重點(diǎn)
一個(gè)抽象的工廠類，其他小工廠繼承該工廠
Abstract Factory
public class FactoryProducer {
public static AbstractFactory getFactory(String choice){
if(choice.equalsIgnoreCase("SHAPE")){
return new ShapeFactory();
} else if(choice.equalsIgnoreCase("COLOR")){
return new ColorFactory();
}
return null;
}
}
public abstract class AbstractFactory {
public abstract Color getColor(String color);
public abstract Shape getShape(String shape) ;
}
public class ShapeFactory extends AbstractFactory {
@Override
public Shape getShape(String shapeType){
if(shapeType == null){
return null;
}
if(shapeType.equalsIgnoreCase("CIRCLE")){
return new Circle();
} else if(shapeType.equalsIgnoreCase("RECTANGLE")){
return new Rectangle();
} else if(shapeType.equalsIgnoreCase("SQUARE")){
return new Square();
}
return null;
}
@Override
public Color getColor(String color) {
return null;
}
}
public class AbstractFactoryPatternDemo {
public static void main(String[] args) {
//獲取形狀工廠
AbstractFactory shapeFactory = FactoryProducer.getFactory("SHAPE");
//獲取形狀為 Circle 的對(duì)象
Shape shape1 = shapeFactory.getShape("CIRCLE");
//調(diào)用 Circle 的 draw 方法
shape1.draw();
}
使用場(chǎng)景
當(dāng)一個(gè)產(chǎn)品族中的多個(gè)對(duì)象被設(shè)計(jì)成一起工作時(shí)秸弛，它能保證客戶端始終只使用同一個(gè)產(chǎn)品族中的對(duì)象.
