问题描述
https://www.lintcode.com/problem/singleton/description?_from=ladder&&fromId=6
public class Singleton{
//volatile保证了其他线程拿到的也是最新的实例
private volatile static Singleton instance;
//将默认的构造函数私有化，防止其他类手动new
private Singleton(){};
public static Singleton getInstance(){
if(instance==null){
synchronized(Singleton.class){
if(instance==null){
instance=new Singleton();
}
}
}
return instance;
}
}
网友评论