RE: Singleton a dedicnost

[Brinza, Boris]

Cauko   Singleton nie je to prave orechove pre to, co chces spravit, resp. to nespravis....   Co napriklad v pripade, ze mas 2 triedy MyApp1 a MyApp2, obe dedia od KernelApp   Co vrati KernelApp.getApp()????   Podla mna na to cele ides zo zlej strany   From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vlastimil Eliáš Sent: Friday, February 17, 2006 3:55 PM To: Java Subject: Re: Singleton a dedicnost Obavam se ze statickou metodu v potomkovi neprepisete :-( Take konstrukce public static KernelApp getApp() {  // metoda kt. robi singleton    if (app == null)      app = new createApp();    return app;  } neni asi to prave (to new tam moc nesedi). Vl. [EMAIL PROTECTED] napsal(a): Nakoniec som to vyriesil takto, dufam ze je to spravne riesenie: // predok KernelApp public class KernelApp {  private KernelApp app;  // interna premenna    protected KernelApp() {   // konstruktor predka  }     protected static KernelApp createApp() {     return null;  // tuto metodu prepisem v potomkovi   }    public static KernelApp getApp() {  // metoda kt. robi singleton    if (app == null)      app = new createApp();    return app;  } } // potomok MojaApp public classMojaApp extends KernelApp {    protected MojaApp() {  // konstruktor potomka    super();    // nejaka moja cinnost  }     protected static KernelApp createApp() {     return new MojaApp();  // vratim si instanciu potomka   } } Marian Stevlik (Michal) IS programmer / developer GAMO a.s. Kyjevske nam. 6 974 04 Banska Bystrica web: www.gamo.sk mail: [EMAIL PROTECTED] tel: +421 48 4372098, 4137935, 4372111 gsm: +421 905 462010 icq: 38493645 skype: majklbb -- Ing. Vlastimil Elias Qbizm technologies, a.s. vedouci analytik ... the art of software. ____________________________________________________________________ www.qbizm-technologies.cz www.qbizm.cz www.qbizm-services.cz