Posted By: Anonymous
I wanted to clarify if I understand this correctly:
==is a reference comparison, i.e. both objects point to the same memory location
.equals()evaluates to the comparison of values in the objects
In general, the answer to your question is “yes”, but…
.equals(...)will only compare what it is written to compare, no more, no less.
- If a class does not override the equals method, then it defaults to the
equals(Object o)method of the closest parent class that has overridden this method.
- If no parent classes have provided an override, then it defaults to the method from the ultimate parent class, Object, and so you’re left with the
Object#equals(Object o)method. Per the Object API this is the same as
==; that is, it returns true if and only if both variables refer to the same object, if their references are one and the same. Thus you will be testing for object equality and not functional equality.
- Always remember to override
hashCodeif you override
equalsso as not to “break the contract”. As per the API, the result returned from the
hashCode()method for two objects must be the same if their
equalsmethods show that they are equivalent. The converse is not necessarily true.