asmhatreandClaude Sonnet 5
f59c1de96d
Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
23 lines
1.1 KiB
Plaintext
23 lines
1.1 KiB
Plaintext
$ java --enable-preview LazyDemo (JDK 27)
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--- a lazy constant computes once, on first use
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toString before first get(): jdk.internal.lang.LazyConstantImpl@...[computing function=LazyDemo$$Lambda/0x...@...]
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(loading settings on main)
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toString after first get(): jdk.internal.lang.LazyConstantImpl@...[Settings[region=ap-south-1, poolSize=16]]
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CHECK ok : get() returns the same instance every time
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CHECK ok : the supplier ran exactly once
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--- and once even when 64 threads race for it
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CHECK ok : 64 racing threads triggered exactly one initialisation
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--- List.ofLazy: each element is computed on first access
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computed so far: 0
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squares.get(3) = square(3)=9
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squares.get(3) = square(3)=9 (second read)
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CHECK ok : only element 3 was ever computed
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--- Map.ofLazy: the keys are fixed, the values are computed on first access
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lengths.get("gamma") = 5
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CHECK ok : only the requested key's value was computed
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--- Set.ofLazy (new in 27): membership is decided by a predicate, on demand
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primes.contains(7) = true, primes.contains(6) = false
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CHECK ok : the lazy set answers membership using the predicate
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primes = [2, 3, 5, 7]
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exit=0
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