Public synchronized int incContador (int val)

public class MementoDemo {

    public static void main(String[] args) {
        Caretaker caretaker = new Caretaker();

Originator originator = new Originator(); Originator.SetState("State1"); Caretaker.AddMemento( originator.Save() ); Originator.Restore( caretaker.GetMemento() ); } }

public class CompositeDemo {

    public static void main(String[] args) {
        Box root = initialize();
        int[] levels = new int[args.Length];
        For (int i=0; i < args.Length; i++) {
            Levels[i] = Integer.ParseInt(args[i]);
        }
        Root.Traverse( levels );   
  }
private static Box initialize() {
  Box[] nodes = new Box[7];
  Nodes[1] = new Box( 1 );
  Int[] waves = {1, 4, 7};
  For (int i=0; i < 3; i++) {
     Nodes[2] = new Box(21+i);
     Nodes[1].Add(nodes[2]);
     Int level = 3;
   For (int j=0; j < 4; j++) {
     Nodes[level-1].Add(new Product(level*10 + waves[i]));
     Nodes[level] = new Box(level*10 + waves[i]+1);
     Nodes[level-1].Add(nodes[level]);
     Nodes[level-1].Add(new Product(level*10 + waves[i]+2));
     Level++;
      } }
    Return nodes[1];
    }   }




FACTORY
public class FactoryMethodDemo {
    Public static void main(String[] args) {
        DecodedImage decodedImage;
        ImageReader reader = null;
        String image = args[0];
        String format = image.Substring(image.IndexOf('.') + 1
, (image.Length()));
        If (format.Equals("gif")) {
            Reader = new GifReader(image);
        }
        If (format.Equals("jpeg")) {
            Reader = new JpegReader(image);
        }
        Assert reader != null;
        DecodedImage = reader.GetDecodeImage();
        System.Out.Println(decodedImage);
    }       }

SINGLETON
public final class Singleton {
    Private static volatile Singleton instance;

    Private Singleton() {}
    Public static Singleton getInstance(String value) {
        If (instance == null) {
            Synchronized (Singleton.Class) {
                If (instance == null) {
                    Instance = new Singleton();
                }            }        }
        Return instance;
    }        }