Hashmap change in Java 8: Using binary search tree when greater than TREEIFY_THRESHOLD The principal...

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Hashmap change in Java 8: Using binary search tree when greater than TREEIFY_THRESHOLD
The principal idea is that once the number of items in a hash bucket grows beyond a certain threshold(currently: TREEIFY_THRESHOLD = 8), that bucket will switch from using a linked list of entries to a balanced tree. In the case of high hash collisions, this will improve worst-case performance from O(n) to O(log n).
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If hashes are equal, HashMap hopes that the keys are Comparable, so that it can establish some order. 
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a shared underlying storage
Shared empty table in ArrayList and HashMap update
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static final Object[] EMPTY_ELEMENTDATA = {};

Author, Mike Duigou. Owner, Brent Christian. Created, 2013/02/08 20:00. Updated, 2014/07/10 20:15. Type, Feature. Status, Completed. Component, core-libs. Scope, Implementation. Discussion, core dash libs dash dev at openjdk dot java dot net ...

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