Mediator.java

import java.io.*;
abstract class Mediator{
public abstract void pilotChanged(Pilot
theChangedPilot);
public static void main(String args[]){
ConcreteMediator aConcreteMediator = new
ConcreteMediator();
aConcreteMediator.createConcreteMediator();
(aConcreteMediator.getOnePilot()).Show();
(aConcreteMediator.getNextPilot()).Show();
OnePilot newPilot = new
OnePilot(aConcreteMediator, “OnePilot”);
aConcreteMediator.pilotChanged(
(OnePilot)newPilot );
(aConcreteMediator.getOnePilot()).Show();
(aConcreteMediator.getNextPilot()).Show();
}
}

Pilot.java

abstract class Pilot{
private Mediator mediator;
public Pilot(Mediator m){
mediator = m;
}
public void changed(){
mediator.pilotChanged(this);
}
public Mediator getMediator(){
return(mediator);
}
public abstract void Show();
}

ConcreteMediator.java

class ConcreteMediator extends Mediator{
private OnePilot aOnePilot;
private NextPilot aNextPilot;
public void pilotChanged( Pilot

theChangedPilot ){
if (((
OnePilot)theChangedPilot).getSelection().equals(
aOnePilot.getSelection() ) ){
aNextPilot.setText( aOnePilot.getSelection() );
}}
public void createConcreteMediator(){
aOnePilot = new OnePilot(this, “OnePilot”);
aNextPilot = new NextPilot(this, “NextPilot”);
}
public OnePilot getOnePilot(){
return(aOnePilot);
}
public NextPilot getNextPilot(){
return(aNextPilot);
}
}

OnePilot.java

class OnePilot extends Pilot{
private String text;
public OnePilot(Mediator m, String s){
super( m );
text = s;
}
public void setText(String txt){
text = txt;
}
public String getSelection(){
return(text);
}
public void Show(){
System.out.println(“OnePilot = “ + text);
}
}