йŮU20vsŮU23

?󲿷ֹ˾ֻһʣʣżһгռʣ̸ñȽ϶ࡣҵ֮㵽ҼʮԪΪԺҵЧʡЧˡLinkedListArrayListʲôʱArrayList,LinkedList,Vector˭ٶȽϿ죿ArrayListArrayListHashMapĬϴСǶArrayListLinkedListʲôʱArrayListArrayListSetArrayList,LinkedList,VectorArrayListʵֵģArrayListLinkedListArrayListʵArrayArrayListкʲôʱʺArray˵ArraList,Vector,LinkedListĴ洢ܺMapMap,Set,List,Queue,StackMapӿṩЩͬļͼΪʲôMapӿڲ̳CollectionӿCollectionsJavaеCollectionFrameWork2ʵ&ãڶԲҵ׶ε˽⣬ƶࡰáóܶʵսӦùߡ
4.15全民国家安全教育日:一起聚焦网络安全