关于贪食蛇的源代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import static javax.swing.JOptionPane.YES_OPTION;
import static javax.swing.JOptionPane.showMessageDialog;


class myBigFrame extends JFrame implements MouseListener, KeyListener {
   private final int X = 0, Y = 1;
   boolean canPlay = false;
   private boolean ifAlive = true;
   private ArrayList<int[]> mySnake = new ArrayList<>(4);
   private ArrayList<int[]> myFood = new ArrayList<>(3);
   private int score = 0;

   //构造方法包含：对snakeArrayList初始化、对foodArrayList的初始化、对画面的不断刷新、对是否吃到food的判断和响应;
   myBigFrame() {
      myBigPanel myPanel = new myBigPanel();
      Timer timerRepaint = new Timer(true);
      Timer timerRun = new Timer(true);
      Timer timerEat = new Timer(true);
      this.add(myPanel);
      //对数组连进行初始化;初始的四位数组链;
      for (int i = 0; i < 4; i++) mySnake.add(new int[]{0, 0});
      for (int i = 0; i < 3; i++) myFood.add(new int[]{0, 0});
      //对列表初始化。
      for (int i = 0; i < 4; i++) {
         mySnake.set(i, new int[]{0, 3 - i});
      }
      for (int i = 0; i < 3; i++) {
         myFood.set(i, new int[]{(int) (Math.random() * 27), (int) (Math.random() * 18)});
      }

      setSize(1130, 810);
      setLocationRelativeTo(null);
      setResizable(false);
      setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      setTitle("贪食蛇游戏！");
      setVisible(true);
      addMouseListener(this);
      addKeyListener(this);
      timerRun.schedule(
            new TimerTask() {
               public void run() {
                  //分别判断两个四个方向设置一个按照当前方向不断运动的机制;
                  if (mySnake.get(0)[X] - mySnake.get(1)[X] == 1 && canPlay && ifAlive) {
                     //向右走
                     for (int i = mySnake.size() - 1; i > 0; i--) mySnake.set(i, mySnake.get(i - 1));
                     if (mySnake.get(0)[X] < 26)
                        mySnake.set(0, new int[]{mySnake.get(0)[X] + 1, mySnake.get(0)[Y]});
                     else ifAlive = false;
                  } else if (mySnake.get(0)[X] - mySnake.get(1)[X] == -1 && canPlay && ifAlive) {
                     //向左走
                     for (int i = mySnake.size() - 1; i > 0; i--) mySnake.set(i, mySnake.get(i - 1));
                     if (mySnake.get(0)[X] > 0)
                        mySnake.set(0, new int[]{mySnake.get(0)[X] - 1, mySnake.get(0)[Y]});
                     else ifAlive = false;
                  } else if (mySnake.get(0)[Y] - mySnake.get(1)[Y] == 1 && canPlay && ifAlive) {
                     //向下走
                     for (int i = mySnake.size() - 1; i > 0; i--) mySnake.set(i, mySnake.get(i - 1));
                     if (mySnake.get(0)[Y] < 17)
                        mySnake.set(0, new int[]{mySnake.get(0)[X], mySnake.get(0)[Y] + 1});
                     else ifAlive = false;
                  } else if (mySnake.get(0)[Y] - mySnake.get(1)[Y] == -1 && canPlay && ifAlive) {
                     //向上走
                     for (int i = mySnake.size() - 1; i > 0; i--) mySnake.set(i, mySnake.get(i - 1));
                     if (mySnake.get(0)[Y] > 0)
                        mySnake.set(0, new int[]{mySnake.get(0)[X], mySnake.get(0)[Y] - 1});
                     else ifAlive = false;
                  }
               }
            }, 0, 100);
      timerRepaint.schedule(
            new TimerTask() {
               @Override
               public void run() {
                  //由JFrame继承而来的刷新方法。
                  if (canPlay && ifAlive) myBigFrame.super.repaint();
                  if (!ifAlive && canPlay) {
                     JOptionPane.showMessageDialog(myPanel, "游戏结束！");
                     if (JOptionPane.showConfirmDialog(myPanel, "是否重新开始？") == YES_OPTION) {
                        showMessageDialog(myPanel, "开始啦！");
                        mySnake = new ArrayList<>(4);
                        myFood = new ArrayList<>(3);
                        for (int i = 0; i < 4; i++) mySnake.add(new int[]{0, 0});
                        for (int i = 0; i < 3; i++) myFood.add(new int[]{0, 0});
                        for (int i = 0; i < 4; i++) {
                           mySnake.set(i, new int[]{0, 3 - i});
                        }
                        for (int i = 0; i < 3; i++) {
                           myFood.set(i, new int[]{(int) (Math.random() * 27), (int) (Math.random() * 18)});
                        }
                        myBigFrame.this.canPlay = true;
                        myBigFrame.this.ifAlive = true;
                     } else {
                        JOptionPane.showMessageDialog(myPanel, "关闭！");
                        myBigFrame.this.canPlay = false;
                        myBigFrame.this.setVisible(false);
                     }
                  }
               }
            }, 0, 10);
      timerEat.schedule(
            new TimerTask() {
               @Override
               public void run() {
                  if (ifEatAndChangeFood()) mySnake.add(mySnake.get(mySnake.size() - 1));
               }
            }, 0, 5);
   }

