added comments to the loading/saving methods

src/backend/Board.java

@@ -222,11 +222,11 @@ public class Board {
 	/* saving-loading feature :*/
 
 	public String[] toFileRep() {
-        String[] out = new String[height + 1];
+        String[] out = new String[height + 1]; // Create an output array with one String per board‐row plus one for the turn line
-        for (int y = 0; y < height; y++) {
+        for (int y = 0; y < height; y++) { // // For each row y = 0 … height-1
-            StringBuilder row = new StringBuilder();
+            StringBuilder row = new StringBuilder(); // We’ll build this row’s CSV (Comma-Separated Values) line in a StringBuilder
-            for (int x = 0; x < width; x++) {
+            for (int x = 0; x < width; x++) { // // For each column x = 0 … width-1
-                Piece p = board[x][y];
+                Piece p = board[x][y]; //Grab whatever piece (or null) lives at board[x][y]
                 if (p == null) {
                     row.append("--");
                 } else {
@@ -240,29 +240,38 @@ public class Board {
                         case Pawn:   row.append('P'); break;
                     }
                 }
-                if (x < width - 1) row.append(',');
+                if (x < width - 1) row.append(','); // After each cell except the last in the row, add a comma
             }
-            out[y] = row.toString();
+            out[y] = row.toString(); // Convert our StringBuilder into a String and store it as line y
         }
         // whose turn next
         out[height] = isTurnWhite ? "W" : "B";
-        return out;
+        return out; //Give back the full array of text‐lines ready to be written to a file.
     }
 
 	public Board(String[] fileRep) {
-        // derive dimensions
+       
+		 // Figure out how wide the board is by splitting line 0 on commas:
+	    // fileRep[0] might be something like "WR,WN,WB,WQ,WK,WB,WN,WR"
+	    // splitting on “,” gives 8 pieces, so width = 8.
+		
         this.width  = fileRep[0].split(",").length;
-        this.height = fileRep.length - 1;
+        
-        this.board  = new Piece[width][height];
+     //The number of rows is the number of lines minus the final turn‐line:
+        // fileRep.length is 9 for an 8×8 board (8 rows + 1 turn line), so height = 8.
+        
+        this.height = fileRep.length - 1; 
+        
+        this.board  = new Piece[width][height]; // Allocate the 2D array to hold Piece references
 
         // parse each row
-        for (int y = 0; y < height; y++) {
+        for (int y = 0; y < height; y++) { //For each board row y = 0 … height-1:
-            String[] cells = fileRep[y].split(",");
+            String[] cells = fileRep[y].split(","); //Split that line on commas into exactly `width` cell codes
-            for (int x = 0; x < width; x++) {
+            for (int x = 0; x < width; x++) { //For each column x = 0 … width-1:
-                String c = cells[x];
+                String c = cells[x]; //Grab the two‐character code (or "--")
-                if (!c.equals("--")) {
+                if (!c.equals("--")) { //If it’s not “--”, we must build a Piece there
-                    boolean white = (c.charAt(0) == 'W');
+                    boolean white = (c.charAt(0) == 'W'); //Determine color: W→white=true, B→white=false
-                    char    t     = c.charAt(1);
+                    char    t     = c.charAt(1); //Look at the second character to pick the piece type
                     PieceType type;
                     switch (t) {
                         case 'K': type = PieceType.King;   break;
@@ -284,7 +293,7 @@ public class Board {
         this.isTurnWhite       = fileRep[height].equals("W");
         this.previousStates    = new ArrayList<>();
         this.highlightedSquares= new ArrayList<>();
-        // any other fields you need to init…
+        
     }