menna menna - 1 year ago 72
Java Question

Java looping two-dimensional array with if conditions

I'm trying to do a certain project and there is this part in which I want to loop in a two-dimensional (2D) array and if the certain value of

then do something.

To be more specific my 2D array is defined for files and users (the attached photo might explain well); I want, for example, when
i = 0
j = 0
then print out that user
can write in file. I was able to iterate over the array and find the indexes where
's occur in the array with the following code:

my 2d array defined

public class Test {
public int counteri = 0;
public int counterj = 0;

public void readpermission(int[][] array) {
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 6; j++) {
if (array[i][j] == 1) {
counterj = j;
counteri = i;
System.out.println("found 1's at index =" + counteri + " " + counterj);

found 1's at index =0 0,

found 1's at index =0 1

found 1's at index =0 4

found 1's at index =1 1

found 1's at index =1 2

found 1's at index =1 3

found 1's at index =1 4

found 1's at index =1 5

When the first value is
0 0
, I want an output that user
can write in file
and when the output is
0 1
I want an output stating that user
can read in file 1...and so on.

Answer Source

Given your last comment:


could be

if (i==0 && j==0 && array[i][j] == 1)

But the point is: that is really basic java syntax; and you should not need to come here and ask about that. Instead: you study tutorials and education materials that tells you how to do work with java syntax, for example here.

But please note: the whole thing that you are describing doesn't make too much sense. You are using int values to model permissions. That is not a good idea. Instead: you could create your own Permission class; or at least: use an enum instead of int values. Assuming that an int with value 1 ... means "write access" is simply a very naive and actually not-at-all intuitive model.

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