Java简单工厂模式(SimpleFactoryMode)

何为简单工厂模式？

由一个工厂类根据传入的参数，动态创建并返回相应的具体的实例！

三个构成元素：

1、工厂类

2、抽象产品

3、具体产品

优点：

1、提高扩展性

2、隐藏具体的实现类，并不需要知道产品具体的创建过程，只需要向工厂类传入相应参数，就可以获取相应的产品实例！

代码演示：

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// 抽象产品 package com.test.simplefactory; public interface Person { public String sayHello(String name); public String sayGoodbye(String name); }

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package com.test.simplefactory; // 具体产品1 public class Chinese implements Person { @Override public String sayHello(String name) { return "你好," + name; } @Override public String sayGoodbye(String name) { return "再见," + name; } }

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package com.test.simplefactory; // 具体产品2 public class American implements Person { @Override public String sayHello(String name) { return "hello," + name; } @Override public String sayGoodbye(String name) { return "goodbye," + name; } }

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package com.test.simplefactory; // 工厂类 public class PersonFactory { // 根据参数的不同返回不同的实例 public Person getPerson(String name){ Person person = null; if("chinese".equals(name)){ person = new Chinese(); }else if("american".equals(name)){ person = new American(); } return person; } }

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package com.test.simplefactory; // 测试 public class Client { public static void main(String[] args) { /*Person chinese = new Chinese(); System.out.println(chinese.sayHello("张三")); System.out.println(chinese.sayGoodbye("张三")); Person american = new American(); System.out.println(american.sayHello("Tom")); System.out.println(american.sayGoodbye("Tom"));*/ PersonFactory factory = new PersonFactory(); Person chinese = factory.getPerson("chinese"); System.out.println(chinese.sayHello("张三")); } }