最初的代码 在最近的项目中,写出了这样的一段代码 private static SomeClass instance; public SomeClass getInstance() { if (null == instance) { instance = new SomeClass(); } return instance; } 然后在Code Review的时候被告知在多线程的情况下,这样写可能会导致instance有多个实例.比如下面这种情况: Time Thread A Thread B
Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Given linked list -- head = [4,5,1,9], which looks like following: Example 1: Input: head = [4,5,1,9], node = 5 Output: [4,1,9] Explanation:
Manage nodes in a swarm在集群中管理节点 List nodes列举节点 为了查看集群中的节点列表,可以在管理节点中运行docker node ls: $ docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 46aqrk4e473hjbt745z53cr3t node- Ready Active Reachable 61pi3d91s0w3b90ijw3deeb2q node- Ready Active
