Design Pattern Explained

1. The Command Pattern:
   • encapsulates a request as an object, thereby letting you parameterize other objects with different requests, queue or log requests, and support undoable operations

   • public interface Command {
       public void execute();
     }
     
     public class LightOnCommand implements Command {
       Light light;
     
       public LightOnCommand(Light light) {
         this.light = light;
       }
     
       public void execute() {
         light.on();
       }
     }
     
     public class RemoteControl {
       Command slot;
     
       public RemoteControl() {}
       
       public void setCommand(Command slot) {
         this.slot = slot;
       }
     
       public void buttonPressed() {
         slot.execute();
       }
     }

      

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