摘要： Java：单例模式的七种写法转载出处：http://cantellow.javaeye.com/blog/838473第一种（懒汉，线程不安全）： 1 public class Singleton { 2 private static Singleton instance; 3 private Singleton (){} 4 5 public static Singleton getInstance() { 6 if (instance == null) { 7 instance = new Singleton(); 8 } 9 ... 阅读全文