GameBoard class

package com.packag;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;

public class GameBoard {
    public static final int ROWS = 4;
    public static final int COLS = 4;

    private final int startingTiles = 2;
    private Tile[][] board;
    private boolean dead;
    private boolean won;
    private BufferedImage gameBoard;
    private BufferedImage finalBoard;
    private int x;
    private int y;

    private static int SPACING = 10;
    public static int BOARD_WIDTH = (COLS +1) * SPACING + COLS * Tile.WIDTH;
    public static int BOARD_HEIGHT = (ROWS +1) * SPACING + ROWS* Tile.HEIGHT;

    private boolean hasStarted;

    public GameBoard(int x, int y){
        this.x = x;
        this.y = y;
        board = new Tile[ROWS][COLS];
        gameBoard = new BufferedImage(BOARD_WIDTH, BOARD_HEIGHT, BufferedImage.TYPE_INT_RGB);
        finalBoard = new BufferedImage(BOARD_WIDTH, BOARD_HEIGHT, BufferedImage.TYPE_INT_RGB);

        creatBoardImage();
    }
    private void creatBoardImage(){
        Graphics2D g = (Graphics2D) gameBoard.getGraphics();
        g.setColor(Color.darkGray);
        g.fillRect(0,0, BOARD_WIDTH, BOARD_HEIGHT);
        g.setColor(Color.lightGray);

        for(int row = 0; row < ROWS; row++){
            for (int col = 0; col < COLS; col++){
                int x = SPACING + SPACING * col + Tile.WIDTH * col;
                int y = SPACING + SPACING * row + Tile.HEIGHT * row;
                g.fillRoundRect(x, y, Tile.WIDTH, Tile.HEIGHT, Tile.ARC_WIDTH, Tile.ARC_HEIGHT);
            }
        }
    }

    public void render ( Graphics2D g){
        Graphics2D g2d = (Graphics2D)finalBoard.getGraphics();
        g2d.drawImage(gameBoard, 0, 0, null);

        //draw tiles

        g.drawImage(finalBoard, x, y, null);
        g2d.dispose();
    }

    public void  update(){
        checkKeys();
    }

    private void checkKeys(){
        if (Keyboard.typed(KeyEvent.VK_LEFT)){
            // move tiles left
            if (!hasStarted) hasStarted = true;
        }
        if (Keyboard.typed(KeyEvent.VK_RIGHT)){
            // move tiles right
            if (!hasStarted) hasStarted = true;
        }
        if (Keyboard.typed(KeyEvent.VK_UP)){
            // move tiles up
            if (!hasStarted) hasStarted = true;
        }
        if (Keyboard.typed(KeyEvent.VK_DOWN)){
            // move tiles down
            if (!hasStarted) hasStarted = true;
        }
    }
}