Added Grid.java, Patch.java

Grid.java

@@ -0,0 +1,29 @@
+public class Grid {
+
+    private Patch[][] _grid;
+
+    public Grid() {
+        _grid = new Patch[1][1];
+        _grid[0][0] = new Patch(this, 0, 0);
+    }
+
+    public Grid(int x, int y) {
+        _grid = new Patch[x][y];
+        for(int i = 0; i < x; i++) {
+            for(int j = 0; j < y; j++) {
+                _grid[i][j] = new Patch(this, i, j);
+            }
+        }
+    }
+
+    public String toString() }
+        String ans = "";
+        for(int i = 0; i < _grid.length; i++) {
+            for(int j = 0; j < _grid[i].length; j++) {
+                ans += _grid[i][j];
+            }
+            ans += "\n";
+        }
+        return ans;
+    }
+}

Patch.java

@@ -0,0 +1,15 @@
+public class Patch {
+    private int _pxcor, _pycor;
+    private String _plabel;
+    private Grid _myGrid;
+
+    public Patch(Grid grid, int xcor, int ycor) {
+        _myGrid = grid;
+        _pxcor = xcor;
+        _pycor = ycor;
+    }
+
+    public String toString() {
+        return _plabel;
+    }
+}