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Java string from XY coordinate map

I have a map where Coords is defined like this:

class Coords {
        int x;
        int y;
        public boolean equals(Object o) {
            Coords c = (Coords)o;
            return c.x==x && c.y==y;
        }
        public Coords(int x, int y) {
            super();
            this.x = x;
            this.y = y;
        }
        public int hashCode() {
            return new Integer(x+"0"+y);
        }
    }

(not very good, I know, please don't tease me.) How can I now create a String where the characters are displayed in this map, for example:

Map<Coords, Character> map = new HashMap<Coords, Character>();
map.put(new Coords(0,0),'H');
map.put(new Coords(1,0),'e');
map.put(new Coords(2,0),'l');
map.put(new Coords(3,0),'l');
map.put(new Coords(4,0),'o');
map.put(new Coords(6,0),'!');
map put(new Coords(6,1),'!');
somehowTransformToString(map); //Hello !
                               //      !

Thanks,
Isaac Waller
(note - this is not homework)

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2 answers


  • Create a comparator that can sort Coords by y and then x:

    int d = c1.y - c2.y;
if (d == 0) d = c1.x - c2.y;
return d;

  • Create a sorted map:

    TreeMap<Coords, Character> sortedMap = new TreeMap(comparator);
sortedMap.putAll(map); // copy values from other map

  • Print out the card values ​​in the following order:

    for (Character c: map.values()) System.out.print(c);

  • If you want newlines:

    int y = -1;
for (Map.Entry<Coords, Character> e: map.entrySet()) {
    if (e.y != y) {
        if (y != -1) System.out.println();
        y = e.y;
    }
    System.out.print(c);
}


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I suggest you add a toString method for coordination, or use the Point class.

Map<Point, Character> map = new HashMap<Point , Character>();
map.put(new Point(0,0),'H');
map.put(new Point(1,0),'e');
map.put(new Point(2,0),'l');
map.put(new Point(3,0),'l');
map.put(new Point(4,0),'o');
map.put(new Point(6,0),'!');
map put(new Point(6,1),'!');
String text = map.toString();


If you want to expand characters, you can use a multidimensional array.

char[][] grid = new char[7][2];
grid[0][0] ='H';
grid[0][1] ='e';
grid[0][2] ='l';
grid[0][3] ='l';
grid[0][4] ='o';
grid[0][6] ='!';
grid[1][6] ='!';
for(char[] line: grid) System.out.println(new String(line));
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