Case Analysis of HashMap Red-Black Tree
This article mainly introduces the relevant knowledge of HashMap red-black tree case analysis, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this HashMap red-black tree case analysis article. Let's take a look at it.
After HashMap 1.8, the underlying data structure changes from array + linked list to array + linked list + red-black tree and node TreeNode of red-black tree.
TreeNode parent; / / red-black tree links TreeNode left; left node TreeNode right; right node TreeNode prev; parent node / / whether the color is red
The characteristics of red and black trees:
The node is red or black
The root node must be black
The leaf node Null is black
If a node is red, its child nodes must be black
The number of black nodes on the path from a node to a leaf node is the same.
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