How to compel user ?

u can maintain too status variable. Make them private.. When user uses the first public method set the corresponding private boolean variable to true; do the same for 2nd public method If the user use other public method without using these u can send him a message checking the value of those two variable However, these can be done in run time. I dont think there is any way in design time to make sure user must call some public method prior to calling others. May be u can check these constaints within other public methods . Just for curiosity, why u want to make things like these way ?? :D Cheers