20 lines
1.4 KiB
Plaintext
20 lines
1.4 KiB
Plaintext
=== Both reject null, same as List.of ===
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ImmutableList.of("a", null, "c") threw NullPointerException - same as List.of
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=== Guava's builder tolerates a size that grows past what you declared; List.of has no builder ===
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ImmutableList.builder() result = [1, 2, 3, 4, 5]
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-> java.util has no equivalent builder; you either know all elements up front for List.of(...)
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or you build an ArrayList and call List.copyOf(...) at the end - this demo's RecordDemo does exactly that.
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=== Element limit: List.of has none in practice; the old Arrays.asList(E...) varargs ceiling is long gone ===
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List.of(... 5000 elements ...).size() = 5000 (List.of(E...) switched to a varargs array long ago - the old 1-10 overloads are just JIT-friendlier for small sizes)
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=== Guava's ImmutableList also exposes a reverse() view and asList() - conceptually close to JEP 431's reversed() ===
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built.reverse() = [5, 4, 3, 2, 1] (Guava's reverse() predates java.util's reversed() by over a decade)
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=== Where they genuinely differ: Guava's collections are NOT in java.base, so they ship as a real dependency ===
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Adding Guava to a project to get ImmutableList today mostly buys you nothing List.of/List.copyOf
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doesn't already give you for the collection types themselves - the builder pattern above is the
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real remaining reason, plus ImmutableList/ImmutableMap/ImmutableSet having first-class equivalents
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for ImmutableMultimap, ImmutableTable and other Guava-only collection types the JDK has no analog for.
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