How do collections expand?

Does anyone have an explanation of how, from the hardware perspective, collections manage to just keep expanding if required after they have been instantiated? I am wondering because with normal arrays or memalloc memory is allocated or reserved a fixed amout of physical memory size when declared and cannot be increased.
Chris

georgemc wrote:
They just do. No, I'm not being flippant, that's all you need to knowI disagree. I think it's worth knowing how collections can expand, though it's not that important to know how these particular implementations do it.
@OP: When you download the JDK, there's a file src.zip that contains the source code for the core APIs. Look in there to see how java.util.ArrayList and java.util.LinkedList work.

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