diff --git a/docs/坦克大战笔记.docx b/docs/坦克大战笔记.docx
index 8435f34..b3f2d42 100644
Binary files a/docs/坦克大战笔记.docx and b/docs/坦克大战笔记.docx differ
diff --git a/src/com/demo/tank/audio/explode.wav b/src/audio/explode.wav
similarity index 100%
rename from src/com/demo/tank/audio/explode.wav
rename to src/audio/explode.wav
diff --git a/src/com/demo/tank/audio/tank_fire.wav b/src/audio/tank_fire.wav
similarity index 100%
rename from src/com/demo/tank/audio/tank_fire.wav
rename to src/audio/tank_fire.wav
diff --git a/src/com/demo/tank/audio/tank_move.wav b/src/audio/tank_move.wav
similarity index 100%
rename from src/com/demo/tank/audio/tank_move.wav
rename to src/audio/tank_move.wav
diff --git a/src/com/demo/tank/audio/war1.wav b/src/audio/war1.wav
similarity index 100%
rename from src/com/demo/tank/audio/war1.wav
rename to src/audio/war1.wav
diff --git a/src/com/demo/tank/course4/Bullet.java b/src/com/demo/tank/course4/Bullet.java
new file mode 100644
index 0000000..4beea81
--- /dev/null
+++ b/src/com/demo/tank/course4/Bullet.java
@@ -0,0 +1,117 @@
+package com.demo.tank.course4;
+
+import java.awt.*;
+
+public class Bullet {
+    private int x, y;
+    private Direction direction;
+    private static final int SPEED = 5;
+    public static final int WIDTH = ResourceManager.bulletD.getWidth();
+    public static final int HEIGHT = ResourceManager.bulletD.getHeight();
+    private boolean live = true;
+    private Group group = Group.BAD;
+    private TankFrameV4 tf;
+
+    public Bullet(int x, int y, Direction direction, Group group, TankFrameV4 tf) {
+        this.x = x;
+        this.y = y;
+        this.direction = direction;
+        this.group = group;
+        this.tf = tf;
+    }
+
+    public void paint(Graphics g){
+        if(!live){
+            tf.bullets.remove(this);
+        }
+        switch (direction){
+            case UP:
+                g.drawImage(ResourceManager.bulletU, x, y, null);
+                break;
+            case DOWN:
+                g.drawImage(ResourceManager.bulletD, x, y, null);
+                break;
+            case LEFT:
+                g.drawImage(ResourceManager.bulletL, x, y, null);
+                break;
+            case RIGHT:
+                g.drawImage(ResourceManager.bulletR, x, y, null);
+                break;
+        }
+        move();
+    }
+
+    private void move() {
+        switch (direction){
+            case UP: y -= SPEED;
+                break;
+            case DOWN: y += SPEED;
+                break;
+            case LEFT: x -= SPEED;
+                break;
+            case RIGHT: x += SPEED;
+                break;
+            default:
+                break;
+        }
+        if(x < 0 || y < 0 || x > TankFrameV4.GAME_WIDTH || y > TankFrameV4.GAME_HEIGHT){
+            live = false;
+        }
+    }
+
+    //检测是否跟坦克碰撞
+    public void collideWith(Tank tank){
+        //关闭队友伤害
+        if(this.group == tank.getGroup()) return;
+        Rectangle bulletRect = new Rectangle(x, y, WIDTH, HEIGHT);
+        Rectangle tankRect = new Rectangle(tank.getX(), tank.getY(), Tank.WIDTH, Tank.HEIGHT);
+        if(bulletRect.intersects(tankRect)){
+            tank.die();
+            this.die();
+        }
+    }
+
+    private void die() {
+        this.live = false;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public void setX(int x) {
+        this.x = x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public void setY(int y) {
+        this.y = y;
+    }
+
+    public Direction getDirection() {
+        return direction;
+    }
+
+    public void setDirection(Direction direction) {
+        this.direction = direction;
+    }
+
+    public boolean isLive() {
+        return live;
+    }
+
+    public void setLive(boolean live) {
+        this.live = live;
+    }
+
+    public Group getGroup() {
+        return group;
+    }
+
+    public void setGroup(Group group) {
+        this.group = group;
+    }
+}
diff --git a/src/com/demo/tank/course4/Direction.java b/src/com/demo/tank/course4/Direction.java
new file mode 100644
index 0000000..5427a9b
--- /dev/null
+++ b/src/com/demo/tank/course4/Direction.java
@@ -0,0 +1,5 @@
+package com.demo.tank.course4;
+
+public enum Direction {
+    LEFT, RIGHT, UP, DOWN;
+}
diff --git a/src/com/demo/tank/course4/Explode.java b/src/com/demo/tank/course4/Explode.java
new file mode 100644
index 0000000..7fbf453
--- /dev/null
+++ b/src/com/demo/tank/course4/Explode.java
@@ -0,0 +1,46 @@
+package com.demo.tank.course4;
+
+import com.demo.tank.util.Audio;
+
+import java.awt.*;
+
+public class Explode {
+    private int x, y;
+    public static final int WIDTH = ResourceManager.explodes[0].getWidth();
+    public static final int HEIGHT = ResourceManager.explodes[0].getHeight();
+    private boolean living = true;
+    private TankFrameV4 tf;
+
+    private int step = 0;
+
+    public Explode(int x, int y, TankFrameV4 tf) {
+        this.x = x;
+        this.y = y;
+        this.tf = tf;
+//        new Thread(() -> new Audio("audio/explode.wav").play()).start();
+    }
+
+    public void paint(Graphics g){
+        g.drawImage(ResourceManager.explodes[step++], x, y, null);
+        if(step >= ResourceManager.explodes.length){
+            step = 0;
+        }
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public void setX(int x) {
+        this.x = x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public void setY(int y) {
+        this.y = y;
+    }
+
+}
