设计模式：工厂模式

 

 

 

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);
}

 

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;
	}

}

 

 

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;
	}

}

 

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;
		}
	}
}

 

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"));
	}
}