我正在用Java写一个Flappy Bird游戏的复制品，但是我遇到了一些关于线程的东西。
基本上，到目前为止，我的项目中有4个类。我有<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<connectionStrings>
<add name="SkillManagementEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider connection string="data source=localhost;initial catalog=SkillManagement;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
</configuration>
类可以帮助我渲染游戏，看起来像这样：
Renderer我有import java.awt.Graphics;
import javax.swing.JPanel;
public class Renderer extends JPanel
{
private static final long serialVersionUID = 1L;
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
FlappyBird.flappyBird.repaint(g);
}
}
类帮助我连接到本地托管数据库以保存分数，它看起来像这样：
Database我有一个import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Database {
private static Connection con;
private String driverName = "com.mysql.jdbc.Driver";
public Database(String host, String username, String password){
try {
con = DriverManager.getConnection( host, username, password );
}
catch (SQLException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
try {
Class.forName(driverName).newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
System.err.println(e.getMessage() + "------Cannot Load Driver");
}
}
public void insertRow (Row row)
{
try {
PreparedStatement stmt = con.prepareStatement("insert into Scores (Username, Score, CoinScore) VALUES (?, ?, ?);");
stmt.setString(1, row.getUserName());
stmt.setInt(2, row.getScore());
stmt.setInt(3, row.getCoinScore());
stmt.executeUpdate();
} catch (SQLException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
类，表示即将插入数据库的单行，其文件如下：
Row我有一个名为public class Row {
private String username;
private int score;
private int coinscore;
public Row(String username, int score, int coinscore)
{
this.username = username;
this.score = score;
this.coinscore = coinscore;
}
public String getUserName()
{
return this.username;
}
public int getScore()
{
return this.score;
}
public int getCoinScore()
{
return this.coinscore;
}
}
的主类，它就是游戏本身，看起来像这样：
Flappy Bird当我尝试在数据库中插入新行时出现问题（当设置gameover变量时，即gameover = true）。 显然，应用程序正确地插入数据库，但是当我尝试重放游戏时，我收到一些关于事件调度线程的例外，游戏不再继续。 到目前为止，我已经尝试在数据库中插入数据时停止计时器，然后将其重新启动，但它没有用。 您有什么意见，我该怎么办才能解决这个问题？
P.S：除了这个问题，游戏运行没有任何缺陷。堆栈跟踪：
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.*;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.Timer;
public class FlappyBird implements ActionListener, MouseListener, KeyListener
{
public static FlappyBird flappyBird;
public final int WIDTH = 800, HEIGHT = 800;
public Renderer renderer;
public Rectangle bird;
public ArrayList<Rectangle> columns,coins;
public int ticks, yMotion, score, coinScore;
public boolean gameOver, started;
public Random rand;
public Timer timer;
public FlappyBird()
{
JFrame jframe = new JFrame();
timer = new Timer(50, this);
renderer = new Renderer();
rand = new Random();
jframe.add(renderer);
jframe.setTitle("Flappy Bird");
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setSize(WIDTH, HEIGHT);
jframe.addMouseListener(this);
jframe.addKeyListener(this);
jframe.setResizable(false);
jframe.setVisible(true);
bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 20, 20);
columns = new ArrayList<Rectangle>();
coins = new ArrayList<Rectangle>();
addColumn(true);
addColumn(true);
addColumn(true);
addColumn(true);
timer.start();
}
public void addColumn(boolean start)
{
int space = 300;
int width = 100;
int height = 50 + rand.nextInt(300);
if (start)
{
columns.add(new Rectangle(WIDTH + width + columns.size() * 300, HEIGHT - height - 120, width, height));
coins.add(new Rectangle(WIDTH+10+columns.size()*300,HEIGHT-height-100,15,15));
columns.add(new Rectangle(WIDTH + width + (columns.size() - 1) * 300, 0, width, HEIGHT - height - space));
}
else
{
columns.add(new Rectangle(columns.get(columns.size() - 1).x + 600, HEIGHT - height - 120, width, height));
coins.add(new Rectangle(columns.get(columns.size()-1).x+rand.nextInt(600) + 100,HEIGHT -height - rand.nextInt(100),15,15));
