claztec's programming RSS FEED

/*the Invoker class*/
public class Switch {
 
    private Command flipUpCommand;
    private Command flipDownCommand;
 
    public Switch(Command flipUpCmd,Command flipDownCmd){
         this.flipUpCommand=flipUpCmd;
         this.flipDownCommand=flipDownCmd;
    }
 
    public void flipUp(){
         flipUpCommand.execute();
    }
 
    public void flipDown(){
         flipDownCommand.execute();
    }
 
}
 
 
/*Receiver class*/
 
public class Light{
 
     public Light(){  }
 
     public void turnOn(){
        System.out.println("The light is on");
     }
 
     public void turnOff(){
        System.out.println("The light is off");
     }
 
}
 
/*the Command interface*/
 
public interface Command{
    void execute();
}
 
 
/*the Command for turning on the light*/
 
public class FlipUpCommand implements Command{
 
   private Light theLight;
 
   public FlipUpCommand(Light light){
        this.theLight=light;
       }
 
   public void execute(){
      theLight.turnOn();
   }
 
}
 
 
 
/*the Command for turning off the light*/
 
public class FlipDownCommand implements Command{
 
   private Light theLight;
 
   public FlipDownCommand(Light light){
        this.theLight=light;
       }
 
   public void execute(){
      theLight.turnOff();
   }
 
}
 
/*The test class or client*/
public class PressSwitch{
 
   public static void main(String[] args){
       Light lamp = new Light();
       Command switchUp=new FlipUpCommand(lamp );
       Command switchDown=new FlipDownCommand(lamp );
 
       Switch s=new Switch(switchUp,switchDown);
 
       try {
           if (args[0].equalsIgnoreCase("ON")){
                s.flipUp();
                System.exit(0);
           }
           if (args[0].equalsIgnoreCase("OFF")){
               s.flipDown();
               System.exit(0);
           }
           System.out.println("Argument \"ON\" or \"OFF\" is required.");
           } catch (Exception e){
            System.out.println("Argument's required.");
           }
 
   }
}