[java programming] Interfaces lesson - question

Thu, 26 Feb 2009 13:50:13 -0800

In http://www.javapassion.com/javase/javainterface.pdf page 21 it says

Interfaces and classes are both types
– This means that an interface can be used in places
where a class can be used
– For example:
// Recommended practice               <<----
PersonInterface pi = new Person();  <<----
// Not recommended practice          <<----
Person pc = new Person();             <<----

Why would it be the recommended practice to type a new object by its interface name?

Tanya

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