Java打砖块游戏 - 在框架中打印砖块的问题

下面是一个Java打砖块游戏的简单示例，其中包含了在框架中打印砖块的解决方法。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class BrickBreaker extends JFrame {
    private static final int FRAME_WIDTH = 800;
    private static final int FRAME_HEIGHT = 600;
    private static final int BRICK_WIDTH = 50;
    private static final int BRICK_HEIGHT = 20;
    private static final int PADDLE_WIDTH = 100;
    private static final int PADDLE_HEIGHT = 10;
    private static final int BALL_SIZE = 20;

    private int paddleX;
    private int ballX;
    private int ballY;
    private int ballXSpeed;
    private int ballYSpeed;

    public BrickBreaker() {
        setTitle("Brick Breaker");
        setSize(FRAME_WIDTH, FRAME_HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);

        paddleX = FRAME_WIDTH / 2 - PADDLE_WIDTH / 2;
        ballX = FRAME_WIDTH / 2 - BALL_SIZE / 2;
        ballY = FRAME_HEIGHT / 2 - BALL_SIZE / 2;
        ballXSpeed = 3;
        ballYSpeed = 3;

        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                if (e.getKeyCode() == KeyEvent.VK_LEFT) {
                    paddleX -= 10;
                } else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
                    paddleX += 10;
                }
                repaint();
            }
        });
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        drawBricks(g);
        drawPaddle(g);
        drawBall(g);
    }

    private void drawBricks(Graphics g) {
        int brickRows = 4;
        int brickCols = FRAME_WIDTH / BRICK_WIDTH;

        for (int row = 0; row < brickRows; row++) {
            for (int col = 0; col < brickCols; col++) {
                int brickX = col * BRICK_WIDTH;
                int brickY = row * BRICK_HEIGHT;
                g.fillRect(brickX, brickY, BRICK_WIDTH, BRICK_HEIGHT);
            }
        }
    }

    private void drawPaddle(Graphics g) {
        g.fillRect(paddleX, FRAME_HEIGHT - PADDLE_HEIGHT, PADDLE_WIDTH, PADDLE_HEIGHT);
    }

    private void drawBall(Graphics g) {
        g.fillOval(ballX, ballY, BALL_SIZE, BALL_SIZE);
        ballX += ballXSpeed;
        ballY += ballYSpeed;

        if (ballX < 0 || ballX > FRAME_WIDTH - BALL_SIZE) {
            ballXSpeed *= -1;
        }
        if (ballY < 0 || ballY > FRAME_HEIGHT - BALL_SIZE) {
            ballYSpeed *= -1;
        }

        if (ballY > FRAME_HEIGHT - BALL_SIZE - PADDLE_HEIGHT && ballX >= paddleX && ballX <= paddleX + PADDLE_WIDTH) {
            ballYSpeed *= -1;
        }

        if (ballY > FRAME_HEIGHT - BALL_SIZE) {
            // 游戏结束
            ballX = FRAME_WIDTH / 2 - BALL_SIZE / 2;
            ballY = FRAME_HEIGHT / 2 - BALL_SIZE / 2;
        }

        repaint();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new BrickBreaker();
            }
        });
    }
}

以上代码实现了一个简单的打砖块游戏，使用了Java的Swing框架来创建游戏窗口和绘制图形。在paint方法中调用drawBricks、drawPaddle和drawBall方法来绘制砖块、挡板和球。在drawBricks方法中使用嵌套循环来绘制多行多列的砖块。在drawPaddle方法中使用fillRect方法绘制挡板，其位置由paddleX变量控制。在drawBall方法中使用fillOval方法绘制球，其位置由ballX和ballY变量控制，同时根据速度ballXSpeed和ballYSpeed来更新球的位置