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I'm implementing an interface that has functionality similar to a table that can contain an types of objects. The interface specifies the following function: double[] getDoubles(int columnIndex); Where I'm stumped is that in my implementation, I'm storing the table data in a 2D Object array ( Object[][] data ). When I need to return the values, I want to do the following (it is assumed that getDoubles() will only be called on a column that contains doubles, so there will be no ClassCastExceptions ): double[] getDoubles(int columnIndex) { return (double[]) data[columnIndex]; } But - Java doesn't allow Object[] to be cast to double[] . Casting it to Double[] is ok because Double is an object and not a primitive, but my interface specifies that data will be returned as a double[] . So I have two questions: Is there any way I can get the column data out of the Object[][] table and return the array of primitives? If I do change the interface to return Double[] , will there be any performance impact?

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