Comparing collections

Below I created two tables comparing the different Java collection types. It is mainly relevant with regards to 1Z0-819.

The first table is about characteristics, the second about implemented interfaces.

	ArrayList	LinkedList	HashSet	TreeSet	HashMap	TreeMap
resizable	✅	✅	✅	✅	✅	✅
duplicates allowed	✅	✅			✅ (not keys)	✅ (not keys)
access by index	✅	✅
auto-sorted				✅		✅
fixed order	✅	✅
synchronized
null allowed	✅	✅	✅ just 1		✅ (1 as key, multiple as value)	✅ (only value, not key)
excels at	add/remove/ contains	stack operations	add/remove/ contains	find first, last, range queries, closest elements	get, put, lookup, large collections	finding first, next, range queries, closest element, large collections, case-insensitive key comparisons