Quote: only refer to an object's class when creating it; use interfaces elsewhere

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Item 34: Refer to objects by their interfaces … If appropriate interface types exist, parameters, return values, … to refer to an object's class is when … If you get into the habit of using … For example, the first declaration [Vector subscribers] could be … to work.   Google-1   Google-2

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Additional Titles

Quote: use interface types for parameters, return values, variables, and fields

Related Topics

Topic: object-oriented classes (67 items)
Topic: interface type (50 items)
Topic: object-oriented fields (28 items)
Group: parameters   (10 topics, 145 quotes)
Topic: local declaration of data (11 items)