american-identity-project/American-Identity-Project/Display.java

import javax.swing.*;

public class Display {
  public static void main(String[] args) {
    int boardWidth = 800;
    int boardHeight = 600;
    int tileSize = 20;

    JFrame game = new JFrame();
    game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    game.setSize(boardWidth, boardHeight);
    game.setVisible(true);
    game.setLocationRelativeTo(null);
    game.setResizable(false);

    Platformer platformer = new Platformer(boardWidth, boardHeight, tileSize);
    game.add(platformer);
    game.pack();
    platformer.requestFocus();
  }
}