当我收到邮件时，打开收件箱，然后收到邮件；如何将它们与以前的消息数组进行比较，以使我知道已经阅读了其中的哪些消息？
Properties properties = new Properties();
properties.put("mail.imaps.host", host);
properties.put("mail.imaps.port", "993");
Session emailSession = Session.getDefaultInstance(properties);
//2) create the POP3 store object and connect with the pop server
Store emailStore = emailSession.getStore("imaps");
emailStore.connect(user,pw);
//3) create the folder object and open it
Folder emailFolder = emailStore.getFolder("INBOX");
emailFolder.open(Folder.READ_ONLY);
Message[] messages = emailFolder.getMessages();
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