java貪吃蛇簡單版

游戲思路

步驟1：實作靜態的蛇

蛇的類（初始化部分）：
地圖類：

重寫的繪制方法：

步驟2：通過鍵盤讓蛇移動起來

蛇的移動方法：

鍵盤監聽事件：

步驟3：通過定時器讓蛇移動起來

創建并使用定時器：

步驟4：添加生成點的方法

節點的類

食物繼承節點，并重寫構造方法，

步驟5：吃東西的方法

在移動的基礎上將洗掉的尾節點復原

步驟6：死亡

兩種死亡條件

代碼匯總

package com.company;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

public class Main {

    public static void main(String[] args) {
        new Map().addGame(new Game());
    }
}
class Node {
    int x;
    int y;
    Node nextNode;
    public Node(){}
    public Node(int x,int y){
        this.x = x;
        this.y = y;
    }
}
class Food extends Node {
    public Food(){
        x = new Random().nextInt(39);
        y = new Random().nextInt(38);
    }
}

class Snake {
    Node head;
    Node tail;
    Node hid = null;
    //當前方向
    int dir=-1;
    //下一次移動的方向
    int nextDir=-1;
    public Snake(){
        //初始化蛇身
        this.head = new Node(5,6);
        this.head.nextNode = new Node(5,7);
        this.head.nextNode.nextNode = new Node(5,8);
        this.tail = this.head.nextNode.nextNode;
        this.tail.nextNode = this.hid;
    }
    public void eatFood(){
        tail = hid;
        hid = null;
    }
    public void move() {
        //1:左  -1:右 2:上 3：下
        if (nextDir != -dir) {
            dir = nextDir;
        }
        else if (nextDir==dir) {
            return;
        }
        //增加頭結點
        Node node = null;
        switch (dir) {
            case 1:  node = new Node(head.x-1, head.y);break;
            case -1: node = new Node(head.x+1, head.y);break;
            case 2:  node = new Node(head.x, head.y-1);break;
            case -2: node = new Node(head.x, head.y+1);break;
        }
        node.nextNode = head;
        head = node;
        //洗掉尾節點
        node = head;
        while(node!=null) {
            if (node.nextNode == tail) {
                tail = node;
                hid = tail.nextNode;
                break;
            }
            node = node.nextNode;
        }
    }
}

class Map extends JFrame {
    JFrame jFrame;
    public Map(){
        jFrame = new JFrame("貪吃蛇");
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jFrame.setVisible(true);
        jFrame.setBounds(200,200,600,615);
        jFrame.setResizable(false);
    }
    public void addGame(Game game) {
        jFrame.add(game);
        game.requestFocus();
    }
}

class Game extends JPanel {
    Snake snake = new Snake();
    Food food = new Food();
    int unit = 15;
    Timer timer;
    {
        ActionListener actionListener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                snake.move();
                checkCollide();
                repaint();
            }
        };
        timer = new Timer(100,actionListener);
        timer.start();
        KeyListener keyListener = new KeyListener(){
            @Override
            public void keyTyped(KeyEvent e) {
            }
            @Override
            public void keyPressed(KeyEvent e) {
                switch (e.getKeyCode()) {
                    case KeyEvent.VK_UP:
                        snake.nextDir = 2;
                        break;
                    case KeyEvent.VK_DOWN:
                        snake.nextDir = -2;
                        break;
                    case KeyEvent.VK_LEFT:
                        snake.nextDir = 1;
                        break;
                    case KeyEvent.VK_RIGHT:
                        snake.nextDir = -1;
                        break;
                }
            }
            @Override
            public void keyReleased(KeyEvent e) {

            }
        };
        this.addKeyListener(keyListener);
    }
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Node node = snake.head;
        while (node!=snake.tail.nextNode) {
            g.setColor(Color.green);
            g.fillRoundRect(food.x*unit,food.y*unit,unit,unit,unit,unit);
            g.setColor(Color.red);
            g.fillRect(node.x*unit,node.y*unit,unit,unit);
            node = node.nextNode;
        }
    }
    public void checkCollide(){
        if (snake.head.x==food.x&&snake.head.y==food.y) {
            snake.eatFood();
            food = new Food();
        }
        Node node = snake.head.nextNode;
        while(node!=snake.tail.nextNode) {
            if (snake.head.x==node.x&&snake.head.y==node.y) {
                JOptionPane.showMessageDialog(this,"你碰到了自己的身體","死亡",JOptionPane.WARNING_MESSAGE);
                System.exit(0);
                timer.stop();
            }
            else if (snake.head.x==-1||snake.head.x==39||snake.head.y==-1||snake.head.y==39) {
                JOptionPane.showMessageDialog(this,"你碰到了墻","死亡",JOptionPane.WARNING_MESSAGE);
                System.exit(0);
                timer.stop();
            }
            node = node.nextNode;
        }
    }
}

本次識訓和感受

果然學習還是要多敲代碼，很多知識是你覺的你會了，但是電腦不要你覺的，還有就是撰寫代碼的時候要細心，不然有時候de了一個小時的bug最后發現是一個單詞拼錯了會崩潰的喲！