(Java) Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number.

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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.

    CkImap imap = new CkImap();

    // Connect to an IMAP server.
    // Use TLS
    imap.put_Ssl(true);
    imap.put_Port(993);
    boolean success = imap.Connect("mail.testemail.net");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Login
    success = imap.Login("***","***");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        System.out.println(imap.lastErrorText());
        return;
        }

    // After selecting a mailbox, the NumMessages property
    // contains the number of emails in the selected mailbox.
    int n;
    n = imap.get_NumMessages();

    if (n > 0) {

        // The oldest email is always at sequence number 1.
        boolean isUid = false;

        CkEmail oldestEmail;
        oldestEmail = imap.FetchSingle(1,isUid);
        if (imap.get_LastMethodSuccess() == true) {

            // Display the From and Subject
            System.out.println(oldestEmail.fromAddress());
            System.out.println(oldestEmail.subject());

            System.out.println("--");

            }

        // The newest email is at sequence number N:
        CkEmail newestEmail;
        newestEmail = imap.FetchSingle(n,isUid);
        if (imap.get_LastMethodSuccess() == true) {

            // Display the From and Subject
            System.out.println(newestEmail.fromAddress());
            System.out.println(newestEmail.subject());

            }

        }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();
  }
}