idk

Board.java

@@ -41,6 +41,14 @@ public class Board {
     return this.board[x][y];
   }
 
+  public void setPiece(int x, int y, Piece p) {
+    this.board[x][y] = p;
+  }
+
+  public void setPiece(Position pos, Piece p) {
+    this.board[pos.x][pos.y] = p;
+  }
+
   public static Board copy(Board b) {
     Board newBoard = new Board();
 

King.java

@@ -35,17 +35,28 @@ public class King extends Piece {
   }
 
   public ArrayList<Position> getLegalMoves(Board board) {
-    return null;
+    ArrayList<Position> positions = getPseudoLegalMoves(board);
+    for (Position p : new ArrayList<>(positions)) {
+      Piece tempPiece = board.getPiece(p);
+      board.setPiece(pos, tempPiece);
+      board.setPiece(p, this);
+      if (inCheck(board, p)) {
+        positions.remove(p);
+      }
+      board.setPiece(p, tempPiece);
+      board.setPiece(pos, this);
+    }
+    return positions;
   }
 
-  public boolean inCheck(Board board) {
+  public boolean inCheck(Board board, Position pos) {
     for (Piece[] pieces : board.board) {
       for (Piece p : pieces) {
         if (p == null) continue;
         if (!p.colorMatches(this) && !(p instanceof King)) {
           ArrayList<Position> ar = p.getLegalMoves(board);
           for (Position posi : ar) {
-            if (this.pos.equals(posi)) return true;
+            if (pos.equals(posi)) return true;
           }
         }
       }