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 Pay.java

1 package factory;
2 
3 public interface Pay {
4     
5     void unifiedorder();
6 
7 }

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WeChatPay.java

1 package factory;
2 
3 public class WechatPay implements Pay {
4 
5     public void unifiedorder() {
6         System.out.println("微信支付 统一下单接口");
7     }
8 }

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AliPay.java:

1 package factory;
2 
3 public class AliPay implements Pay {
4     
5     public void unifiedorder() {
6         System.out.println("支付宝支付 统一下单接口");
7     }
8 
9 }

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SimplePayFactory.java:

 1 package factory;
 2 
 3 public class SimplePayFactory {
 4 
 5     public static Pay createPay(String payType){
 6         if (payType == null) {
 7             return null;
 8         }else if(payType.equalsIgnoreCase("WECHAT PAY")) {
 9             return new WechatPay();
10         }else if(payType.equalsIgnoreCase("Ali PAY")) {
11             return new AliPay();
12         }
13         
14         return null;
15     }
16 }

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Main.java:

 1 package factory;
 2 
 3 public class Main {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7 
 8         Pay pay = SimplePayFactory.createPay("WECHAT PAY");
 9         
10         Pay pay2 = SimplePayFactory.createPay("Ali PAY");
11         
12         pay.unifiedorder();
13         
14         pay2.unifiedorder();
15     
16     
17     }
18 
19 }

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