printing out a 2-D array in Matrix format

Question

How can I print out a simple int      in the matrix box format like the format in which we handwrite matrices in  A simple run of loops doesn t apparently work  If it helps i m trying to compile this code in a linux ssh terminal   for  int i   0  i  lt  rows  i          for  int j   0  j  lt  cols  j              System out println matrix i  j                    System out println

User · Answer

public static void printMatrix double     matrix        for  double   row   matrix            for  double element   row                System out printf   5 1f   element                     System out println                Function Call  printMatrix new double     2 0 0   0 2 0   0 0 3       Output     2 0  0 0  0 0   0 0  2 0  0 0   0 0  0 0  3 0     In console

User · Answer

int     matrix              1 2 3            4 5 6            7 8 9               use foreach loop as below to avoid IndexOutOfBoundException       need to check matrix    null if implements as a method       for each row in the matrix     for  int   row   matrix              for each number in the row         for  int j   row                System out print j                           System out println

User · Answer

int     matrix          1 2 3        4 5 6        7 8 9        10 11 12      printMatrix matrix    public void printMatrix int     m       try          int rows   m length          int columns   m 0  length          String str      t            for int i 0 i lt rows i                 for int j 0 j lt columns j                     str    m i  j      t                              System out println str                     str      t                   catch Exception e  System out println  Matrix is empty           Output       1   2   3         4   5   6         7   8   9         10  11  12

User · Answer

In java8 fashion   import java util Arrays   public class MatrixPrinter        public static void main String   args            final int     matrix   new int 4  4           printMatrix matrix              public static void printMatrix int     matrix            Arrays stream matrix           forEach               row  - gt                    System out print                       Arrays stream row                   forEach  el  - gt  System out print       el                          System out println                                           this produces    0  0  0  0     0  0  0  0     0  0  0  0     0  0  0  0     but since we are here why not make the row layout customisable   All we need is to pass a lamba to the matrixPrinter method   import java util Arrays  import java util function Consumer   public class MatrixPrinter        public static void main String   args            final int     matrix   new int 3  3            Consumer lt int   gt  noDelimiter    row  - gt                Arrays stream row  forEach  el  - gt  System out print       el                      System out println                        Consumer lt int   gt  pipeDelimiter    row  - gt                Arrays stream row  forEach  el  - gt  System out print        el                      System out println                           Consumer lt int   gt  likeAList    row  - gt                System out print                   Arrays stream row               forEach  el  - gt  System out print       el                      System out println                           printMatrix matrix  noDelimiter           System out println            printMatrix matrix  pipeDelimiter           System out println            printMatrix matrix  likeAList               public static void printMatrix int     matrix  Consumer lt int   gt  rowPrinter            Arrays stream matrix           forEach  row  - gt  rowPrinter accept row               this is the result     0  0  0   0  0  0   0  0  0     0   0   0     0   0   0     0   0   0      0  0  0     0  0  0     0  0  0

User · Answer

To properly format numbers in columns  it s best to use printf  Depending on how big are the max or min numbers  you might want to adjust the pattern   4d   For instance to allow any integer between Integer MIN VALUE and Integer MAX VALUE  use   12d    public void printMatrix int     matrix        for  int row   0  row  lt  matrix length  row              for  int col   0  col  lt  matrix row  length  col                  System out printf   4d   matrix row  col                      System out println              Example output    36 913 888 908 732 626  61 237   5   8  50 265 192 232 129 307

User · Answer

public class Matrix       public static void main String   args             double Matrix                   0 1 0 2 0 3 0 4             0 1 1 1 2 1 3 1             0 2 1 2 2 2 3 2             0 3 1 3 2 3 3 3                  int i j        for i 0 i lt 4 i                     for j 0 j lt 4 j                System out print Matrix  i   j                   System out println

User · Answer

public static void main String   args                          int       ar                                              12 33 23                            34 56 75                            14 76 89                            45 87 20                           I prefer using enhanced loop in Java   Since our ar is an array of array  2D   So  when you iterate over it  you will first get an array  and then you can iterate over that array to get individual elements                for int   num  ar                                  for int ele   num                                      System out print      ele                                       System out println

User · Answer

final int     matrix         1  2  3        4  5  6        7  8  9       for  int i   0  i  lt  matrix length  i          for  int j   0  j  lt  matrix i  length  j              System out print matrix i  j                    System out println        Produces   1 2 3 4 5 6 7 8 9

User · Answer

Here s my efficient approach for displaying 2-D integer array using a StringBuilder array   public static void printMatrix int     arr        if  null    arr    arr length    0               empty or null matrix         return             int idx   -1      StringBuilder   sbArr   new StringBuilder arr length        for  int   row   arr            sbArr   idx    new StringBuilder    t             for  int elem   row                sbArr idx  append elem     t                       sbArr idx  append                  for  int i   0  i  lt  sbArr length  i              System out println sbArr i              System out println   nDONE n

[java] printing out a 2-D array in Matrix format

Function Call

Output:

In console:

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