单例模式之一

 1 class Singelton {
 2 private static singleton instance;
 3 //构造方法让其private，这就封住了外界利用new创建实例的可能
 4 private Singleton(){}
 5 
 6 //该方法是活的哥本类实例的唯一全局访问点
 7 public static Singleton GetInstance(){
 8 
 9 //若实例不存在，则new一个新实例，否则返回已有的实例
10 if (instance == null){
11 instance=new Singleton()
12 }
13 
14 return instance ;
15 
16 }
17 }

 1 //实现赖式单态类
 2       private static ControlConfigurationFiles object = null;
 3   
 4       public static synchronized ControlConfigurationFiles getInstance(ServletContext context) {
 5           //获取web项目中ccs的配置文件
 6           ControlConfigurationFiles.filePath = context.getRealPath("/WEB-INF/classes/ccs.properties");
 7           
 8           if (object == null) {
 9               object = new ControlConfigurationFiles(ControlConfigurationFiles.filePath);
10          }
11          
12          return object;    
13 }

 

转载于:https://www.cnblogs.com/jimw/p/4843377.html