Seasoned Java programmers are programming to interfaces. What does that mean?

You can read the first example as follows: “I want to declare a variable customers that will have all access to all API offered by the class ArrayList“. The second version means the following: “I want to declare a variablecustomers that has a behavior declared in the List interface”. The first example declares a variable of a specific implementation of the List interface – ArrayList. Now take a look at this code example:



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