4-Collection, List, Iterator, and generics

catalogue Tip: here are the basics of Collection, LIst, and generics Tip: the following is the main content of this article. The following cases can be used for reference 1, Collection collection 1. Overview of collections 1.1 overview: A collection is actually a container,Can be used to store data of multiple reference types 1. ...

Posted on Mon, 20 Sep 2021 06:08:11 -0400 by kliopa10

Java collection -- Set interface and its implementation classes HashSet, LinkedHashSet and TreeSet

Set Interface Overview 1. The set interface is a sub interface of the Collection. The set interface does not define additional methods, but uses the methods in the Collection interface. 2. The Set set cannot contain the same elements. If you try to add two identical elements to the same Set set, the add operation fails. 3. Set: store ...

Posted on Thu, 16 Sep 2021 21:05:26 -0400 by spfoonnewb