游戏玩法：通过鼠标点击使小鸟上下移动穿过柱子并完成得分，小鸟碰到柱子或掉落到地面上都会结束游戏。
（游戏内图片）
下面是实现这个游戏的代码：
Brid类：
package bird;import org.omg.CORBA.IMP_LIMIT;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;public class Brid {int x,y;int width,height;int size;//鸟的大小，用于检测碰撞BufferedImage image;
BufferedImage[] images;
int index;double g; //重力加速度double t; //两次位置的时间间隔double v0; //初始上抛的速度double speed; //当前上抛的速度double s; //经过时间t以后的位移double alpha; //鸟的倾角，单位是弧度public Brid() throws Exception {image = ImageIO.read(getClass().getResource("0.png"));width = image.getWidth();height = image.getHeight();x = 132;y = 280;size = 40;g = 4;v0 = 20;t = 0.25;speed = v0;s = 0;alpha = 0;images = new BufferedImage[8];for (int i = 0; i < 8; i++) {images[i] = ImageIO.read(getClass().getResource(i + ".png"));}
index=0;}
public void fly(){index++;image=images[(index/12)%8];
}public void step(){
double v0=speed;
s=v0*t+g*t*t/2; //计算上抛运动的位移;
y=y-(int)s;//计算鸟的位置坐标
double v =v0-g*t;//计算下次的速度
speed=v;
alpha=Math.atan(s/8);}
public void flappy(){speed=v0; //重新设置初始速度，重新向上飞
}public boolean hit( Ground ground){boolean hit=y+size/2>ground.y;if(hit){y= ground.y-size/2;alpha=-3.1415926/2;}return hit;}public boolean hit(Column column) {if (x > column.x - column.width / 2 - size / 2 && x < column.x + column.width / 2 + size / 2) {if (y > column.y - column.gap / 2 + size / 2 && y < column.y + column.gap / 2 - size / 2) {return false;}return true;}return false;}
}BridGame类：
package bird;import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;public class BridGame extends JPanel {Brid brid;Column column1,column2;Ground ground;BufferedImage background;int score;// boolean gameOver;//游戏状态int state;public static final int START=0;public static final int RUNNING=1;public static final int GAME_OVER=2;BufferedImage gameOverImage;
BufferedImage startImage;public BridGame() throws Exception{//gameOver=false;state=START;gameOverImage =ImageIO.read(getClass().getResource("gameover.png"));startImage=ImageIO.read(getClass().getResource("start.png"));brid=new Brid();column1=new Column(1);column2=new Column(2);ground=new Ground();background= ImageIO.read(getClass().getResource("bg.png"));score=0;
}@Overridepublic void paint(Graphics g) {super.paint(g);g.drawImage(background,0,0,null);g.drawImage(column1.image,column1.x-column1.width/2,column1.y-column1.height/2,null);g.drawImage(column2.image,column2.x-column2.width/2,column2.y-column2.height/2,null);g.drawImage(ground.image,ground.x,ground.y,null);Graphics2D g2=(Graphics2D) g;g2.rotate(-brid.alpha,brid.x,brid.y);g.drawImage(brid.image,brid.x-brid.width/2,brid.y-brid.width/2,null);g2.rotate(brid.alpha,brid.x,brid.y);Font f=new Font(Font.SANS_SERIF,Font.BOLD,40);g.setFont(f);g.drawString(""+score,40,60);g.setColor(Color.white);g.drawString(""+score,40-3,60-3);switch (state){case GAME_OVER:g.drawImage(gameOverImage,0,0,null);break;case START:g.drawImage(startImage,0,0,null);break;}}public void action() throws Exception{ //让地面动起来MouseListener l=new MouseAdapter(){@Overridepublic void mousePressed(MouseEvent e) { //鼠标按下// brid.flappy(); //鸟向上飞try {switch (state) {case GAME_OVER:column1 = new Column(1);column2 = new Column(2);brid = new Brid();score = 0;state = START;break;case START:state = RUNNING;case RUNNING:brid.flappy();}}catch (Exception e2){}}};addMouseListener(l);while(true){switch (state){case START:brid.fly();ground.step();break;case RUNNING:ground.step();column1.step();column2.step();brid.step();brid.fly();if(brid.x==column1.x||brid.x==column2.x){score++;}if(brid.hit(ground)||brid.hit(column1)||brid.hit(column2)){state=GAME_OVER;}break;}repaint();Thread.sleep(1000/30);}
}public static void main(String[] args) throws Exception {JFrame frame=new JFrame();BridGame game=new BridGame();frame.add(game);frame.setSize(440,670);frame.setLocationRelativeTo(null);frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);game.action();}
}Column类
package bird;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.LineMetrics;
import java.awt.image.BufferedImage;
import java.util.Random;//柱子
public class Column {int x,y;int width,height;int gap;int distance;BufferedImage image;Random random=new Random();public Column(int n) throws Exception{image= ImageIO.read(getClass().getResource("column.png"));width=image.getWidth();height =image.getHeight();gap=144;distance=245;x=550+(n-1)*distance;y=random.nextInt(218)+132;}
public void step(){x--;if(x==-width/2){x=distance*2-width/2;y=random.nextInt(218)+132;}
}
}Ground类：
package bird;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;public class Ground {int x,y;int width,height;BufferedImage image;public Ground() throws Exception{image= ImageIO.read(getClass().getResource("ground.png"));width=image.getWidth();height =image.getHeight();x=0;y=500;}//添加方法让地面移动public void step(){x--;if(x==-109){x=0;}}}