columns.add(new Rectangle(columns.get(columns.size() - 1).x, 0, width, HEIGHT - height - space));
}
}
public void paintColumn(Graphics g, Rectangle column)
{
g.setColor(Color.green.darker());
g.fillRect(column.x, column.y, column.width, column.height);
}
public void paintCoin(Graphics g, Rectangle coin)
{
g.setColor(Color.yellow.darker());
g.fillRect(coin.x, coin.y, coin.width, coin.height);
}
public void paintCoinCyan(Graphics g, Rectangle coin)
{
g.setColor(Color.cyan);
g.fillRect(coin.x, coin.y, coin.width, coin.height);
}
public void jump()
{
if (gameOver)
{
bird = new Rectangle(WIDTH / 2 - 10, HEIGHT / 2 - 10, 20, 20);
columns.clear();
coins.clear();
yMotion = 0;
score = 0;
coinScore = 0;
addColumn(true);
addColumn(true);
addColumn(true);
addColumn(true);
Scanner in = new Scanner(System.in);
Database myDB = new Database("jdbc:mysql://localhost:3306/Leaderboard","root","greenlantern10");
System.out.println("Input your Username: ");
String user = in.next();
in.close();
Row row = new Row(user,score,coinScore);
myDB.insertRow(row);
gameOver = false;
}
if (!started)
{
started = true;
}
else if (!gameOver)
{
if (yMotion > 0)
{
yMotion = 0;
}
yMotion -= 10;
}
}
@Override
public void actionPerformed(ActionEvent e)
{
int speed = 15;
ticks++;
if (started)
{
for (int i = 0; i < columns.size(); i++)
{
Rectangle column = columns.get(i);
column.x -= speed;
}
for (int i = 0; i< coins.size();i++)
{
Rectangle coin = coins.get(i);
coin.x -= speed;
}
if (ticks % 2 == 0 && yMotion < speed)
{
yMotion += 2;
}
for (int i = 0; i < columns.size(); i++)
{
Rectangle column = columns.get(i);
if (column.x + column.width < 0)
{
columns.remove(column);
if (column.y == 0)
{
addColumn(false);
}
}
}
bird.y += yMotion;
for (Rectangle column : columns)
{
if (column.y == 0 && bird.x + bird.width / 2 > column.x + column.width / 2 - 10 && bird.x + bird.width / 2 < column.x + column.width / 2 + 10)
{
score++;
}
if (column.intersects(bird))
{
gameOver = true;
if (bird.x <= column.x)
{
bird.x = column.x - bird.width;
}
else
{
if (column.y != 0)
{
bird.y = column.y - bird.height;
}
else if (bird.y < column.height)
{
bird.y = column.height;
}
}
}
}
for (Rectangle coin : coins)
{
if (bird.intersects(coin))
{
coinScore++;
}
}
if (bird.y > HEIGHT - 120)
{
bird.y = HEIGHT - 120;
}
if (bird.y < 0)
{
gameOver = true;
}
if (bird.y + yMotion >= HEIGHT - 120)
{
bird.y = HEIGHT - 120 - bird.height;
gameOver = true;
}
}
renderer.repaint();
}
public void repaint(Graphics g)
{
g.setColor(Color.cyan);
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setColor(Color.orange);
g.fillRect(0, HEIGHT - 120, WIDTH, 120);
g.setColor(Color.green);
g.fillRect(0, HEIGHT - 120, WIDTH, 20);
g.setColor(Color.red);
g.fillRect(bird.x, bird.y, bird.width, bird.height);
for (Rectangle column : columns)
{
paintColumn(g, column);
}
for (Rectangle coin : coins)
{
paintCoin(g,coin);
}
g.setColor(Color.white);
g.setFont(new Font("SANS_SERIF", 1, 100));
if (!started)
{
g.drawString("Click or press SPACE to start!", 40, HEIGHT / 2 - 50);
}
if (gameOver)
{
g.drawString("Game Over!", 200, HEIGHT / 2 - 60);
}
if (!gameOver && started)
{
g.drawString("Score: "+String.valueOf(score), WIDTH / 2 - 400 , 150);
g.drawString("Coin score: "+String.valueOf(coinScore),WIDTH / 2- 400, 50);
}
}
public static void main(String[] args)
{
flappyBird = new FlappyBird();
}
@Override
public void mouseClicked(MouseEvent e)
{
jump();
}
@Override
public void keyReleased(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_SPACE)
{
jump();
}
}
@Override
public void mousePressed(MouseEvent e)
{
}
@Override
public void mouseReleased(MouseEvent e)
{
}
@Override
public void mouseEntered(MouseEvent e)
{
}
@Override
public void mouseExited(MouseEvent e)
{
}
@Override
public void keyTyped(KeyEvent e)
{
}
@Override
public void keyPressed(KeyEvent e)
{
}
}
答案 0 :(得分：0)
在Jump例程中，您放错了代码。它基本上试图在跳转中扫描播放器（名称）输入。
你的逻辑有两次击中这个例程，第二次失败。可能因为在游戏之间收集的System.in输入而失败。
在查询之前刷新你的System.in，或者更好的是，使用Swing库在游戏中实际询问玩家名称。