设计模式：工厂模式

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代码示例：

定义一个Person接口

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

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定义两个具体类，分别实现Person接口

package com.test.simplefactory;public class Chinese implements Person {public String sayGoodbye(String name) {return "再见！ "+name;}public String sayHello(String name) {return "你好！ "+name;}}

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package com.test.simplefactory;public class American implements Person {public String sayGoodbye(String name) {return "GoodBye! "+name;}public String sayHello(String name) {return "Hello! "+name;}}

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工厂类，根据参数生成具体实例

package com.test.simplefactory;public class PersonFactory {public static Person getPerson(String name) {if (name.equals("chinese")) {return new Chinese();} else if (name.equals("american")) {return new American();} else {return null;}}}

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测试类

package com.test.simplefactory;public class Client {public static void main(String[] args) {Chinese chinese = (Chinese) PersonFactory.getPerson("chinese");System.out.println(chinese.sayHello("lisi"));System.out.println(chinese.sayGoodbye("lisi"));American american = (American) PersonFactory.getPerson("american");System.out.println(american.sayHello("lisi"));System.out.println(american.sayGoodbye("lisi"));}}

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