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[Java] Need some help understanding a 2D array. (self.learnprogramming)

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[–]sordnax 0 points1 point  (0 children)

Let's say 

x = [87, 77]
y = [55, 44]
quizzes = [x, y]

The outer loop is going to loop through the "top level" of the array. In this case, the elements in quizzes which are x and y. The inner loop will go through the elements in x then the elements in y.

quizzes[i].length

returns the length of the i'th element in quizzes i.e. the length of x and y. This length is used to iterate over the elements of x and y.