This community-built FAQ covers the “Traversing 2D Arrays: Introduction” exercise from the lesson “2D Arrays: Java”.
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Happy New Year everyone!
Really hoped to finish this course by the end of 2020, but made only to Learn Java[ 11 ][ 6 ] (or [ 10 ][ 5 ] when taking into account that indeces start from 0).
The third exercise:
Store the number of columns in
intMatrix into a variable called
columns and the number of rows in
intMatrix into a variable called
was a bit confusing, because I couldn’t understand why I would I do something twice (since the same thing was covered in exercises 1 and 2).
And I’m sure glad that Java wasn’t my first language to learn. There is a great deal of mindbending with all the classes, constructors, polymorphism keywords and boilerplate code.
this lesson in particular was really well fleshed out. But there is a lot of seemingly obsolete content. I reads like you try to explain the concept of nested loops 3 more times after the last lesson. I personally find it pretty easy to grasp. Maybe that is just me.
I really wished you would have put more afford like this in other more complex topics like polymorphism.
I am confused with intMatrix.length and intMatrix.length, because they both print “5”. So why are there two different formats if they are asking for the same thing? Thanks!
intMatrix.length do not refer to the same thing.
intMatrix is an array of arrays of integers.
intMatrix.length is the length of the “outer” array - it tells you how many arrays are in
intMatrix is the first array in
intMatrix (meaning the array at an index of zero for
intMatrix.length is the length of this “inner” array - which is how many integers there are in
Thanks so much for your detailed answer! It makes sense to me now!
I just realized that I made a mistake on the printout, I literally asked it to print the same thing, that’s why they both printed 5…