wavePrintColumnWise

#1
#2

What is your doubt, please specify?

#3
#4

check this one i have updated it

#5

There is just a small mistake here:

for (int i = 0; i < arr[i].length; i++)

Here you have made i<arr[i].length but you have just re-initialized ā€˜iā€™ to 0 in the for loop and it keeps changing for every iteration. So it will give array index out of bounds exception. You can change this to :

for (int i = 0; i < arr[0].length; i++)