Graphical Java face Test-collection __java Basic Learning

Content outline. The difference between PNG HashMap and Hashtable

First look at the Map interface diagram map diagram. png

The difference between Hashtable and hashmap.png list and map distinguishes list and Map.png collection and collections How collection and Collections.png sets distinguish between element duplication

The elements in set cannot be duplicated, and the element repetition is judged using the Equals () method.

The Equals () and = = methods Determine whether the reference value points to the same object. Equals () is overridden in the class to return True heap and stack if the contents and types of two separate objects match heap and stack.png

Long-term sharing of the whole stack sex, the original reason, Java and other articles, interested in the point like and attention to me, welcome to exchange the Author: Fat Chao Link: https://www.jianshu.com/p/4dc43a640460 Source: Jane Book copyright belongs to the author. Commercial reprint please contact the author to obtain authorization, non-commercial reprint please indicate the source.