Refactor: Apply Iterator pattern to SudokuBoard

Author: KaranMishra3610

src/main/java/com/thealgorithms/puzzlesandgames/SudokuBoard.java

@@ -0,0 +1,85 @@
+package sudoku;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+/**
+ * Represents a Sudoku board with support for iteration using the Iterator pattern.
+ */
+public class SudokuBoard implements Iterable<SudokuBoard.Cell> {
+
+    private final int[][] board;
+    private final int size;
+
+    public SudokuBoard(int size) {
+        this.size = size;
+        this.board = new int[size][size];
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public int getValue(int row, int col) {
+        return board[row][col];
+    }
+
+    public void setValue(int row, int col, int value) {
+        board[row][col] = value;
+    }
+
+    /** Represents a single cell in the Sudoku board */
+    public static class Cell {
+        private final int row;
+        private final int col;
+        private final int value;
+
+        public Cell(int row, int col, int value) {
+            this.row = row;
+            this.col = col;
+            this.value = value;
+        }
+
+        public int getRow() {
+            return row;
+        }
+
+        public int getCol() {
+            return col;
+        }
+
+        public int getValue() {
+            return value;
+        }
+    }
+
+    /** Iterator implementation for Sudoku board cells */
+    private class CellIterator implements Iterator<Cell> {
+        private int row = 0;
+        private int col = 0;
+
+        @Override
+        public boolean hasNext() {
+            return row < size && col < size;
+        }
+
+        @Override
+        public Cell next() {
+            if (!hasNext()) {
+                throw new NoSuchElementException();
+            }
+            Cell cell = new Cell(row, col, board[row][col]);
+            col++;
+            if (col == size) {
+                col = 0;
+                row++;
+            }
+            return cell;
+        }
+    }
+
+    @Override
+    public Iterator<Cell> iterator() {
+        return new CellIterator();
+    }
+}