• Applying the == operator to boxed primitives is almost always wrong, because the == operator is an identity comparison, i.e. for objects, the == operator compares the memory addresses of the objects.
  • e.g. sample code
• Avoid unnecessary autoboxing, i.e. unnecessary object creations.
  • e.g. Long sum = 0L; sum += 1; will auto-unbox sum, then autobox the incremented value into a new Long object; instead, use long sum to avoid unnecessary autoboxing.

Issue