Factory pattern

Factory Pattern - a type of Creational Pattern. The creational patterns deal with the best way to create instances of objects.

Sample design

 public interface IEquipment {
  String getType();
}

public abstract class Equipment implements IEquipment{
  public String getNumber() {
    return number;
  }
  protected void setNumber(String number) {
    this.number = number;
  }
  private String number;
}


public class Container extends Equipment{
  public Boolean getIsReefer() {
    return isReefer;
  }
  protected void setIsReefer(Boolean isReefer) {
    this.isReefer = isReefer;
  }
  public String getType() {
    return "Container";
  }

  private Boolean isReefer;
}


public class Chassis extends Equipment {
  public Boolean getIsWheeled() {
    return isWheeled;
  }
  protected void setWheeled(Boolean isWheeled) {
    this.isWheeled = isWheeled;
  }
  public String getType() {
    return "Chassis";
  }

  private Boolean isWheeled;
}


public class Accessory extends Equipment {
  public String getDescription() {
    return description;
  }
  protected void setDescription(String description) {
    this.description = description;
  }
  public String getType() {
    return "Accessory";
  }

  private String description;
}


// Factory producing Equipments
public class EquipmentFactory {
  public static IEquipment createEquipment(String inEquipmentType) {
    IEquipment equipment = null;
    if (CONTAINER.equals(inEquipmentType)) {
      equipment = new Container();
    } else if (CHASSIS.equals(inEquipmentType)) {
      equipment = new Chassis();
    } else if (ACCESSORY.equals(inEquipmentType)) {
      equipment = new Accessory();
    }
    return equipment;
  }

  private static final String CONTAINER = Container.class.getName();
  private static final String CHASSIS = Chassis.class.getName();
  private static final String ACCESSORY = Accessory.class.getName();
}