asmhatreandClaude Sonnet 5.5
f6237d4117
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b6NtPJHrkan4BXhCAM
32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
$ java -cp target/classes com.ankurm.reflection.MethodHandlesDemo
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== 1. Look up once, call many times ==
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twice(21) = 42
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balance() = 50
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handle type = (Account)long
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== 2. invokeExact is exact; invoke adapts ==
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invokeExact, wrong return type -> WrongMethodTypeException
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handle's method type (Account)long but found (Account)Object
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invoke (boxing) = 50 (Long)
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== 3. Handles compose ==
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bindTo(acct) = 50
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after deposit10 = Account[erin, 60]
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balance as text = "60"
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== 4. Access is checked when you look up, not when you call ==
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findVirtual(private) -> IllegalAccessException
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no such method: com.ankurm.reflection.Account.secret()String/invokeVirtual
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privateLookupIn -> secret-of-erin
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privateLookupIn(String) -> IllegalAccessException
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module java.base does not open java.lang to unnamed module @135fbaa4
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== 5. VarHandle: typed, atomic field access ==
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get = 60
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CAS(60 -> 100) = true, balance now 100
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CAS(60 -> 200) = false, balance now 100
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getAndAdd(5) = was 100, now 105
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set on final field -> UnsupportedOperationException
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array element CAS-able: counts[1] = 7
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