Iterate through 2 dimensional array

Question

I have a  connect four board  which I simulate with a 2d array  array x  y  x x coordinate  y   y coordinate   I have to use   System out println   so I have to iterate through the rows   I need a way to iterate this way  0 0   1 0   2 0   3 0   0 1   1 1   2 1  etc  If i use the normal procedure   for  int i   0  i lt array length  i          for  int j   0  j lt array i  length  j             string    array i  j          System out println string       it doesnt work because it iterates this way  0 0   0 1   0 2   0 3  etc  The normal procedure stays in x and increments y until the end of the column  but i need to say in y and increment x until the end of the row

User · Answer

Consider it as an array of arrays and this will work for sure    int mat          10  20  30  40  50  60  70  80  90                    15  25  35  45                    27  29  37  48                    32  33  39  50  51  89                          for int i 0  i lt mat length  i              for int j 0  j lt mat i  length  j                  System out println  Values at arr   i      j    is   mat i  j

User · Answer

Simple idea  get the lenght of the longest row  iterate over each column printing the content of a row if it has elements  The below code might have some off-by-one errors as it was coded in a simple text editor     int longestRow   0    for  int i   0  i  lt  array length  i          if  array i  length  gt  longestRow          longestRow   array i  length               for  int j   0  j  lt  longestRow  j          for  int i   0  i  lt  array length  i            if array i  length  gt  j            System out println array i  j

User · Answer

These functions should work     First  cache your array dimensions so you don t have to     access them during each iteration of your for loops  int rowLength   array length           array width    of columns      colLength   array 0  length        array height    of rows          This is your function     Prints array elements row by row var rowString    quot  quot   for int x   0  x  lt  rowLength  x            x is the column s index     for int y   0  y  lt  colLength  y        y is the row s index         rowString    array x  y         System out println rowString             This is the one you want     Prints array elements column by column var colString    quot  quot   for int y   0  y  lt  colLength  y             y is the row s index     for int x   0  x  lt  rowLength  x         x is the column s index         colString    array x  y         System out println colString     In the first block  the inner loop iterates over each item in the row before moving to the next column   In the second block  the one you want   the inner loop iterates over all the columns before moving to the next row   tl dr  Essentially  the for   loops in both functions are switched  That s it   I hope this helps you to understand the logic behind iterating over 2-dimensional arrays   Also  this works whether you have a string    or string

User · Answer

This is The easiest I can Imagine        You need to just change the order of Columns and rows   Yours is printing columns X rows and the solution is printing them rows X columns  for int rows 0 rows lt array length rows         for int columns 0 columns  lt array rows  length columns             System out print array rows  columns      t          System out println

User · Answer

Just change the indexes  i and j    in the loop  plus if you re dealing with Strings you have to use concat and initialize the variable to an empty Strong otherwise you ll get an exception   String string     for  int i   0  i lt array length  i         for  int j   0  j lt array i  length  j             string   string concat array j  i             System out println string

User · Answer

Just invert the indexes  order like this   for  int j   0  j lt array 0  length  j          for  int i   0  i lt array length  i       because all rows has same amount of columns you can use this condition  j  lt  array 0  lengt in first for condition due to the fact you are iterating over a matrix

[java] Iterate through 2 dimensional array

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