Java 2d array formatting?

Question

I there, I am having problems formatting this 2d array. I was thinking about doing system.out.printf, but every time I do something like maybe %2f or something like that it doesn't work.

  public static void main(String[] args) {
    int t,i;
    int[][] table = new int[5][6];

    for (t = 0; t < 5; t++) {
        for (i=0;i < 6; i++) {
            table[t][i] = (t*6)+i+1;
            System.out.print(table[t][i] + "  ");
        }
        System.out.println();
    }

}

}

This is the 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

The output should have the spaces perfectly aligned like this : http://prntscr.com/6kn2pq

You could use \t if the numbers are not too big.

tourniquet_grab
– tourniquet_grab

2015-03-24 05:13:37 +00:00
Commented Mar 24, 2015 at 5:13 — tourniquet_grab
– tourniquet_grab, Commented Mar 24, 2015 at 5:13

MadProgrammer · Accepted Answer · 2015-03-24 05:16:00Z

1

Take a look at PrintStream#printf and String#format and Formatted Strings

Basically, for each row, each column needs to be formated to allow for a minimum of two spaces...

System.printf("%2d", table[t][i])

The next problem comes from the fact that the proceeding columns need extra space inbetween them ;)

System.printf("%2d%4s", table[t][i], "")

Which can result in something like...

 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

answered Mar 24, 2015 at 5:16

MadProgrammer

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2 Comments

user85421 Over a year ago

or just add the spaces in the format ...printf("%2d ",... not that harder to read (eventually easier if having more fields).

MadProgrammer Over a year ago

@CarlosHeuberger Depends on your requirements, I find using %4s this way is easier to read in code, but that's me

Robby Cornelissen · Accepted Answer · 2015-03-24 05:22:18Z

0

Use format like this:

System.out.format("%4d", table[t][i]);

The output then looks like this:

   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

Or if you prefer to have the numbers aligned to the left:

System.out.format("%-4d", table[t][i]);

Which results in this 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

edited Mar 24, 2015 at 5:22

answered Mar 24, 2015 at 5:15

Robby Cornelissen

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Comments

Masudul · Accepted Answer · 2015-03-24 05:15:24Z

0

You should use printf instead of print

System.out.printf("%3d", table[t][i]);

answered Mar 24, 2015 at 5:15

Masudul

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Tyler2P · Accepted Answer · 2023-06-13 10:38:52Z

0

You can take my handle

for (t = 0; t < 5; t++) {
  for (i=0;i < 6; i++) {
    table[t][i] = (t*6)+i+1;
    if (table[t][i] > 9)
      System.out.print(table[t][i] + " ");
    else
      System.out.print(table[t][i] + "  ");
  }
  System.out.println();
}

edited Jun 13, 2023 at 10:38

Tyler2P

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answered Jun 12, 2023 at 3:05

Omar Alnhdi

1

1 Comment

Tyler2P Over a year ago

Your answer could be improved by adding more information on what the code does and how it helps the OP.

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