Question

Is there any magic hanging around anywhere that could mean that

(object0 == object1) != (object0.equals(object1))

where object0 and object1 are both of a certain type which hasn’t overridden Object.equals()?

Answer 1

No. That’s exactly the definition of Object.equals().

…this method returns true if and only if x and y refer to the same object (x == y has the value true) …

public boolean equals( Object o ) { 
   return this == o;
}