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Message: [QUOTE="Patricia Shanahan, post: 619765"] int i[][] is not an array of int. It is an array of references to arrays of int, so you were looking at the wrong part of the documentation. To compare, for example, i[0] to j[0], Arrays.equals will use (i[0]==null ? j[0]==null : i[0].equals(j[0])), which is false unless i[0] and j[0] are either both null or are references to the same object. A lot of Java books confuse two different concepts: 1. Arrays of array references, which Java does have. 2. Multidimensional arrays, which it does not have and for which arrays of array references are a rough approximation. If i and j were two-dimensional arrays of int, they would have the same size, and the same elements, in the same order, so they should be equal. They are not equal because they are really arrays of references to different arrays of int. Patricia [/QUOTE]