data structures - Multiple Keys to Single Value Map Java -

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i think question similar one: how implement map multiple keys? important difference. in question (if understanding of correct, please let me know if isn't), keys supposed unique. want have map in form: mymap keys aren't unique. if doesn't make sense, want 2 dimensional array, rather refering elements coordinates, want refer them pairs of objects.

anyone have ideas either library works or way implement myself? far libraries go, i've looked @ apache commons , guava, neither seem have want.

the table data structure in guava seems meet requirement of refering value pair of objects.


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