未命名

 1 public class Singleton{
 2   /* 懒汉式 */
 3   private static Singleton instance = new Singleton();
 4   
 5   private Singleton(){}
 6   
 7   public static Singleton getInstance(){
 8     return instance;
 9   }
10 }
11 
12 public class Singleton{
13   /* 饿汉式 */
14   private static Singleton instance = null;
15   
16   private Singleton(){}
17   
18   public static Singleton getInstance(){
19     if(instance == null)
20         instance = new Singleton();
21     return instance;
22   }
23 }