stored checkbox values not checked when trying to edit

In the main page,I click on the below checkboxes to store the values in a arraylist 'Method'. After saving, When i try to edit the main page, how to display the respective checkboxes 'checked' at that time.

<input type="checkbox" name="Method" value="icon" /> <g:message code="icon.label"/>
<input type="checkbox" name="Method" value="touch-icon" /> <g:message code="touch.label"/>