How to print Two-Dimensional Array like table

Question

I m having a problem with two dimensional array  I m having a display like this   1 2 3 4 5 6 7 9 10 11 12 13 14 15 16       etc   What basically I want is to display to display it as   1 2 3 4 5 6     7   8 9 10 11 12 13 14   15 16 17 18 19 20   21 22 23 24     etc   Here is my code        int twoDm      new int 7  5       int i j k 1           for i 0 i lt 7 i                 for j 0 j lt 5 j                   twoDm i  j  k                  k                        for i 0 i lt 7 i                 for j 0 j lt 5 j                      System out print twoDm i  j                        System out print

User · Answer

A part from  djechlin answer  you should change the rows and columns  Since you are taken as 7 rows and 5 columns  but actually you want is 7 columns and 5 rows    Do this way -  int twoDm      new int 5  7    for i 0 i lt 5 i         for j 0 j lt 7 j              System out print twoDm i  j                  System out println

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You could write a method to print a 2d array like this     Displays a 2d array in the console  one line per row  static void printMatrix int     grid        for int r 0  r lt grid length  r             for int c 0  c lt grid r  length  c               System out print grid r  c                 System out println

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You need to print a new line after each row     System out print   n    or use println  etc   As it stands you are just printing nothing - System out print      replace print with println or    with   n

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I ll post a solution with a bit more elaboration  in addition to code  as the initial mistake and the subsequent ones that have been demonstrated in comments are common errors in this sort of string concatenation problem   From the initial question  as has been adequately explained by  djechlin  we see that there is the need to print a new line after each line of your table has been completed   So  we need this statement   System out println      However  printing that immediately after the first print statement gives erroneous results   What gives   1  2      n    This is a problem of scope   Notice that there are two loops for a reason -- one loop handles rows  while the other handles columns   Your inner loop  the  j  loop  iterates through each array element  j  for a given  i    Therefore  at the end of the j loop  you should have a single row  You can think of each iterate of this  j  loop as building the  columns  of your table   Since the inner loop builds our columns  we don t want to print our line there -- it would make a new line for each element   Once you are out of the j loop  you need to terminate that row before moving on to the next  i  iterate   This is the correct place to handle a new line  because it is the  scope  of your table s rows  instead of your table s columns   for i 0 i lt 7 i         for j 0 j lt 5 j              System out print twoDm i  j                    System out println        And you can see that this new line will hold true  even if you change the dimensions of your table by changing the end values of your  i  and  j  loops

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Just for the records  Java 8 provides a better alternative   int     table   new int      2 4 5   6 34 7   23 57 2     System out println Stream of table       map rowParts - gt  Stream of rowParts      map element - gt    Integer element  toString             collect Collectors joining   t          collect Collectors joining   n

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This might be late however this method does what you ask in a perfect manner  it even shows the elements in   table - like   style  which is brilliant for beginners to really understand how an Multidimensional Array looks   public static void display int x           So we allow the method to take as input Multidimensional arrays                 Here we use 2 loops  the first one is for the rows and the second one inside of the rows is for the columns         for int rreshti   0  rreshti  lt  x length  rreshti           Loop for the rows                       for int kolona   0  kolona  lt  x rreshti  length kolona              Loop for the columns                               System out print x rreshti  kolona      t                  the  t simply spaces out the elements for a clear view                              System out println         And this empty outputprint  simply makes sure each row  the groups we wrote in the beggining in seperate      is written in a new line  to make it much clear and give it a table-like look                    After you complete creating this method  you simply put this into your main method   display  arrayName       So we call the method by its name  which can be anything  does not matter  and give that method an input  the Array s name    NOTE  Since we made the method so that it requires Multidimensional Array as a input it wont work for 1 dimensional arrays  which would make no sense anyways   Source  enter link description here  PS  It might be confusing a little bit since I used my language to name the elements   variables  however CBA to translate them  sorry

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ALL OF YOU PLEASE LOOT AT IT I Am amazed it need little IQ  just get length by arr 0  length and problem solved     for  int i   0  i  lt  test length  i              for  int j   0  j  lt  test 0  length  j               System out print test i  j                  System out println

