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《Java游戏开发入门教程》：一份简单的Java游戏代码大全
2023-06-15 15:17:08 深夜i     --     --
Java游戏开发 贪吃蛇游戏 程序代码

《Java游戏开发入门教程》：一份简单的Java游戏代码大全

Java语言的高性能和可靠性为游戏开发提供了一个稳定的平台。无论是开发基于控制台的文字游戏，还是基于Java图形用户界面（GUI）的三维游戏，Java的资源库和插件库都为游戏开发人员提供了广泛的资源。

在这份入门教程中，我们将介绍Java游戏开发的基础知识，并提供一些简单的游戏代码示例。以下是一个基于Java的贪吃蛇游戏，以及它的完整代码：

import javax.swing.*;
import java.awt.*;
public class SnakeGame extends JFrame {
  public SnakeGame() {
    setTitle("贪吃蛇游戏");
    setSize(320, 340);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
    setResizable(false);
    SnakeBoard board = new SnakeBoard();
    add(board);
  }
  public static void main(String[] args) {
    EventQueue.invokeLater(() -> {
      JFrame ex = new SnakeGame();
      ex.setVisible(true);
    });
  }
}
class SnakeBoard extends JPanel {
  private final int BOARD_WIDTH = 300;
  private final int BOARD_HEIGHT = 300;
  private final int OFF_SET = 10;
  private final int DOT_SIZE = 10;
  private final int ALL_DOTS = 900;
  private final int RANDOM_POS = 29;
  private final int[] x = new int[ALL_DOTS];
  private final int[] y = new int[ALL_DOTS];
  private int dots;
  private int apple_x;
  private int apple_y;
  private boolean leftDirection = false;
  private boolean rightDirection = true;
  private boolean upDirection = false;
  private boolean downDirection = false;
  private boolean inGame = true;
  private Timer timer;
  private Image dot;
  private Image apple;
  private Image head;
  public SnakeBoard() {
    addKeyListener(new KeyAdapter());
    setBackground(Color.black);
    setFocusable(true);
    setPreferredSize(new Dimension(BOARD_WIDTH, BOARD_HEIGHT));
    loadImages();
    initGame();
  }
  private void loadImages() {
    ImageIcon iid = new ImageIcon("src/resources/dot.png");
    dot = iid.getImage();
    ImageIcon iia = new ImageIcon("src/resources/apple.png");
    apple = iia.getImage();
    ImageIcon iih = new ImageIcon("src/resources/head.png");
    head = iih.getImage();
  }
  private void initGame() {
    dots = 3;
    for (int z = 0; z < dots; z++) {
      x[z] = 50 - z * 10;
      y[z] = 50;
    }
    locateApple();
    timer = new Timer(140, e -> {
      if (inGame) {
        checkApple();
        checkCollision();
        move();
      }
      repaint();
    });
    timer.start();
  }
  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    doDrawing(g);
  }
  private void doDrawing(Graphics g) {
    if (inGame) {
      g.drawImage(apple, apple_x, apple_y, this);
      for (int z = 0; z < dots; z++) {
        if (z == 0) {
          g.drawImage(head, x[z], y[z], this);
        } else {
          g.drawImage(dot, x[z], y[z], this);
        }
      }
    } else {
      gameOver(g);
    }
  }
  private void gameOver(Graphics g) {
    String msg = "Game Over";
    Font small = new Font("Helvetica", Font.BOLD, 14);
    FontMetrics metr = getFontMetrics(small);
    g.setColor(Color.white);
    g.setFont(small);
    g.drawString(msg, (BOARD_WIDTH - metr.stringWidth(msg)) / 2, BOARD_HEIGHT / 2);
  }
  private void checkApple() {
    if ((x[0] == apple_x) && (y[0] == apple_y)) {
      dots++;
      locateApple();
    }
  }
  private void move() {
    for (int z = dots; z > 0; z--) {
      x[z] = x[(z - 1)];
      y[z] = y[(z - 1)];
    }
    if (leftDirection) {
      x[0] -= DOT_SIZE;
    }
    if (rightDirection) {
      x[0] += DOT_SIZE;
    }
    if (upDirection) {
      y[0] -= DOT_SIZE;
    }
    if (downDirection) {
      y[0] += DOT_SIZE;
    }
  }
  private void checkCollision() {
    for (int z = dots; z > 0; z--) {
      if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z]))
        inGame = false;
      
    }
    if (y[0] >= BOARD_HEIGHT)
      inGame = false;
    
    if (y[0] < 0)
      inGame = false;
    
    if (x[0] >= BOARD_WIDTH)
      inGame = false;
    
    if (x[0] < 0)
      inGame = false;
    
    if (!inGame) {
      timer.stop();
    }
  }
  private void locateApple() {
    int r = (int) (Math.random() * RANDOM_POS);
    apple_x = ((r * DOT_SIZE));
    r = (int) (Math.random() * RANDOM_POS);
    apple_y = ((r * DOT_SIZE));
  }
  public class KeyAdapter extends java.awt.event.KeyAdapter {
    @Override
    public void keyPressed(java.awt.event.KeyEvent e) {
      int key = e.getKeyCode();
      if ((key == java.awt.event.KeyEvent.VK_LEFT) && (!rightDirection))
        leftDirection = true;
        upDirection = false;
        downDirection = false;
      
      if ((key == java.awt.event.KeyEvent.VK_RIGHT) && (!leftDirection))
        rightDirection = true;
        upDirection = false;
        downDirection = false;
      
      if ((key == java.awt.event.KeyEvent.VK_UP) && (!downDirection))
        upDirection = true;
        rightDirection = false;
        leftDirection = false;
      
      if ((key == java.awt.event.KeyEvent.VK_DOWN) && (!upDirection))
        downDirection = true;
        rightDirection = false;
        leftDirection = false;
      
    }
  }
}

这是一个简单的贪吃蛇游戏，用Java语言编写。游戏界面是一个300像素乘以300像素的面板，里面包含了一些小圆点组成的蛇，还有一个红色的苹果。

玩家可以通过按下键盘上的箭头键来控制蛇的移动方向，吃掉苹果可以增加蛇的长度。如果蛇的头部与它的身体相撞，或者蛇撞到了屏幕边缘，游戏就会结束。

这个小游戏代码虽短，但是包含了许多Java游戏开发的基础知识，比如使用图像、坐标计算、游戏逻辑等等。开发者可以在此基础上进行扩展和优化，创作出更加有趣的游戏作品。

代码示例、文档、插件库和其他资源，可以在GitHub等开源社区中找到。

  
  

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