？未解决：
全部代码在下，如何实现在gameover时候(running=false)按R键可以重开游戏
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//主程序
public class Main extends GamePanel{
public static void main(String[] args) {
new GameFrame();
}
}
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//在新的GameFrame中创建GamePanel
import javax.swing.JFrame;
public class GameFrame extends JFrame{
GameFrame(){
this.add(new GamePanel());
this.setTitle("Snake Game");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
this.pack();
this.setVisible(true);
this.setLocationRelativeTo(null);
}
}
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//图像绘制，游戏操作代码
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Random;
import javax.swing.JPanel;
import javax.swing.Timer;
public class GamePanel extends JPanel implements ActionListener{
static final int SCREEN_WIDTH=600;
static final int SCREEN_HEIGHT=600;
static final int UNIT_SIZE=25;
static int GAMA_GROUND=(SCREEN_WIDTH*SCREEN_HEIGHT)/UNIT_SIZE;
static final int DELAY=140;
final int x[]=new int[GAMA_GROUND];
final int y[]=new int [GAMA_GROUND];
int snake=5;
int applesEaten;
int appleX;
int appleY;
char direction='R';
public boolean running=false;
Timer timer;
Random random;
GamePanel(){
this.setPreferredSize(new Dimension(SCREEN_WIDTH,SCREEN_HEIGHT));
this.setFocusable(true);
this.addKeyListener(new KAdapter());
this.setBackground(Color.black);
random=new Random();
gameStart();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
draw(g);
}
public void draw(Graphics g) {
if(running) {
//Draw apple
g.setColor(Color.white);
g.fillOval(appleX, appleY, UNIT_SIZE, UNIT_SIZE);
//Draw Snake
for(int i=0;i<snake;i++) {
//Head of Snake
if(i==0) {
g.setColor(Color.white);
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
}
//Body of Snake
else {
g.setColor(Color.gray);
g.fillRect(x[i], y[i], UNIT_SIZE, UNIT_SIZE);
}
}
}
else {
gameEnd(g);
}
}
public void gameStart() {
running=true;
createApple();
timer=new Timer(DELAY,this);
timer.start();
}
public void createApple() {
//Set apple random location
appleX=random.nextInt((int)(SCREEN_WIDTH/UNIT_SIZE))*UNIT_SIZE;
appleY=random.nextInt((int)(SCREEN_HEIGHT/UNIT_SIZE))*UNIT_SIZE;
}
public void checkApple() {
//Make apple Edible
if((x[0]==appleX)&&(y[0]==appleY)){
snake++;
applesEaten++;
createApple();
}
}
public void move() {
//借助char变量“direction”进行方向判断和移动
for(int i=snake;i>0;i--) {
x[i]=x[i-1];
y[i]=y[i-1];
}
switch(direction) {
case 'U':
y[0]=y[0]-UNIT_SIZE;
break;
case 'D':
y[0]=y[0]+UNIT_SIZE;
break;
case 'L':
x[0]=x[0]-UNIT_SIZE;
break;
case 'R':
x[0]=x[0]+UNIT_SIZE;
break;
}
}
public void checkCollision() {
for(int i=snake;i>0;i--) {
//Game end when head touching body
if((x[0]==x[i])&&(y[0]==y[i])){
running=false;
}
//Game end when head spanned the game field
if((x[0]<0)||(x[0]>SCREEN_WIDTH)||(y[0]<0)||(y[0]>SCREEN_HEIGHT)) {
running=false;
}
}
}
private void gameEnd(Graphics g) {
this.setBackground(Color.gray);
g.setColor(Color.black);
//"Greedy Snake"
g.setFont(new Font("Impact",Font.BOLD,30));
g.drawString("Greedy Snake"+applesEaten,SCREEN_WIDTH/3, g.getFont().getSize());
//"Score - "
g.setFont(new Font(null,Font.BOLD,25));
g.drawString("Score - "+applesEaten,SCREEN_WIDTH/6, 100);
g.setFont(new Font(null,Font.ROMAN_BASELINE,15));
g.drawString("press 'R' to restart ", SCREEN_WIDTH/6, 170);
g.drawString("press 'ESC' to quit ", SCREEN_WIDTH/6,195);
}
@Override
public void actionPerformed(ActionEvent e) {
if(running) {move();checkApple();checkCollision();}
repaint();
}
public class KAdapter extends KeyAdapter{
@Override
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()) {
case KeyEvent.VK_LEFT:
if(direction!='R') {
direction='L';
}
break;
case KeyEvent.VK_RIGHT:
if(direction!='L') {
direction='R';
}
break;
case KeyEvent.VK_UP:
if(direction!='D') {
direction='U';
}
break;
case KeyEvent.VK_DOWN:
if(direction!='U') {
direction='D';
}
break;
case KeyEvent.VK_R:
if(!running) {
//需要解决的地方.实现按R键重开游戏
}
case KeyEvent.VK_ESCAPE:
if(!running) {
System.exit(0);
}
}
}
}
}
