1 //單例模式---懶漢模式
 2 public class Apple{
 3     //建立一個成員，在記憶體中只有一個拷貝
 4     private static Apple apple = null;
 5     private Apple(){
 6         
 7     }
 8     //這個方法用來建立例項
 9     public static Apple Instance(){
10         if(appel == null){
11             Apple apple = new Apple();
12         }
13         return
 
 apple;
14     }
15 }
16 
17 
18 
19 //單例模式---餓漢模式
20 public class Apple2(){
21     private static Apple2 apple2 = new Apple();
22     private Apple2(){
23     
24     }
25     public static Apple2 getInstance(){
26         return apple2;
27     }
28 }