On 1/5/2012 4:42 PM, Friedrich Clausen wrote:
Hello,
In section 1.2, in exercise program Set-HashSet-FindDup we declare a
new HashSet like so -
Set s = new HashSet();
but I notice that
HashSet s = new HashSet();
also works. What is the recommended way to create a new HashSet
instance?
This is indeed a very important question - "When do you want to use
an Java interface as opposed to implementation class as a reference type?"
(This issue has been discussed in "Java interface" topic by the way.)
In general, you want to use Interface as opposed to an implementation
mainly because the implementation can change without affecting
the user of the interface, thus provides more flexible and agile
architecture.
-S
Thanks!
Fred.
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