(Java) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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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[])
  {
    boolean success = false;

    CkZip zip = new CkZip();

    // Open an existing ZIP archive.
    success = zip.OpenZip("c:/temp/example.zip");
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    // A ZIP archive may contain zero entries.
    if (zip.get_NumEntries() == 0) {

        System.out.println("The ZIP archive is empty.");

        zip.CloseZip();
        return;
        }

    // ------------------------------------------------------------
    // Get the first ZIP entry.
    // 
    // EntryAt(0,entry) initializes the ZipEntry object so that
    // it represents the first entry in the ZIP archive.
    // 
    CkZipEntry entry = new CkZipEntry();

    success = zip.EntryAt(0,entry);
    if (success == false) {
        System.out.println(zip.lastErrorText());
        return;
        }

    // ------------------------------------------------------------
    // Iterate through all ZIP entries.
    // 
    // GetNext updates the same ZipEntry object so that it
    // represents the next entry in the ZIP archive.
    // 
    while ((success == true)) {

        if (entry.get_IsDirectory() == true) {

            System.out.println("[Directory] " + entry.fileName());

            }
        else {

            System.out.println("[File] " + entry.fileName());
            }

        // Advance to the next entry.
        success = entry.GetNext();
        }

    zip.CloseZip();

    System.out.println("Done.");
  }
}