[dunnage88]

I am making a hotel booking system and can only take bookings in the month of April. I am having trouble creating the booking calendar and am using a 2d array for the month April I am not sure if this is a good way or not if so could somebody advise me. I want to print the array out so it has the dates like so:

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


Here is my code:

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package ofi;

/**
*
* @author Adam2_000
*/
public class BookingCalendar {


public static void main(String[] args) {


int[][] april = new int[5][7];

//First Row

april[0][0] = 1;
april[0][1] = 2;
april[0][2] = 3;
april[0][3] = 4;
april[0][4] = 5;
april[0][5] = 6;
april[0][6] = 7;

//Second Row

april[1][0] = 8;
april[1][1] = 9;
april[1][2] = 10;
april[1][3] = 11;
april[1][4] = 12;
april[1][5] = 13;
april[1][6] = 14;

//Third Row

april[2][0] = 15;
april[2][1] = 16;
april[2][2] = 17;
april[2][3] = 18;
april[2][4] = 19;
april[2][5] = 20;
april[2][6] = 21;

//Fourth Row

april[3][0] = 22;
april[3][1] = 23;
april[3][2] = 24;
april[3][3] = 25;
april[3][4] = 26;
april[3][5] = 27;
april[3][6] = 28;

//Fifth Row

april[4][0] = 29;
april[4][1] = 30;



System.out.print(april);
}
}

This post has been edited by jon.kiparsky: 14 November 2012 - 02:17 PM
Reason for edit:: added code tags - please use code tags and format your code nicely!

[WolverineX]

This is the algorithm to print 2D Arrays.

for (int i =0; i <= 3; i++) {
for (int j = 0; j <= 6; j++) {
System.out.print(" " + april[i][j]);
}
System.out.println("");
}

And for the fourth row

System.out.println(april[4][0] + " " + april[4][1]);

[jon.kiparsky]

Java includes some syntactic sugar to print some vanilla arrays, but not 2D arrays. Frankly, it's easier to just loop through the array and print it yourself than to try to remember what's going to print how. Do it as a method, so you can reuse the code. Something like this should work, but I haven't tested it. It'll give you the idea, anyway.

private String monthToString(int[][] month){
  StringBuilder sb = new StringBuilder();
  for (int[] row: month){
    for (int i: row){
      sb.append(i + ",");
    }
    sb.replace(sb.length()-1, sb.length(), "\n"); // replace last comma with newline
  }
  return sb.toString();
}

EDIT: notice that I write this to return a String rather than just printing it. This allows you to do what you like with the String - you might want to write it to a file or put it into a GUI element or something, so this gives you some flexibility.

This post has been edited by jon.kiparsky: 14 November 2012 - 02:28 PM

[g00se]

Why a 2d array? Can't you just do something like

       int numberOfDaysInMonth = 30;

        for (int i = 1; i <= numberOfDaysInMonth; i++) {
            System.out.printf("%3d", i);

            if ((i % 7) == 0) {
                System.out.println();
            }
        }

[pbl]

I am afraid the decision of using a 2D array here is useless.
The idea of representing a month in 4 or 5 rows as in a calendar is a commodity for human beings but completly useless for a computer.
Your April array should be a single dimenion array with 30 slots.

Later on, when it will be time to print it may be you can add a \n at each % 7 == 0 or something like that

[dunnage88]

Ah okay I see now thanks a lot guys that has helped greatly!