action.equalsIgnoreCase()和performSave(mapping,form,request,response)这段代码怎么理解阿

Question

   public ActionForward execute(
        ActionMapping mapping,
        ActionForm form,
        HttpServletRequest request,
        HttpServletResponse response) {
               
        String action =mapping.getParameter();
        ActionForward forward=null;
        if(action.equalsIgnoreCase("SAVE")){
            forward=performSave(mapping,form,request,response);
        }else if(action.equalsIgnoreCase("EDIT")){
            forward=performEdit(mapping,form,request,response);
        }else if(action.equalsIgnoreCase("REMOVE")){
            forward=performRemove(mapping,form,request,response);
        }else if(action.equalsIgnoreCase("LIST")){
            forward=performList(mapping,form,request,response);
        }else{
            forward=mapping.findForward("failure");
        }
        return forward;
        
    }

Answer 1

performSave和equalsIgnoreCase是STRUTS中的方法吗

Answer 2

performSave应该是用户自定义的。
equalsIgnoreCase是String类的方法，意思就是比较字符串是否相等并且忽略大小写。