reorganized code

Board.java

@@ -0,0 +1,23 @@
+import java.awt.*;
+
+public class Board {
+  Piece[][] board;
+
+  public Board() {
+    board = new Piece[8][8];
+    for (int i = 0; i <= 7; i++) {
+      board[i][2] = new Pawn(i + 1, 2, "Black");
+    }
+    for (int i = 0; i <= 7; i++) {
+      board[i][7] = new Pawn(i + 1, 7, "Black");
+    }
+  }
+
+  public void draw(Graphics g) {
+    for (Piece[] row : board) {
+      for (Piece p : row) {
+        if (p != null) p.draw(g);
+      }
+    }
+  }
+}