What is the unique ID (identifier) for a Google GData ContactEntry object?

Is there a unique identifier for the Google GData ContactEntry object? Basically, if there are two entries with names "Andy Lim" for example, we need to distinguish the entries and what is the identifier that can be used. Also, if we copy the contactentry to contacts folder in another google account, will the identifier stays the same, or will it change?

Re开发者_如何学JAVAgards, Dicky

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According to ContactEntry API documentation, the ContactEntry class extends google.gdata.atom.Entry, where it inherits a getId() method.