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immutable: List.of vs unmodifiableList vs copyOf - null handling, views vs copies, JMH wrap/copy overhead, a Guava comparison, and the record defensive-copy trap

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asmhatre
2026-10-01 11:32:13 +00:00
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Benchmark (size) Mode Cnt Score Error Units
ImmutableOverheadBenchmark.construct_guavaImmutableListCopyOf 10 thrpt 6 16108.571 ± 1054.221 ops/ms
ImmutableOverheadBenchmark.construct_guavaImmutableListCopyOf 1000 thrpt 6 1532.302 ± 53.937 ops/ms
ImmutableOverheadBenchmark.construct_listCopyOf 10 thrpt 6 14442.559 ± 783.408 ops/ms
ImmutableOverheadBenchmark.construct_listCopyOf 1000 thrpt 6 372.757 ± 63.463 ops/ms
ImmutableOverheadBenchmark.construct_unmodifiableListWrap 10 thrpt 6 29294.827 ± 3954.701 ops/ms
ImmutableOverheadBenchmark.construct_unmodifiableListWrap 1000 thrpt 6 21757.029 ± 2062.127 ops/ms
ImmutableOverheadBenchmark.read_immutableCopy_get 1000 thrpt 6 2146.271 ± 121.977 ops/ms
ImmutableOverheadBenchmark.read_plainArrayList_get 1000 thrpt 6 2141.758 ± 115.453 ops/ms
ImmutableOverheadBenchmark.read_unmodifiableWrapper_get 1000 thrpt 6 2309.174 ± 116.629 ops/ms