java贪吃蛇简单版

游戏思路

步骤1：实现静态的蛇

蛇的类（初始化部分）：
地图类：

重写的绘制方法：

步骤2：通过键盘让蛇移动起来

蛇的移动方法：

键盘监听事件：

步骤3：通过定时器让蛇移动起来

创建并使用定时器：

步骤4：添加生成点的方法

节点的类

食物继承节点，并重写构造方法。

步骤5：吃东西的方法

在移动的基础上将删除的尾节点复原

步骤6：死亡

两种死亡条件

代码汇总

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;
    //当前方向
    int dir=-1;
    //下一次移动的方向
    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;
        }
        //增加头结点
        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;
        //删除尾节点
        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("贪吃蛇");
        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,"你碰到了自己的身体","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,"你碰到了墙","死亡",JOptionPane.WARNING_MESSAGE);
                System.exit(0);
                timer.stop();
            }
            node = node.nextNode;
        }
    }
}

本次收获和感受

果然学习还是要多敲代码，很多知识是你觉的你会了。但是电脑不要你觉的。还有就是编写代码的时候要细心，不然有时候de了一个小时的bug最后发现是一个单词拼错了会崩溃的哟！