欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

java设计模式--简单工厂模式

程序员文章站 2022-03-06 23:50:22
...
简单工厂模式的概念

<!--5f39ae17-8c62-4a45-bc43-b32064c9388a:[{"blockId":"9547-1546657505512","blockType":"paragraph","styles":{},"type":"paragraph","richText":{"data":[{"char":"简","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"单","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"工","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"厂","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"模","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"式","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"概","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}},{"char":"念","styles":{"bold":true,"font-family":"Verdana","font-size":16,"color":"#333333","back-color":"#ffffff"}}],"isRichText":true,"keepLineBreak":true}},{"blockId":"2995-1546657600738","blockType":"paragraph","styles":{"back-color":"#ffffff","align":"left"},"type":"paragraph","richText":{"data":[{"char":"　","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"　","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"就","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"是","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"建","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"立","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"个","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"工","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"厂","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"，","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"对","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"实","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"现","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"了","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"同","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"接","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"口","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"些","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"进","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"行","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"实","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"例","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"创","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"建","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"。","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"简","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"单","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"工","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"厂","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"模","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"式","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"实","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"质","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"是","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"由","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"个","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"工","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"厂","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"根","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"据","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"传","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"入","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"参","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"数","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"，","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"动","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"态","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"决","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"定","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"应","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"该","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"创","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"建","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"哪","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"个","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"产","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"品","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"（","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"这","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"些","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"产","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"品","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"继","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"承","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"自","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"一","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"个","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"父","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"类","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"或","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"接","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"口","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"）","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"的","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"实","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"例","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}},{"char":"。","styles":{"font-family":"Verdana","color":"#333333","back-color":"#ffffff"}}],"isRichText":true,"keepLineBreak":true}}]-->

  就是建立一个工厂类,对实现了同一接口的一些类进行实例的创建。简单工厂模式的实质是由一个工厂类根据传入的参数,动态决定应该创建哪一个产品类(这些产品类继承自一个父类或接口)的实例。
简单工厂模式的UML图

java设计模式--简单工厂模式
            
    
    博客分类: java java设计模式
 
示例代码:

java设计模式--简单工厂模式
            
    
    博客分类: java java设计模式
 
产品抽象接口
/**
 * 产品的抽象接口  水果
 * @author ninghq
 *
 */
public interface Fruit {

	public void name();
}
 产品具体类
/**
 * Apple 苹果
 * @author ninghq
 *
 */
public class Apple implements Fruit {

	@Override
	public void name() {
		// TODO Auto-generated method stub
		System.out.println("苹果");
	}

}
 
/**
 * Banana 香蕉
 * @author ninghq
 *
 */
public class Banana implements Fruit {

	@Override
	public void name() {
		// TODO Auto-generated method stub
		System.out.println("香蕉");
	}

}
 工厂类
/**
 * 简单工厂
 * @author ninghq
 *
 */
public class SampleFactory {
	
	public static Fruit makeFruit(String type){
		if(type.equals("apple")){
			Fruit fruit = new Apple();
            return fruit;
        }else if(type.equals("banana")){
        	Fruit fruit = new Banana();
            return fruit;
        }else{
            System.out.println("生产不出来");
            return null;
        }       
	}

}
 
/**
 * 简单工厂反射实现
 * @author ninghq
 *
 */
public class SampleFactory1 {
	public static Fruit makeFruit(Class c){
		Fruit fruit = null;
        try {
        	fruit = (Fruit) Class.forName(c.getName()).newInstance();
        } catch (InstantiationException e) {
            System.out.println("不支持抽象类或接口");
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            System.out.println("没有足够权限,即不能访问私有对象");
        } catch (ClassNotFoundException e) {
            System.out.println("类不存在");
            e.printStackTrace();
        }    
        return fruit;
    }
}
 客户端
/**
 * 简单工厂客户端
 * @author ninghq
 *
 */
public class Client {
	public static void main(String[] args) {
//      Fruit apple = SampleFactory.makeFruit("apple");
//      apple.name();
//      Fruit banana = SampleFactory.makeFruit("banana");
//      banana.name();
//      Fruit test = SampleFactory.makeFruit("1111");
     
      Fruit apple = SampleFactory1.makeFruit(Apple.class);
      apple.name();
      Fruit banana = SampleFactory1.makeFruit(Banana.class);
      banana.name();
  }

}
 
简单工厂模式特点
优点:工厂类是整个模式的关键.包含了必要的逻辑判断,根据外界给定的信息,决定究竟应该创建哪个具体类的对象.通过使用工厂类,外界可以从直接创建具体产品对象的尴尬局面摆脱出来,仅仅需要负责“消费”对象就可以了。而不必管这些对象究竟如何创建及如何组织的.明确了各自的职责和权利,有利于整个软件体系结构的优化。
 
     缺点:由于工厂类集中了所有实例的创建逻辑,违反了高内聚责任分配原则,将全部创建逻辑集中到了一个工厂类中;它所能创建的类只能是事先考虑到的,如果需要添加新的类,则就需要改变工厂类了。当系统中的具体产品类不断增多时候,可能会出现要求工厂类根据不同条件创建不同实例的需求.这种对条件的判断和对具体产品类型的判断交错在一起,很难避免模块功能的蔓延,对系统的维护和扩展非常不利;
  • java设计模式--简单工厂模式
            
    
    博客分类: java java设计模式
  • 大小: 20.4 KB
  • java设计模式--简单工厂模式
            
    
    博客分类: java java设计模式
  • 大小: 5.6 KB
相关标签: java 设计模式