use CheckBoxMultipleChoice in wicket

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

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

            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                // TODO Auto-generated method stub
            }
        });
        
        resultlistChoice.add(new AjaxFormChoiceComponentUpdatingBehavior() {
            
            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                // TODO Auto-generated method stub
                selectedList.clear();
                for (String item : resultlistChoice.getModelObject()) {
                    selectedList.add(item);
                    System.out.println(item);
                }
                target.add(selectedChoice);
            }
        });