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Declared a 7 by 5 array which is similar to yours  with some dummy data  Below should do      int     array     21  12  32  14  52    43  43  55  66  72    57  64  52  57  88   52  33  54  37  82   55  62  35  17  28   55  66  58  72  28              for  int i   0  i  lt  array length  i              for  int j   0  j  lt  array i  length  j                  System out print array i  j     quot   quot                      System out println       the trick is here  print a new line after iterating first row

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If you don t mind the commas and the brackets you can simply use   System out println Arrays deepToString twoDm  replace           n

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More efficient and easy way to print the 2D array in a formatted way   Try this   public static void print int     puzzle            for  int   row   puzzle                for  int elem   row                    System out printf   4d   elem                             System out println                      System out println            Sample Output      0   1   2   3    4   5   6   7    8   9  10  11   12  13  14  15

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For traversing through a 2D array  I think the following for loop can be used           for int a    twoDm                        System out println Arrays toString a              if you don t want the commas you can string replace if you want this to be performant you should loop through a   and then print it

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public static void main String   args        int     matrix                               1  2  5                              3  4  6                             7  8  9                                 System out println      Matrix             for  int rows   0  rows  lt  3  rows              System out println   n            for  int columns   0  columns  lt  matrix rows  length  columns                  System out print matrix rows  columns      t                        This works add a new line in for loop of the row  When the first row will be done printing the code will jump in new line

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You can creat a method that prints the matrix as a table    Note  That does not work well on matrices with numbers with many digits and        non-square matrices       public static void printMatrix int size int row int     matrix                for int i   0 i  lt   7   size  i                        System out print  -                                       System out println  -                 for int i   1 i  lt   matrix row  length i                    System out printf     4d   matrix row  i - 1                                  System out println                          if row    size -  1                    when we reach the last row                  print bottom line  ---------                       for int i   0 i  lt   7   size  i                                System out print  -                                                     System out println  -                                 public static void main String   args         int     matrix                     1 2 3 4                  5 6 7 8                  9 10 11 12                  13 14 15 16                        print the elements of each row        int rowsLength   matrix length             for int k   0  k  lt  rowsLength  k                    printMatrix rowsLength k matrix                       Output     ---------------------    1    2    3    4   ---------------------    5    6    7    8   ---------------------    9   10   11   12   ---------------------   13   14   15   16   ---------------------   I created this method while practicing loops and arrays  I d rather use   System out println Arrays deepToString matrix  replace           n

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Iliya    Sorry for that   you code is work  but its had some problem with Array row and columns  here i correct your code this work correctly  you can try this     public static void printMatrix int size  int row  int     matrix         for  int i   0  i  lt  7   matrix row  length  i              System out print  -              System out println  -         for  int i   1  i  lt   matrix row  length  i              System out printf     4d    matrix row  i - 1              System out println            if  row    size - 1                when we reach the last row             print bottom line  ---------           for  int i   0  i  lt  7   matrix row  length  i                  System out print  -                      System out println  -              public static void length int     matrix         int rowsLength   matrix length       for  int k   0  k  lt  rowsLength  k               printMatrix rowsLength  k  matrix              public static void main String   args         int     matrix       1  2  5      3  4  6      7  8  9                length matrix        and out put look like  ----------------------      1      2      5   ----------------------      3      4      6   ----------------------      7      8      9   ----------------------

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public class FormattedTablePrint        public static void printRow int   row            for  int i   row                System out print i               System out print   t                      System out println               public static void main String   args            int twoDm      new int 7  5           int i j k 1           for i 0 i lt 7 i                  for j 0 j lt 5 j                      twoDm i  j  k                  k                                     for int   row   twoDm                printRow row                       Output  1   2   3   4   5    6   7   8   9   10   11  12  13  14  15   16  17  18  19  20   21  22  23  24  25   26  27  28  29  30   31  32  33  34  35     Of course  you might swap the 7  amp  5 as mentioned in other answers  to get 7 per row

[java] How to print Two-Dimensional Array like table

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