MemorySegment is a value-based class. Comparing MemorySegment instances using == or != is bug-prone because MemorySegment implementations may not be unique for the same underlying memory. Use Objects.equals() (or .equals() if the receiver is known to be non-null) instead.

For example:

MemorySegment seg = ...;
if (seg == MemorySegment.NULL) { // reference equality
  ...
}

should be:

MemorySegment seg = ...;
if (Objects.equals(seg, MemorySegment.NULL)) { // value equality
  ...
}

Reference equality between any two MemorySegment instances (e.g., a == b) is flagged by this check, and Objects.equals(a, b) is the preferred alternative.

See also https://bugs.openjdk.org/browse/JDK-8381012