java贪吃蛇极速版

本文为大家推荐了一款由java实现经典小游戏：贪吃蛇，相信大家都玩过，如何实现的呐？

效果图：

废话不多说，直接奉上代码：

1、

public class greedsnake {
  public static void main(string[] args) {
    snakemodel model = new snakemodel(20,30);
    snakecontrol control = new snakecontrol(model);
    snakeview view = new snakeview(model,control);
    //添加一个观察者，让view成为model的观察者
    model.addobserver(view);
   
    (new thread(model)).start();
  }
}

2、

package mvctest;

//snakecontrol.java
import java.awt.event.keyevent;
import java.awt.event.keylistener;


public class snakecontrol implements keylistener{
  snakemodel model;

  public snakecontrol(snakemodel model){
    this.model = model;
  }

  public void keypressed(keyevent e) {
    int keycode = e.getkeycode();
    if (model.running){        // 运行状态下，处理的按键
      switch (keycode) {
        case keyevent.vk_up:
          model.changedirection(snakemodel.up);
          break;
        case keyevent.vk_down:
          model.changedirection(snakemodel.down);
          break;
        case keyevent.vk_left:
          model.changedirection(snakemodel.left);
          break;
        case keyevent.vk_right:
          model.changedirection(snakemodel.right);
          break;
        case keyevent.vk_add:
        case keyevent.vk_page_up:
          model.speedup();
          break;
        case keyevent.vk_subtract:
        case keyevent.vk_page_down:
          model.speeddown();
          break;
        case keyevent.vk_space:
        case keyevent.vk_p:
          model.changepausestate();
          break;
        default:
      }
    }

    // 任何情况下处理的按键，按键导致重新启动游戏
    if (keycode == keyevent.vk_r ||
        keycode == keyevent.vk_s ||
        keycode == keyevent.vk_enter) {
      model.reset();
    }
  }

  public void keyreleased(keyevent e) {
  }

  public void keytyped(keyevent e) {
  }
}

3、

package mvctest;


//snakemodel.java
import javax.swing.*;
import java.util.arrays;
import java.util.linkedlist;
import java.util.observable;
import java.util.random;


class snakemodel extends observable implements runnable {
  boolean[][] matrix;             // 指示位置上有没蛇体或食物
  linkedlist nodearray = new linkedlist();  // 蛇体
  node food;
  int maxx;
  int maxy;
  int direction = 2;             // 蛇运行的方向
  boolean running = false;          // 运行状态

  int timeinterval = 200;           // 时间间隔，毫秒
  double speedchangerate = 0.75;       // 每次得速度变化率
  boolean paused = false;           // 暂停标志

  int score = 0;               // 得分
  int countmove = 0;             // 吃到食物前移动的次数

  // up and down should be even
  // right and left should be odd
  public static final int up = 2;
  public static final int down = 4;
  public static final int left = 1;
  public static final int right = 3;

  public snakemodel( int maxx, int maxy) {
    this.maxx = maxx;
    this.maxy = maxy;

    reset();
  }

  public void reset(){
    direction = snakemodel.up;       // 蛇运行的方向
    timeinterval = 200;           // 时间间隔，毫秒
    paused = false;             // 暂停标志
    score = 0;               // 得分
    countmove = 0;             // 吃到食物前移动的次数

    // initial matirx, 全部清0
    matrix = new boolean[maxx][];
    for (int i = 0; i < maxx; ++i) {
      matrix[i] = new boolean[maxy];
      arrays.fill(matrix[i], false);
    }

    // initial the snake
    // 初始化蛇体，如果横向位置超过20个，长度为10，否则为横向位置的一半
    int initarraylength = maxx > 20 ? 10 : maxx / 2;
    nodearray.clear();
    for (int i = 0; i < initarraylength; ++i) {
      int x = maxx / 2 + i;//maxx被初始化为20
      int y = maxy / 2;  //maxy被初始化为30
      //nodearray[x,y]: [10,15]-[11,15]-[12，15]~~[20,15]
      //默认的运行方向向上，所以游戏一开始nodearray就变为：
      //    [10，14]-[10，15]-[11，15]-[12，15]~~[19，15]
      nodearray.addlast(new node(x, y));
      matrix[x][y] = true;
    }

    // 创建食物
    food = createfood();
    matrix[food.x][food.y] = true;
  }

  public void changedirection(int newdirection) {
    // 改变的方向不能与原来方向同向或反向
    if (direction % 2 != newdirection % 2) {
      direction = newdirection;
    }
  }

  
  public boolean moveon() {
    node n = (node) nodearray.getfirst();
    int x = n.x;
    int y = n.y;

    // 根据方向增减坐标值
    switch (direction) {
      case up:
        y--;
        break;
      case down:
        y++;
        break;
      case left:
        x--;
        break;
      case right:
        x++;
        break;
    }

    // 如果新坐标落在有效范围内，则进行处理
    if ((0 <= x && x < maxx) && (0 <= y && y < maxy)) {
    
      if (matrix[x][y]) {    // 如果新坐标的点上有东西（蛇体或者食物）
        if (x == food.x && y == food.y) {    // 吃到食物，成功
          nodearray.addfirst(food);      // 从蛇头赠长