   private boolean ifEatAndChangeFood() {
      for (int i = 0; i < 3; i++)
         if (mySnake.get(0)[X] == myFood.get(i)[X] && mySnake.get(0)[Y] == myFood.get(i)[Y]) {
            myFood.set(i, new int[]{(int) (Math.random() * 27), (int) (Math.random() * 18)});
            return true;
         }
      return false;
   }


   //方向键按下事件;
   public void keyPressed(KeyEvent e) {
      boolean ifGetDirectionKeyIn = e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_DOWN ||
            e.getKeyCode() == KeyEvent.VK_LEFT || e.getKeyCode() == KeyEvent.VK_RIGHT;

      if (ifGetDirectionKeyIn && canPlay)
         for (int i = mySnake.size() - 1; i > 0; i--) mySnake.set(i, mySnake.get(i - 1));

      if (e.getKeyCode() == KeyEvent.VK_UP && canPlay)
         mySnake.set(0, new int[]{mySnake.get(0)[X], mySnake.get(0)[Y] - 1});

      else if (e.getKeyCode() == KeyEvent.VK_DOWN && canPlay)
         mySnake.set(0, new int[]{mySnake.get(0)[X], mySnake.get(0)[Y] + 1});

      else if (e.getKeyCode() == KeyEvent.VK_LEFT && canPlay)
         mySnake.set(0, new int[]{mySnake.get(0)[X] - 1, mySnake.get(0)[Y]});

      else if (e.getKeyCode() == KeyEvent.VK_RIGHT && canPlay)
         mySnake.set(0, new int[]{mySnake.get(0)[X] + 1, mySnake.get(0)[Y]});
      else System.out.print(e.getKeyChar() + "    ");


      score = mySnake.size() - 4;
   }


   public void keyReleased(KeyEvent e) {
   }

   public void keyTyped(KeyEvent e) {
   }

   public void mouseClicked(MouseEvent e) {
      canPlay = true;
   }

   public void mousePressed(MouseEvent e) {
   }

   public void mouseReleased(MouseEvent e) {
   }

   public void mouseEntered(MouseEvent e) {
   }

   public void mouseExited(MouseEvent e) {
      canPlay = false;
   }


   class myBigPanel extends JPanel {
      public void paintComponent(Graphics graphics) {
         //线框颜色
         graphics.setColor(new Color(0x000000));
         for (int i = 0; i < 28; i++) {
            graphics.drawLine(20 + i * 40, 20, 20 + i * 40, 740);
         }
         for (int j = 0; j < 19; j++) {
            graphics.drawLine(20, 20 + j * 40, 1100, 20 + j * 40);
         }
         for (int i = 0; i < mySnake.size(); i++) {
            int Xpoint = mySnake.get(i)[0];
            int Ypoint = mySnake.get(i)[1];
            if (i == 0) {
               //蛇头颜色
               graphics.setColor(new Color(0x0032F2));
               graphics.fillRect(22 + Xpoint * 40, 22 + Ypoint * 40, 36, 36);
            } else {
               //蛇身颜色
               graphics.setColor(new Color(0x60BDFF));
               graphics.fillRect(22 + Xpoint * 40, 22 + Ypoint * 40, 36, 36);
            }
         }
         for (int[] ints : myFood) {
            int X_point = ints[0];
            int Y_point = ints[1];
            //食物颜色
            graphics.setColor(new Color(0xFFFC52));
            graphics.fillOval(22 + X_point * 40, 22 + Y_point * 40, 36, 36);
         }

         //字体颜色
         graphics.setColor(new Color(0xFD1100));
         graphics.setFont(new Font("微软雅黑", Font.BOLD, 24));
         graphics.drawString("你的得分是:" + String.valueOf(score), 400, 770);
      }
   }
}

//主函数
public class eatingSnake {
   public static void main(String args[]) {
      myBigFrame myBigFrame = new myBigFrame();
      myBigFrame.setVisible(true);
      if (JOptionPane.showConfirmDialog(myBigFrame, "是否现在开始呢？") == YES_OPTION) {
         showMessageDialog(myBigFrame, "开始啦！");
         myBigFrame.canPlay = true;

      } else {
         showMessageDialog(myBigFrame, "关闭！");
         myBigFrame.setVisible(false);
      }
   }
}