Initialize 2D array

Question

I am trying to initialize a 2D array  in which the type of each element is char  So far  I can only initialize this array in the follow way     public class ticTacToe    private char     table   public ticTacToe         table 0  0     1       table 0  1     2       table 0  2     3       table 1  0     4       table 1  1     5       table 1  2     6       table 2  0     7       table 2  1     8       table 2  2     9         I think if the array is 10 10  it is the trivial way  Is there any efficient way to do that

User · Answer

You can use for loop if you really want to.

char table[][] table = new char[row][col];
for(int i = 0; i < row * col ; ++i){
     table[i/row][i % col] = char('a' + (i+1));
}

or do what bhesh said.

User · Answer

Easy to read type     table   new char              0123456789  toCharArray          abcdefghij  toCharArray

User · Answer

How about something like this   for  int row   0  row  lt  3  row         for  int col   0  col  lt  3  col            table row  col     char    1    row   3   col     The following complete Java program   class Test       public static void main String   args            char     table   new char 3  3           for  int row   0  row  lt  3  row                 for  int col   0  col  lt  3  col                    table row  col     char    1    row   3   col            for  int row   0  row  lt  3  row                 for  int col   0  col  lt  3  col                    System out println  table row  col              outputs   1 2 3 4 5 6 7 8 9   This works because the digits in Unicode are consecutive starting at  u0030  which is what you get from  0     The expression  1    row   3   col  where you vary row and col between 0 and 2 inclusive  simply gives you a character from 1 to 9   Obviously  this won t give you the character 10  since that s two characters  if you go further but it works just fine for the 3x3 case  You would have to change the method of generating the array contents at that point such as with something like   String     table   new String 5  5   for  int row   0  row  lt  5  row         for  int col   0  col  lt  5  col            table row  col    String format   d   row   5   col   1

User · Answer

You can follow what paxdiablo on Dec  12  suggested for an automated  more versatile approach    for  int row   0  row  lt  3  row     for  int col   0  col  lt  3  col        table row  col     char    1    row   3   col     In terms of efficiency  it depends on the scale of your implementation  If it is to simply initialize a 2D array to values 0-9  it would be much easier to just define  declare and initialize within the same statement like this  private char     table      1    2    3      4    5    6      7    8    9      Or if you re planning to expand the algorithm  the previous code would prove more  efficient

User · Answer

Shorter way is do it as follows   private char     table      1    2    3      4    5    6      7    8    9

[java] Initialize 2D array

Examples related to java

Examples related to multidimensional-array