1 /**
 2  * 定义接口
 3  * @author abc
 4  *
 5  */
 6 public interface Api {
 7     public void test1();
 8 }
 9
10 /**
11  * 接口实现类1
12  * @author abc
13  *
14  */
15 public class Impl1 implements Api {
16
17     @Override
18     public void test1() {
19         System.out.println("实现test1方法");
20     }
21 }
22
23 /**
24  * 接口实现类2
25  * @author abc
26  *
27  */
28 public class Impl2 implements Api {
29
30     @Override
31     public void test1() {
32         System.out.println("实现test1方法");
33     }
34 }
35
36 /**
37  * 工厂类
38  * @author abc
39  *
40  */
41 public class Factory {
42     /**
43      * 根据条件创建不同的实现来
44      * @param condition 实现条件
45      * @return
46      */
47     public static Api createImpl(int condition) {
48         Api api = null;
49         if (condition == 1) {
50             api = new Impl1();
51         } else if (condition == 2) {
52             api = new Impl2();
53         }
54         return api;
55     }
56
57     public static void main(String[] args) {
58         Api api = Factory.createImpl(1);
59         api.test1();
60         api = Factory.createImpl(2);
61         api.test1();
62
63     }
64 }

/*** 定义接口* @author abc**/
public interface Api {public void test1();
}/*** 接口实现类1* @author abc**/
public class Impl1 implements Api {@Overridepublic void test1() {System.out.println("实现test1方法");}
}/*** 接口实现类2* @author abc**/
public class Impl2 implements Api {@Overridepublic void test1() {System.out.println("实现test1方法");}
}package cn.itcast.demo;import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;import javax.xml.ws.FaultAction;/*** 工厂类* @author abc**/
public class Factory {/*** 根据条件创建不同的实现来* @param condition 实现条件* @return*/public static Api createImpl() {Properties p = new Properties();InputStream in = null;Api api = null;try {in = Factory.class.getResourceAsStream("FactoryTest.properties");p.load(in);} catch (IOException e) {e.printStackTrace();} finally {try {if (in != null) {in.close();in = null;}} catch (IOException e) {// TODO Auto-generated catch block
                e.printStackTrace();}}try {api = (Api)Class.forName(p.getProperty("FactoryTest")).newInstance();} catch (InstantiationException e) {// TODO Auto-generated catch block
            e.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch block
            e.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch block
            e.printStackTrace();}return api;}public static void main(String[] args) {Api api = Factory.createImpl();api.test1();}
}FactoryTest.properties
#配置文件
FactoryTest=cn.itcast.demo.Impl1