NeedVistorPattern.java

public class NeedVistorPattern {
		
	public static void main(String[] args){		
		SpaceShip ship = new BigSpaceShip();
		SpaceShipLauncher launcher = new SpaceShipLauncher();
		
		launcher.launch(ship);	
	}
	
	private static class SpaceShipLauncher{
		public void launch(SpaceShip ship){
			Launcher launcher = new Launcher();
			launcher.launch(ship);
		}
	}
	
	private static class Launcher{
		public void launch(SpaceShip ship){
			System.out.println("Got a SpaceShip");			
		}
		public void launch(BigSpaceShip ship){
			System.out.println("Got a BigSpaceShip");			
		}
	}
	
	private static class BigSpaceShip extends SpaceShip{
	}
	private static class SpaceShip{
	}