How to write the code to implement the Snake War mini game in Java

Effect display

Effect display

1. Game interface

##2. Score situation

Project introduction

Project background

The "Snake Battle" game is A classic game, it is easy to operate and highly entertaining. It has been deeply loved by computer players since the computer was implemented. This project is based on Java technology and developed a "Snake" game with simple operation, beautiful interface and complete functions. "game. This game was developed to help learn Java technology and understand the software development process.

General requirements

This system is mainly used to complete the basic operations of the Snake game. Users can practice and entertain themselves. The following requirements need to be met:

(1) Use the direction keys to change the running direction of the snake.

(2) The space key pauses or continues the game and generates food in random places.
(3) After eating food, it turns into a new snake body (the length of the snake body becomes longer and the game continues).

Implementation process

(1) Draw the form object.

(2) Static UI design (including snakes, food, game area and title area).
(3) Use keyboard listening events and timers to realize the movement of the snake.
(4) Realization of collision between small snake and food.
(5) Define a variable to store the length of the snake, and traverse the array to realize the function of increasing the body of the snake.
(6) Exit condition: When the game points reach the specified score, the game will exit.

Code display

Main class: Demo class

package Demo;
/**
 * 1.画出窗体对象
 * 
 * 
 * @author 青00-Java
 *
 */
public class Demo0 {
 
}

MyPanel class construction method

package Demo;
 
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
 
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.Timer;
//画布类
public class MyPanel extends JPanel implements KeyListener,ActionListener{//继承
	private static final Component This = null;
//键盘监听交互接口
int length;
int score;
int[] snakeX=new int[500];//坐标
int[] snakeY=new int[500];
String fx;
boolean ifStart=false;
//定时器
Timer timer =new Timer(100,this);
int foodx;
int foody;
Random random =new Random();
 
public MyPanel(){
	init();
	//添加监听事件
	this.setFocusable(true);
	this.addKeyListener(this);
	score=0;
}

Initialization method

public void init(){
	length=3;
	fx="r";
	//初始化小蛇的位置
	snakeX[0]=100;
	snakeY[0]=150;
	snakeX[1]=75;
	snakeY[1]=150;
	snakeX[2]=50;
	snakeY[2]=150;
	foodx=25+25*random.nextInt(57);
	foody=125+25*random.nextInt(27);
	System.out.println(foodx);
	System.out.println(foody);
	timer.start();
}

Drawing Method

	@Override
	 protected void paintComponent(Graphics g){//画笔对象
		 super.paintComponent(g);
		 //绘制顶部的标题
		 new ImageIcon("C:/Users/Desktop/img/title2.png").paintIcon(this,g,25,11);//创建对象
		 //绘制游戏区域
		 g.fillRect(25, 125, 1450, 700);
		 //绘制小蛇
		 //蛇头
		 new ImageIcon("C:/Users/Desktop/img/l.png").paintIcon(this, g, snakeX[0], snakeY[0]);
			 
		 //蛇身
		 for(int i=1;i<length;i++){
			 new ImageIcon("C:/Users/Desktop/img/body.png").paintIcon(This, g, snakeX[i], snakeY[i]);
		 }
		 //游戏的提示语
		 if(ifStart==false){
			 g.setColor(Color.white);
			 g.setFont(new Font("微软雅黑",Font.BOLD,40));
			 g.drawString("按压空格键继续游戏", 550,500);
			 g.drawString("无尽模式", 650,400);
		 }
		 //画出食物的位置
		 new ImageIcon("C:/Users/Desktop/img/body.png").paintIcon(this, g, foodx, foody);
	}
	
	@Override//按压
	public void keyPressed(KeyEvent e) {
		int keyCode=e.getKeyCode();
		if(keyCode==KeyEvent.VK_SPACE){
			ifStart=!ifStart;
		}
		if(ifStart==true){
			if(keyCode==KeyEvent.VK_LEFT&&fx!="r"){
				fx="l";
			}else if(keyCode==KeyEvent.VK_RIGHT&&fx!="l"){
				fx="r";
			}else if(keyCode==KeyEvent.VK_UP&&fx!="d"){
				fx="u";
			}else if(keyCode==KeyEvent.VK_DOWN&&fx!="u"){
				fx="d";
			}
	}
		repaint();
}

Timer execution method

@Override
	public void actionPerformed(ActionEvent e) {
		//改变蛇的位置
		if(ifStart==true){
			for(int i=length-1;i>0;i--){
				snakeX[i]=snakeX[i-1];
				snakeY[i]=snakeY[i-1];
			}
			if(fx.equals("l")){
				snakeX[0]=snakeX[0]-25;
			    if(snakeX[0]<25){
					snakeX[0]=1450;
				}
			}else if(fx.equals("r")){
				snakeX[0]=snakeX[0]+25;
				if(snakeX[0]>1450){
					snakeX[0]=25;
				}
			}else if(fx.equals("u")){
				snakeY[0]=snakeY[0]-25;
				if(snakeY[0]<120){
					snakeY[0]=800;
				}
			}else if(fx.equals("d")){
				snakeY[0]=snakeY[0]+25;
				if(snakeY[0]>800){
					snakeY[0]=120;
				}
			}
			//判断是否吃了食物
			if(snakeX[0]==foodx&&snakeY[0]==foody){
				length++;
				score++;
				if(score==100){
					ifStart=!ifStart;
				}
				foodx=25+25*random.nextInt(57);
				foody=125+25*random.nextInt(27);
				System.out.print("当前食物坐标("+foodx+",");
				System.out.print(foody+")");
				System.out.println("|||当前分数："+score+" ");
			}
			repaint();
		}
		timer.start();
	}
	
	@Override
	public void keyReleased(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}
	@Override
	public void keyTyped(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}
}

Framework Ui class

package Demo;
 
import javax.swing.JFrame;
 
public class Ui {
 
	public static void main(String[] args){
		JFrame frame=new JFrame("无尽版贪吃蛇");
		frame.setSize(1500, 900);
		frame.setLocationRelativeTo(null);//居中显示
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setResizable(true);
		frame.add(new MyPanel());
		frame.setVisible(true);
	}
 
}

Project structure

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