How to make a 2D array of coordinates based on a 2D array "map"

Question

The for loops appear to be reading my list incorrectly. How can I rewrite this to get to the desired output? Any help or corrections is appreciated!

    public static String[][] map2 = {{"-","#","#"},
                                     {"#","-","-"},
                                     {"#","D","#"}};

    public static int[][] readMap(String[][] map){
        int[][] wallAt = new int[map.length * map[0].length][2];   
        for(int y = 0; y < map.length ; y++){                   
            for(int x = 0; x < map.length; x++){               
                if(map[x][y].equals("#")){                     
                    wallAt[x][0] = x;                          
                    wallAt[x][1] = y;
                }  
                else{              
                    wallAt[x][0] = 999;
                    wallAt[x][1] = 999;
                }
            }
        }
        return wallAt;                                             
    }   

Using:

    public static void test2DArray(int[][] s){   
        for(int[] i : s){                      
            for(int j : i){
                System.out.print(j + " ");
            }
            System.out.print("\n");
        }    
    }

To print out wallAt,
I would expect:

999 999            
0 1  
0 2  
1 0  
999 999  
999 999  
2 0  
999 999  
2 2  

What I get:

0 2  
999 999  
2 2  
0 0  
0 0  
0 0  
0 0  
0 0  
0 0  

Answer 1

Everything is OK except that you didn't go pass array[2][1] at all with your code. What you need is to implement a counter, because you had made 2d array out of multidimensional-array, and 2d-array should be in the form array[counter][0] and array[counter][1] respectively, something like:

public static int[][] readMap(String[][] map){
        int counter = 0;
        int[][] wallAt = new int[map.length*map[0].length][2];   
        for(int x = 0; x < map.length ; x++){                   
            for(int y = 0; y < map[x].length; y++){    
                if(map[x][y].equals("#")){
                    wallAt[counter][0] = x;
                    wallAt[counter][1] = y; 
                }  
                else{              
                    wallAt[counter][0] = 999;
                    wallAt[counter][1] = 999;
                }

                counter++;           
            }
        }
        return wallAt;                                             
    }