Claude
682b7b067c
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b66uwsWr9B1ouyrzUh
24 lines
757 B
Plaintext
24 lines
757 B
Plaintext
== generated equals/hashCode ==
|
|
a.equals(b) = true
|
|
a.hashCode() == b.hashCode() = true
|
|
new HashSet of both, size = 1
|
|
a == b = false
|
|
|
|
== array component: reference equality ==
|
|
w1.equals(w2) = false
|
|
same array shared: true
|
|
|
|
== mutable List component: equals works, hashCode can change ==
|
|
hashCode before = 4714, after list.add(3) = 34537
|
|
record in HashSet, list mutated -> contains = false
|
|
|
|
== doubles compare with Double.compare semantics ==
|
|
NaN record equals NaN record = true
|
|
Double.NaN == Double.NaN = false
|
|
0.0 record equals -0.0 record = false
|
|
0.0 == -0.0 = true
|
|
|
|
== overriding equals in a record ==
|
|
t1.equals(t2) = true
|
|
toString still shows both fields: Tagged[isbn=1, title=Effective Java 3e]
|