize if I extract the newly created zip file under Linux, using http://www.exampledepot.com/egs/java.util.zip/GetZip.html, I will get a file named

"MyDirectory\MyFile.txt" instead of MyFile.txt being placed under folder MyDirectory.

I try to solve the problem by changing the zip file creation code to

    String[] filenames = new String[]{"MyDirectory" + "/" + "MyFile.txt"};

But, is this an eligible solution, by hard-coded the seperator? Will it work under Mac OS? (I do not have a Mac to try out)