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Mmm, that's not particularly true. An ArrayList can hold more for a given memory size than a LinkedList because LinkedList nodes require at least 1 pointer on top of each element to hold the address...

Oh yeah, and as a side note, you want to pick better names. Names such as l or al give the programmer(s) no inclination to what that variable is being used for. Even if you named the variables list...

Depends on the application.

Use the List if you want to allow anything that resembles a list as that variable. Otherwise if you want to limit it to a specific type of list (ArrayList or...