Android学习笔记--设计模式--工厂

首先是简单工厂

先建立一个抽象类

1 package gongchang;
2 
3 public abstract class Formlaf {
4     
5     public abstract void getColor();
6 }

之后建立产品1

 1 package gongchang;
 2 
 3 public class Cilck extends Formlaf{
 4 
 5     @Override
 6     public void getColor() {
 7         System.out.println("苹果是红色的");
 8     }
 9     
10 }

产品2

1 package gongchang;
2 
3 public class Clicks extends Formlaf{
4 
5     @Override
6     public void getColor() {
7         System.out.println("橘子是橙色的");
8     }
9 }

建立一个单例来返回实例

 1 package gongchang;
 2 
 3 public class Fromf  {
 4     private static Formlaf fromlaf;//所有文件的父类
 5     private Fromf(){};
 6     
 7     public static Formlaf getIntss(int a){
 8         if(fromlaf == null){
 9             synchronized (Fromf.class) {
10                 if(fromlaf == null){
11                     switch (a) {
12                     case 1:
13                         //等于1的时候new苹果，
14                         return fromlaf = new Cilck();
15                     case 2:
16                         //等于2的时候new橘子，
17                         return fromlaf = new Clicks();
18                     default:
19                         break;
20                     }
21                 }
22             }
23         }
24         return null;
25     }
26     
27 }

建立客户端

 1 package gongchang;
 2 
 3 public class kaigong {
 4     private static int PING = 1;
 5     private static int JU = 2;
 6     public static void main(String[] args) {
 7         //根据传入的值来判断new什么文件
 8         Formlaf formlams = Fromf.getIntss(1);
 9         formlams.getColor();
10         
11     }
12 }