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  1. #1
    DrMath is offline Member
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    Sep 2009
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    Default == is same as .equals()??

    == is same as .equals() ??

    Hi, i not sure how are they different?
    Understanding now is that one looks in deeper when doing the compare?
    Any good examples i can reference?

  2. #2
    pbrockway2 is offline Moderator
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    Feb 2009
    New Zealand
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    Equality - as Orwell famously observed - is a matter of interpretation.

    Say you found a $100 note in the street and, the next day, found the same thing. Are they really "the same"? Mostly we would say they are: they both have the same value and all that matters with banknotes is that value. They are equal.

    Not so if were worried about the actual - physical - bank notes themselves. If they were stolen in a robbery, say. Then it might be very significant if a $100 note spent by a "suspect" as "the same as" one of the stolen ones.

    In general the class itself will define what "equality" - or being the same - means. It does this with its .equals() method.

    == tests whether two references refer to the same object in a very strong sense: that of identity. If the objects were created with different uses of "new" then they will not compare equal with ==. This test has nothing to do with what the type itself defines equality to be.
    Last edited by pbrockway2; 09-30-2009 at 05:00 AM.

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