arrays in java

can someone tell me how to copy a 2 dimensional array to a 1 dimensional one? Ie.
array:
{2, 3, 5}
{4, 7, 9}
should become {2, 3, 5, 4, 7, 9}

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Meanwhile, the Python guy did:

ConvertArray = lambda x: itertools.chain(*x)

and it works with kind of data types (including more arrays, and mixed types).