The following example from Displaying Components for Selecting Multiple Values shows how to use the h:selectManyCheckbox tag:
<h:selectManyCheckbox id="newsletters" layout="pageDirection" value="#{cashier.newsletters}"> <f:selectItems value="#{newsletters}"/> </h:selectManyCheckbox>
The value attribute of the f:selectItems tag is bound to the backing bean newsletters.
You can also create the list of items programmatically in the backing bean. See Writing Bean Properties for information on how to write a backing bean property for one of these tags.