This ruleset is used in Princeton COS 226 and Coursera (.*/)?\.workspace/.* (.*/)?\.output/.* (.*/)?old/.* (.*/)?save/.* (.*/)?(PatriciaST|PatriciaSET|SegmentTree|FenwickTree).java (.*/)?(IndexFibonacci|IndexBinomial|IndexMultiway|Multiway|Binomial|Fibonacci)MinPQ.java (.*/)?Eps(Document|Graphics2D).java Special check for Board.java to see if student defines more than one array instance variable. 3 1] ]]> Calling Arrays.equals() with a two-dimensional array is likely a bug. Using Arrays.deepEquals() was probably intended. This test is fragile - it tests only that Board defines a 2D instance variable and that it calls Arrays.equals() on some array (but not necessarily a 2D array). 3 0] //PrimaryExpression/PrimaryPrefix/Name[@Image='Arrays.equals'] ]]> Prohibit non-private instance (or static) variables. The one exception is non-private fields defined in private nested classes, for which the access modifier is not relevant. 1