SP - Chain of Responsibility Pattern

package ZCOR1;

// Zadatak ZCOR1: Omoguciti da program prikaze sledece poruke:
// Juce je bio oblacan dan.
// Danas je lep dan.
// Sutra ce biti jos lepsi dan.
//
// Program se moze samo menjati na mestu tri tacke.

class Client
{public static void main(String[] args) {
       ConcreteHandler1 ch1 = new ConcreteHandler1(null);
       ConcreteHandler2 ch2 = new ConcreteHandler2(ch1);
       ConcreteHandler3 ch3 = new ConcreteHandler3(ch2);
       ch3.HandleRequest();
    }
}

class Handler
{
   Handler successor;
   Handler(Handler successor1){successor=successor1;}
   void HandleRequest()
     {
         if (successor != null) successor.HandleRequest();
     }
}

class ConcreteHandler1 extends Handler{
    ConcreteHandler1(Handler successor) {super(successor);}
   @Override
   void HandleRequest() { super.HandleRequest(); System.out.println("Danas je lep dan."); }
}

class ConcreteHandler2 extends Handler{
    ConcreteHandler2(Handler successor) {super(successor);}
   @Override
   void HandleRequest() { super.HandleRequest(); System.out.println("Sutra ce biti jos lepsi dan."); }
}

class ConcreteHandler3 extends Handler{
    ConcreteHandler3(Handler successor) {super(successor);}
   @Override
   void HandleRequest() {
       System.out.println("Juce je bio oblacan dan.");
       super.HandleRequest();  }
}