设计模式整理（一） 之 抽象工厂
一、结构图
二、适用性
1、一个应用独立于一产品创建、组合的时候；
2、一个应用要用多个产品中某一产品来进行配置的时候；
3、当你要强调一系列相关的产品对象的设计以便进行联合使用的时候；
4、当你提供一个产品类库，而只想显示它们的接口而不是实现的时候。
三、目的
提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们具体的类。
四、个人感受
抽象工厂模式应该多用于组合，当用不同对象构建另一对象的时候可以把这些全部抽象出来，以便于更多样化的组合；这样保证生成对象的多样性，程序的扩展性增强；此外、可以把一些方法的实现封装起来，形成接口，通过配置或者其他方式，来进行接口的实现。等等。
五、java实现
1、RoomMaker类
public class RoomMaker {
public Room CreateRoom(String roomType) {
if(roomType.equals("LivingRoom")) {
return new LivingRoom();
} else if(roomType.equals("BedRoom")) {
return new BedRoom();
} else {
return new LivingRoom();
}
}
public static void main(String[] args) {
RoomMaker myMaker = new RoomMaker();
//----- Create Living Room
Room myLivingRoom = myMaker.CreateRoom("LivingRoom");
//----- Create a door in living room
Door livingDoor = myLivingRoom.makeDoor();
System.out.println("Living room door name is:" + livingDoor.getName() );
//----- Create a wall in living room
Wall livingWall = myLivingRoom.makeWall();
System.out.println("Living room wall name is:" + livingWall.getName() );
//----- Create Bed Room
Room myBedRoom = myMaker.CreateRoom("BedRoom");
//----- Create a door in bedroom
Door BedDoor = myBedRoom.makeDoor();
System.out.println("Bed room door name is:" + BedDoor.getName() );
//----- Create a wall in bedroom
Wall BedWall = myBedRoom.makeWall();
System.out.println("Bed room wall name is:" + BedWall.getName() );
}
}
2、Room类
public abstract class Room {
public abstract Wall makeWall();
public abstract Door makeDoor();
}
3、Wall类
public abstract class Wall {
//private Wall wall;
public abstract String getName();
}
4、Door类
public abstract class Door {
//private Door door;
public abstract String getName() ;
}
5、BedRoom类
public class BedRoom extends Room {
public BedRoom() {
System.out.println("Initiated a bedroom !");
}
public Door makeDoor() {
return new BedRoomDoor();
}
public Wall makeWall() {
return new BedRoomWall();
}
}
6、LivingRoom类
public class LivingRoom extends Room {
public LivingRoom() {
System.out.println("Initiated a living room !");
}
public Door makeDoor() {
return new LivingRoomDoor();
}
public Wall makeWall() {
return new LivingRoomWall();
}
}
7、BedRoomDoor类
public class BedRoomDoor extends Door {
private String doorName;
public BedRoomDoor() {
doorName = "BedRoomDoor";
}
public String getName() {
return doorName;
}
}
8、BedRoomWall类
public class BedRoomWall extends Wall {
private String wallName;
public BedRoomWall() {
wallName = "BedRoomWall";
}
public String getName() {
return wallName;
}
}
9、LivingRoomDoor类
public class LivingRoomDoor extends Door {
private String doorName;
public LivingRoomDoor() {
doorName = "LivingRoomDoor";
}
public String getName() {
return doorName;
}
}
10、LivingRoomWall类
public class LivingRoomWall extends Wall {
private String wallName;
public LivingRoomWall() {
wallName = "LivingRoomWall";
}
public String getName() {
return wallName;
}
}
