📅  最后修改于: 2020-12-21 01:58:09             🧑  作者: Mango
抽象工厂模式围绕创建其他工厂的超级工厂工作。该工厂也称为工厂工厂。这种设计模式属于创建模式,因为该模式提供了创建对象的最佳方法之一。
在“抽象工厂”模式中,接口负责创建相关对象的工厂,而无需显式指定其类。每个生成的工厂都可以按照Factory模式提供对象。
我们将创建一个Shape接口和一个实现它的具体类。下一步,我们创建一个抽象工厂类AbstractFactory。定义了工厂类ShapeFactory,它扩展了AbstractFactory。创建工厂创建者/生成器类FactoryProducer。
AbstractFactoryPatternDemo,我们的演示类使用FactoryProducer来获取AbstractFactory对象。它将信息(形状的CIRCLE / RECTANGLE / SQUARE)传递给AbstractFactory以获得所需的对象类型。
创建形状的界面。
Shape.java
public interface Shape {
void draw();
}
创建实现相同接口的具体类。
RoundedRectangle.java
public class RoundedRectangle implements Shape {
@Override
public void draw() {
System.out.println("Inside RoundedRectangle::draw() method.");
}
}
RoundedSquare.java
public class RoundedSquare implements Shape {
@Override
public void draw() {
System.out.println("Inside RoundedSquare::draw() method.");
}
}
Rectangle.java
public class Rectangle implements Shape {
@Override
public void draw() {
System.out.println("Inside Rectangle::draw() method.");
}
}
创建一个Abstract类以获取法线和圆形对象的工厂。
抽象工厂
public abstract class AbstractFactory {
abstract Shape getShape(String shapeType) ;
}
创建扩展AbstractFactory的Factory类,以根据给定的信息生成具体类的对象。
ShapeFactory.java
public class ShapeFactory extends AbstractFactory {
@Override
public Shape getShape(String shapeType){
if(shapeType.equalsIgnoreCase("RECTANGLE")){
return new Rectangle();
}else if(shapeType.equalsIgnoreCase("SQUARE")){
return new Square();
}
return null;
}
}
RoundedShapeFactory.java
public class RoundedShapeFactory extends AbstractFactory {
@Override
public Shape getShape(String shapeType){
if(shapeType.equalsIgnoreCase("RECTANGLE")){
return new RoundedRectangle();
}else if(shapeType.equalsIgnoreCase("SQUARE")){
return new RoundedSquare();
}
return null;
}
}
创建一个Factory生成器/ Producer类,以通过传递诸如Shape之类的信息来获取工厂
FactoryProducer.java
public class FactoryProducer {
public static AbstractFactory getFactory(boolean rounded){
if(rounded){
return new RoundedShapeFactory();
}else{
return new ShapeFactory();
}
}
}
使用FactoryProducer来获取AbstractFactory,以便通过传递诸如类型之类的信息来获得具体类的工厂。
AbstractFactoryPatternDemo.java
public class AbstractFactoryPatternDemo {
public static void main(String[] args) {
//get shape factory
AbstractFactory shapeFactory = FactoryProducer.getFactory(false);
//get an object of Shape Rectangle
Shape shape1 = shapeFactory.getShape("RECTANGLE");
//call draw method of Shape Rectangle
shape1.draw();
//get an object of Shape Square
Shape shape2 = shapeFactory.getShape("SQUARE");
//call draw method of Shape Square
shape2.draw();
//get shape factory
AbstractFactory shapeFactory1 = FactoryProducer.getFactory(true);
//get an object of Shape Rectangle
Shape shape3 = shapeFactory1.getShape("RECTANGLE");
//call draw method of Shape Rectangle
shape3.draw();
//get an object of Shape Square
Shape shape4 = shapeFactory1.getShape("SQUARE");
//call draw method of Shape Square
shape4.draw();
}
}
验证输出。
Inside Rectangle::draw() method.
Inside Square::draw() method.
Inside RoundedRectangle::draw() method.
Inside RoundedSquare::draw() method.