          // 分数规则，与移动改变方向的次数和速度两个元素有关
          int scoreget = (10000 - 200 * countmove) / timeinterval;
          score += scoreget > 0 ? scoreget : 10;
          countmove = 0;

          food = createfood();        // 创建新的食物
          matrix[food.x][food.y] = true;   // 设置食物所在位置
          return true;
        } else                 // 吃到蛇体自身，失败
          return false;
        
      } else {         // 如果新坐标的点上没有东西（蛇体），移动蛇体
        nodearray.addfirst(new node(x, y));
        matrix[x][y] = true;
        n = (node) nodearray.removelast();
        matrix[n.x][n.y] = false;
        countmove++;
        return true;
      }
    }
    return false;                  // 触到边线，失败
  }

  public void run() {
    running = true;
    while (running) {
      try {
        thread.sleep(timeinterval);
      } catch (exception e) {
        break;
      }

      if (!paused) {
        if (moveon()) {
          setchanged();      // model通知view数据已经更新
          notifyobservers();
        } else {
          joptionpane.showmessagedialog(null,
              "you failed",
              "game over",
              joptionpane.information_message);
          break;
        }
      }
    }
    running = false;
  }

  private node createfood() {
    int x = 0;
    int y = 0;
    // 随机获取一个有效区域内的与蛇体和食物不重叠的位置
    do {
      random r = new random();
      x = r.nextint(maxx);
      y = r.nextint(maxy);
    } while (matrix[x][y]);

    return new node(x, y);
  }

  public void speedup() {
    timeinterval *= speedchangerate;
  }

  public void speeddown() {
    timeinterval /= speedchangerate;
  }

  public void changepausestate() {
    paused = !paused;
  }

  public string tostring() {
    string result = "";
    for (int i = 0; i < nodearray.size(); ++i) {
      node n = (node) nodearray.get(i);
      result += "[" + n.x + "," + n.y + "]";
    }
    return result;
  }
}

class node {
  int x;
  int y;

  node(int x, int y) {
    this.x = x;
    this.y = y;
  }
}

4、

package mvctest;

//snakeview.java
import javax.swing.*;
import java.awt.*;
import java.util.iterator;
import java.util.linkedlist;
import java.util.observable;
import java.util.observer;


public class snakeview implements observer {
  snakecontrol control = null;
  snakemodel model = null;

  jframe mainframe;
  canvas paintcanvas;
  jlabel labelscore;

  public static final int canvaswidth = 200;
  public static final int canvasheight = 300;

  public static final int nodewidth = 10;
  public static final int nodeheight = 10;

  public snakeview(snakemodel model, snakecontrol control) {
    this.model = model;
    this.control = control;

    mainframe = new jframe("greedsnake");

    container cp = mainframe.getcontentpane();

    // 创建顶部的分数显示
    labelscore = new jlabel("score:");
    cp.add(labelscore, borderlayout.north);

    // 创建中间的游戏显示区域
    paintcanvas = new canvas();
    paintcanvas.setsize(canvaswidth + 1, canvasheight + 1);
    paintcanvas.addkeylistener(control);
    cp.add(paintcanvas, borderlayout.center);

    // 创建底下的帮助栏
    jpanel panelbuttom = new jpanel();
    panelbuttom.setlayout(new borderlayout());
    jlabel labelhelp;
    labelhelp = new jlabel("pageup, pagedown for speed;", jlabel.center);
    panelbuttom.add(labelhelp, borderlayout.north);
    labelhelp = new jlabel("enter or r or s for start;", jlabel.center);
    panelbuttom.add(labelhelp, borderlayout.center);
    labelhelp = new jlabel("space or p for pause", jlabel.center);
    panelbuttom.add(labelhelp, borderlayout.south);
    cp.add(panelbuttom, borderlayout.south);

    mainframe.addkeylistener(control);
    mainframe.pack();
    mainframe.setresizable(false);
    mainframe.setdefaultcloseoperation(jframe.exit_on_close);
    mainframe.setvisible(true);
  }

  void repaint() {
    graphics g = paintcanvas.getgraphics();

    //draw background
    g.setcolor(color.white);
    g.fillrect(0, 0, canvaswidth, canvasheight);

    // draw the snake
    g.setcolor(color.black);
    linkedlist na = model.nodearray;
    iterator it = na.iterator();
    while (it.hasnext()) {
      node n = (node) it.next();
      drawnode(g, n);
    }

    // draw the food
    g.setcolor(color.red);
    node n = model.food;
    drawnode(g, n);

    updatescore();
  }

  private void drawnode(graphics g, node n) {
    g.fillrect(n.x * nodewidth,
        n.y * nodeheight,
        nodewidth - 1,
        nodeheight - 1);
  }

  public void updatescore() {
    string s = "score: " + model.score;
    labelscore.settext(s);
  }

  public void update(observable o, object arg) {
    repaint();
  }
}

本文的目的就是带着大家回味经典，但是更主要的目的就是帮助大家学习好java程序设计。