java ee - How to add a ItemSorter to a table container in Vaadin? -

i have container class extends beanitemcontainer. want add itemsorter date_created attribute sort values in descending order.

container class.

public class notecontainer extends beanitemcontainer<casenote> implements serializable {     private static final long serialversionuid = -5926608449530066014l;      public static final string date_created = "datecreated";     public static final string created_by = "createdby";     public static final string text = "text";     public static final string action = "action";      public static final object[] natural_col_order = new object[] {         action, date_created, created_by, text      };      public static final string[] col_headers_english = new string[] {         "action", "date created/updated", "created/updated by", "note"     };      /**      * default constructor.      *       */     public notecontainer()     {         super(casenote.class);     } } 

casenote entity class, , inside date_created in java.util.date format.

please provide proper solution...

related sort vaadin table

thanx in advance.

beanitemcontainer has prepared set itemsorter easily. can use function:

public void sort(object[] propertyid, boolean[] ascending) 

so example can add sortbydate() function container this. here 3 example classes.

the bean:

public class casenote { private static final random r = new random(); private static final long y_in_millies = 1000l * 60l * 60l * 24l * 365l; private date datecreated = new date(system.currenttimemillis() - math.round(r.nextdouble() * y_in_millies));  private string text = uuid.randomuuid().tostring();  public string gettext() {     return text; }  public date getdatecreated() {     return datecreated; } } 

the container:

public class notecontainer extends beanitemcontainer<casenote> {  public notecontainer() {     super(casenote.class); }  public void sortbydate() {     sort(new string[] { "datecreated" }, new boolean[] { false }); } } 

the test ui:

public class testui extends ui {  @override protected void init(vaadinrequest request) {     notecontainer nc = new notecontainer();     (int = 0; < 10; i++) {         nc.additem(new casenote());     }     nc.sortbydate();      (int = 0; < 10; i++) {         nc.additem(new casenote());     }      table t = new table("mytable", nc);     setcontent(t); } } 

note: items added after calling sortbydate() function not sorted. if want have items sorted after every insert, overwrite additem() functions, call sort() after adding item.