(Java) List Files/Directories in Zip by Index

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Demonstrates how to iterate over the files and directories in a zip archive by index.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkZip zip = new CkZip();

    boolean success = zip.OpenZip("qa_data/zips/sample.zip");
    if (success != true) {
        System.out.println(zip.lastErrorText());
        return;
        }

    int numEntries = zip.get_NumEntries();
    int i = 0;

    CkZipEntry entry;

    while (i < numEntries) {
        entry = zip.GetEntryByIndex(i);
        // Note: In the ZIP file format, it is not required for a ZIP file to contain explicit directory entries. 
        // However, explicit directory entries can be included for convenience and compatibility with certain ZIP file processing tools and software.
        // An explicit directory entry in a ZIP file is an entry that specifically represents a directory, rather than a file. 
        // It usually has a directory name with a trailing slash (/) and zero-length content.
        if (entry.get_IsDirectory()) {
            System.out.println(i + ": " + entry.fileName() + " (directory)");
            }
        else {
            System.out.println(i + ": " + entry.fileName());
            }

        i = i+1;
        }

    // Sample output:

    // 0: aaa/ (directory)
    // 1: aaa/pigs.json
    // 2: bbb/ (directory)
    // 3: bbb/base64Cert.txt
    // 4: bbb/sub1/ (directory)
    // 5: bbb/sub1/brasil_cert.pem
    // 6: bbb/sub2/ (directory)
    // 7: bbb/sub2/penguins.gif
    // 8: bbb/sub2/starfish.jpg
    // 9: hamlet.xml
    // 10: hello.pdf

    zip.CloseZip();
  }
}