execute method signature in the Struts1.x , Action class child class

1 . execute method is public

so

 public execute(){

}

2. it should return ActionForward instance 

so

public ActionForward execute(){

}

3. it must have ActionMapping , ActionForm, HttpServletRequest  and HttpServletResponse arguments

so

public ActionForward execute(ActionMapping map, ActionForm form , HttpServletRequest req, HttpServletResponse) throw Exception{

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return map.findForward("SUCESS");

}