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javademos/java21-features/output/04-sequenced-collections.txt
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$ javac src/SequencedCollectionsDemo.java && java SequencedCollectionsDemo (21.0.12.1)
getFirst/getLast: a c
reversed view : [c, b, a]
addFirst+removeLast: [z, a, b]
LinkedHashSet reversed: [3, 2, 1]
firstEntry/lastEntry : x=1 z=3
putFirst : {w=0, x=1, y=2, z=3}
reversed map : {z=3, y=2, x=1, w=0}
view sees add : [3, 2, 1]
immutable list : UnsupportedOperationException
HashSet : no getFirst (unordered)