Kotlin uses == for equality (that is, calls equals internally) and === for referential identity.
==
equals
===
Java | Kotlin | —— | —— |a.equals(b); | a == b |a == b; | a === b |a != b; | a !== b |
a.equals(b);
a == b
a == b;
a === b
a != b;
a !== b
See: https://kotlinlang.org/docs/reference/equality.html