单例模式，线程安全

 单例模式，线程安全

 

 

public class ThreadLocalSingleton{
    private static ThreadLocal initHolder = new ThreadLocal();
    private static Resource resource = null;

    public Resource getResource(){
        if(initHolder.get() == null){  
            synchronized{
                if(resource == null)
                    resource = new Resource();
                    initHolder.set(Boolean.TRUE);
                }
            }
            return resource;
      } }

 

评论

1 楼 niwtsew 2010-01-11  

a simple one might be:
   1. public class Singleton { 
   2.  
   3.     private static class Holder { 
   4.         private static final Singleton instance = new Singleton(); 
   5.     } 
   6.  
   7.     private Singleton() { 
   8.     } 
   9.  
  10.     public static Singleton getInstance() { 
  11.         return Holder.instance; 
  12.     } 
  13. }