Java抽象工厂模式

ゞ浴缸里的玫瑰 2024-02-19 12:54 57阅读 0赞

#### 抽象工厂模式，也称为工厂的工厂，由一个工厂创建其他工厂。 ####

当使用抽象工厂模式时，我们首先使用超级工厂创建工厂，然后使用创建的工厂创建对象

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使用抽象工厂的步骤：

1.建2个接口

package com.test;
    
    public interface IPrinter {
    	void print();
    }

package com.test;
    
    public interface IShape {
    	void draw();
    }

2.建一个抽象类来封装这2个接口

package com.test;
    
    public abstract class AbstractFactory {
    	abstract IPrinter getPrinter(String type);
    	abstract IShape   getShape(String shape);
    }

3.分别写这2个接口的实现类

package com.test;
    
    public class Circle implements IShape{
    
    	public void draw() {
    		// TODO Auto-generated method stub
    		System.out.println("Inside Circle::draw() method.");
    	}
    
    }

package com.test;
    
    public class Rectangle implements IShape {
    
    	public void draw() {
    		System.out.println("Inside Rectangle::draw() method");
    	}
    
    }

package com.test;
    
    public class Square implements IShape{
    
    	public void draw() {
    		System.out.println("Inside Square::draw() method.");
    	}
    
    }

package com.test;
    
    public class PaperPrinter implements IPrinter {
    
    	public void print() {
    		// TODO Auto-generated method stub
    		System.out.println("paper");
    	}
    
    }

package com.test;
    
    public class ScreenPrinter implements IPrinter {
    
    	public void print() {
    		// TODO Auto-generated method stub
    		System.out.println("screen");
    	}
    
    }

package com.test;
    
    public class WebPrinter implements IPrinter {
    
    	public void print() {
    		// TODO Auto-generated method stub
    		System.out.println("Web");
    	}
    
    }

4.创建2个接口的工厂类

package com.test;
    
    public class ShapeFactory extends AbstractFactory{
    
    	IShape 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;
    	}
    
    	IPrinter getPrinter(String type) {
    		return null;
    	}
    
    }

package com.test;
    
    public class PrinterFactory extends AbstractFactory{
    
    	IPrinter getPrinter(String type) {
    		if(type == null){
    			return null;
    		}
    		if(type.equalsIgnoreCase("paper")){
    			return new PaperPrinter();
    		}else if(type.equalsIgnoreCase("web")){
    			return new WebPrinter();
    		}else if(type.equalsIgnoreCase("screen")){
    			return new ScreenPrinter();
    		}
    		return null;
    	}
    
    	IShape getShape(String shape) {
    		// TODO Auto-generated method stub
    		return null;
    	}
    
    }

5.创建超级工厂类，来获取2个子工厂

package com.test;
    
    public class FactoryProducer {
    
    	public static AbstractFactory getFactory(String choice) {
    		
    		if(choice.equalsIgnoreCase("shape")){
    			return new ShapeFactory();
    		}else if(choice.equalsIgnoreCase("printer")){
    			return new PrinterFactory();
    		}		
    		return null;	
    	}
    }

6.创建测试类，测试程序

package com.test;
    
    public class Main {
    	public static void main(String args[]) {
    		//用FactoryProducer获取shapeFactory
    		AbstractFactory shapeFactory =FactoryProducer.getFactory("shape");
    		
    		//用shapeFactory获取circle  rectangle  square 
    		IShape circle = shapeFactory.getShape("circle");
    		circle.draw();
    		IShape rectangle = shapeFactory.getShape("rectangle");
    		rectangle.draw();
    		IShape square = shapeFactory.getShape("square");
    		square.draw();
    		
    		
    		AbstractFactory printerFactory =FactoryProducer.getFactory("printer");
    		
    		IPrinter paper = printerFactory.getPrinter("paper");
    		paper.print();
    		IPrinter Web = printerFactory.getPrinter("Web");
    		Web.print();
    		IPrinter Screen = printerFactory.getPrinter("Screen");
    		Screen.print();
    		
    	}
    }

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代码下载地址如下

[https://download.csdn.net/download/thinkpet/10757850][https_download.csdn.net_download_thinkpet_10757850]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5rUGV0_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/27ff5d42743441e181610d3523ed9756.png
[https_download.csdn.net_download_thinkpet_10757850]: https://download.csdn.net/download/thinkpet/10757850