我似乎无法打开窗户，有人能帮我理解为什么会这样吗？
这是我目前的代码：
在“new GameGrame()”上，它还说“新实例被忽略”，我不明白为什么，因为我不会一遍又一遍地回忆一个变量（如果我创建了一个GameFrame）。我只想为它创建一个新对象，以便显示窗口。
package snake;
public class Snake{
public static void main(String[] args){
new GameFrame();
}
}
和：
package snake;
import javax.swing.JFrame;
public class GameFrame extends JFrame{
GameFrame(){
this.add(new GamePanel());
this.setTitle("Snake");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
this.pack();
this.setVisible(true);
this.setLocationRelativeTo(null);
}
}
和：
package snake;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class GamePanel extends JFrame implements ActionListener {
static final int SCREEN_WIDTH = 600;
static final int SCREEN_HEIGHT = 600;
static final int UNIT_SIZE = 25;
static final int GAME_UNITS = (SCREEN_WIDTH*SCREEN_HEIGHT)/UNIT_SIZE;
static final int DELAY = 75;
final int x[] = new int[GAME_UNITS]; //GAME_UNITS = size since snake won't be bigger than game space
final int y[] = new int[GAME_UNITS];
int bodyParts = 6;
int applesEaten = 0;
int appleX;
int appleY;
//direction
char direction = 'R'; //start toward right
boolean running = false;
Timer timer;
Random random;
GamePanel(){
random = new Random();
this.setPreferredSize(new Dimension(SCREEN_WIDTH, SCREEN_HEIGHT));
this.setBackground(Color.BLACK);
this.setFocusable(true);
this.addKeyListener(new MyKeyAdapter());
startGame();
}
public void startGame(){
newApple();
running = true;
timer = new Timer(DELAY, this);
timer.start();
}
public void paintComponent(Graphics g){
super.paintComponents(g);
draw(g);
}
public void draw(Graphics g){
for (int i=0; i < SCREEN_HEIGHT/UNIT_SIZE; i++){
g.drawLine(i*UNIT_SIZE, 0, i*UNIT_SIZE, SCREEN_HEIGHT);
}
}
和：
public class MyKeyAdapter extends KeyAdapter{
@Override
public void keyPressed(KeyEvent e){
}
}