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    <p>I did a demo and unit test for you, currently I use java.util.Date to substitute your SomeDate class .</p> <p><strong>update:</strong> 2013-12-31 </p> <p>I am not trying to make things complex,but I really feel it is my responsibility to not mislead others,so I try to fixed the code again.Currently, HashMap can't be append,please improve it.Thanks!</p> <p>this code refactored from your code:</p> <pre><code>import java.io.*; import java.util.*; /** * refactored by your code * append object stream haven't realized,please help * 2013-12-31 */ public class Reminder implements Serializable { public static void main(String[] args) { //do some initialization Reminder re = new Reminder(); re.put(new Date(System.currentTimeMillis()), "Hope it work!"); re.put(new Date(System.currentTimeMillis()+100), "it work!"); re.put(new Date(System.currentTimeMillis()+200), "Wake up!"); //save to file ,using append mode String filpath = "/tmp/reminder.ser"; re.save(filpath,true); //load from file and iterate the key-value pair Reminder reLoad = Reminder.Load(filpath); if(reLoad != null) { Iterator&lt;Map.Entry&lt;Date,String&gt;&gt; it = reLoad.entrySet().iterator(); while(it.hasNext()) { Map.Entry&lt;Date,String&gt; entry = it.next(); System.out.format("reminder: %tc---%s%n",entry.getKey(),entry.getValue()); } } } public Set&lt;Map.Entry&lt;Date,String&gt;&gt; entrySet() { return reminderMap.entrySet(); } public void put(Date chosenDate, String string) { reminderMap.put(chosenDate, string); } public String get(Date chosenDate) { return reminderMap.get(chosenDate); } /** * serializing an object * @param filePath path to save file * @param append indicate whether append or not */ public void save(String filePath,boolean append){ System.out.println("Trying to save"); try { ObjectOutputStream out = new ObjectOutputStream ( new FileOutputStream(filePath,append)); out.writeObject(this); out.close(); System.out.printf("Serialized data is saved in "+filePath); }catch(IOException e) { e.printStackTrace(); } } /** * deserialize ,load from file and rebuild object * @param filePath the path from where to load * @return a new Object */ public static Reminder Load(String filePath) { System.out.println("Trying to load"); Reminder reminder = null; try { ObjectInputStream in = new ObjectInputStream (new FileInputStream(filePath)); reminder = (Reminder) in.readObject(); in.close(); }catch(IOException | ClassNotFoundException e) { e.printStackTrace(); } return reminder; } private static final long serialVersionUID = 1L; private Map&lt;Date,String&gt; reminderMap = new HashMap&lt;&gt;(); } </code></pre>
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    1. COThank you! You are awesome.
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