public class MementoExample {
public static void main (String[] arg) {
RandomWalker luke = new RandomWalker();
// Creates a Memento that saves the original state
Memento tripStop = luke.createMemento();
for(int i=1; i<=4 ;i++) {
System.out.println("Starting trip...");
luke.randomWalk();
whereIs( luke );
System.out.println("Do you like this place?");
if(Math.random() < .4) {
System.out.println("-No!");
// Restores the last saved state
tripStop.restoreState();
whereIs( luke );
}else {
System.out.println("-Yes!");
// Creates a new Memento to save the new state
tripStop = luke.createMemento();
}
}
System.out.println("You reach the km" +luke.getCurrentMilestone());
}

public static void whereIs( RandomWalker rw ) {
System.out.print ( "You are now stopped at km " +
rw.getCurrentMilestone()+ ". " );
System.out.println( "This place is "+ rw.getLastWalkedDistance()
+ " kms far from your last stop. ");
}

}