trigger critic check singleton plausibl candid singleton design pattern class instanc variabl non attribut outgo associ param dm link java lang object object check critic param dsgr link argouml cognit design design creat model us futur develop argo uml link problem problem critic trigger link problem problem overrid predic object dm design dsgr look class model facad dm problem associ class model facad associ dm problem model facad dm equal model facad dm problem incomplet import model facad primari object dm problem class hardli singleton model facad dm problem check singleton stereotyp uninitialis instanc variabl outgo associ java doc model facad singleton dm problem model facad util dm problem attribut problem iter iter model facad attribut dm iter iter model facad iter problem outgo associ problem iter end model facad associ end dm iter end iter otherend model facad associ end end iter otherend model facad navig otherend problem problem 