use CheckBoxMultipleChoice in wicket

 1         final CheckBoxMultipleChoice<String> resultlistChoice = new CheckBoxMultipleChoice<String>("resultlist", new PropertyModel<List<String>>(this, "valueList"), new PropertyModel<List<String>>(this, "list"));

 2 

 3         resultlistChoice.add(new AjaxFormComponentUpdatingBehavior("onclick") {

 4 

 5             @Override

 6             protected void onUpdate(AjaxRequestTarget target) {

 7                 // TODO Auto-generated method stub

 8             }

 9         });

10         

11         resultlistChoice.add(new AjaxFormChoiceComponentUpdatingBehavior() {

12             

13             @Override

14             protected void onUpdate(AjaxRequestTarget target) {

15                 // TODO Auto-generated method stub

16                 selectedList.clear();

17                 for (String item : resultlistChoice.getModelObject()) {

18                     selectedList.add(item);

19                     System.out.println(item);

20                 }

21                 target.add(selectedChoice);

22             }

23         });