diff --git a/src/com/demo/tank/course4/Group.java b/src/com/demo/tank/course4/Group.java
new file mode 100644
index 0000000..07b5304
--- /dev/null
+++ b/src/com/demo/tank/course4/Group.java
@@ -0,0 +1,5 @@
+package com.demo.tank.course4;
+
+public enum Group {
+    GOOD, BAD
+}
diff --git a/src/com/demo/tank/course4/MainV4.java b/src/com/demo/tank/course4/MainV4.java
new file mode 100644
index 0000000..0c799f5
--- /dev/null
+++ b/src/com/demo/tank/course4/MainV4.java
@@ -0,0 +1,21 @@
+package com.demo.tank.course4;
+
+import com.demo.tank.util.Audio;
+
+import java.io.IOException;
+
+public class MainV4 {
+    public static void main(String[] args) throws InterruptedException, IOException {
+        TankFrameV4 tf = new TankFrameV4();
+        for(int i = 0; i < 5; i++){
+            tf.enemyTanks.add(new Tank(50 + i*80, 200, Direction.DOWN, Group.BAD, tf));
+        }
+
+//        new Thread(() -> new Audio("audio/war1.wav").loop()).start();
+
+        while (true){
+            Thread.sleep(50);
+            tf.repaint();
+        }
+    }
+}
diff --git a/src/com/demo/tank/course4/ResourceManager.java b/src/com/demo/tank/course4/ResourceManager.java
new file mode 100644
index 0000000..3a47bce
--- /dev/null
+++ b/src/com/demo/tank/course4/ResourceManager.java
@@ -0,0 +1,33 @@
+package com.demo.tank.course4;
+
+import com.demo.tank.util.ImageUtil;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+public class ResourceManager {
+    public static BufferedImage tankL, tankR, tankU, tankD;
+    public static BufferedImage bulletL, bulletR, bulletU, bulletD;
+    public static BufferedImage[] explodes = new BufferedImage[16];
+
+    static {
+        try {
+            tankU = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/BadTank1.png"));
+            tankL = ImageUtil.rotateImage(tankU, -90);
+            tankR = ImageUtil.rotateImage(tankU, 90);
+            tankD = ImageUtil.rotateImage(tankU, 180);
+
+            bulletL = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/bulletL.gif"));
+            bulletR = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/bulletR.gif"));
+            bulletU = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/bulletU.gif"));
+            bulletD = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/bulletD.gif"));
+
+            for (int i= 0; i<16; i++){
+                explodes[i] = ImageIO.read(ResourceManager.class.getClassLoader().getResourceAsStream("images/e"+ (i+1)+".gif"));
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/com/demo/tank/course4/Tank.java b/src/com/demo/tank/course4/Tank.java
new file mode 100644
index 0000000..4fcf7dc
--- /dev/null
+++ b/src/com/demo/tank/course4/Tank.java
@@ -0,0 +1,121 @@
+package com.demo.tank.course4;
+
+import java.awt.*;
+import java.util.Random;
+
+public class Tank {
+    private int x,y;
+    private Direction dir;
+    private static final int SPEED = 8;
+    private boolean moving = false;
+    private boolean living = true;
+    private Group group = Group.BAD;
+    private TankFrameV4 tankFrame;
+    public static final int WIDTH = ResourceManager.tankD.getWidth();
+    public static final int HEIGHT = ResourceManager.tankD.getHeight();
+    private Random random = new Random();
+
+    public Tank(int x, int y, Direction dir, Group group, TankFrameV4 tankFrame) {
+        this.x = x;
+        this.y = y;
+        this.dir = dir;
+        this.group = group;
+        this.tankFrame = tankFrame;
+    }
+
+    public void paint(Graphics g) {
+        if(!living) tankFrame.enemyTanks.remove(this);
+        //根据方向绘制坦克
+        switch (dir){
+            case UP:
+                g.drawImage(ResourceManager.tankU, x, y, null);
+            break;
+            case DOWN:
+                g.drawImage(ResourceManager.tankD, x, y, null);
+                break;
+            case LEFT:
+                g.drawImage(ResourceManager.tankL, x, y, null);
+                break;
+            case RIGHT:
+                g.drawImage(ResourceManager.tankR, x, y, null);
+                break;
+        }
+        move();
+    }
+
+    public void move(){
+        //如果没有移动 return
+        if(!moving) return;
+        switch (dir){
+            case UP: y -= SPEED;
+                break;
+            case DOWN: y += SPEED;
+                break;
+            case LEFT: x -= SPEED;
+                break;
+            case RIGHT: x += SPEED;
+                break;
+            default:
+                break;
+        }
+//        if(random.nextInt(10) > 8) this.fire();
+    }
+
+    public void fire() {
+        int bx = x + Tank.WIDTH/2 - Bullet.WIDTH/2;
+        int by = y + Tank.HEIGHT/2 - Bullet.HEIGHT/2;
+        tankFrame.bullets.add(new Bullet(bx, by, this.dir, this.group, tankFrame));
+    }
+
+    public void die(){
+        this.living = false;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public void setX(int x) {
+        this.x = x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public void setY(int y) {
+        this.y = y;
+    }
+
+    public Direction getDir() {
+        return dir;
+    }
+
+    public void setDir(Direction dir) {
+        this.dir = dir;
+    }
+
+    public boolean isMoving() {
+        return moving;
+    }
+
+    public void setMoving(boolean moving) {
+        this.moving = moving;
+    }
+
+    public boolean isLiving() {
+        return living;
+    }
+
+    public void setLiving(boolean living) {
+        this.living = living;
+    }
+
+    public Group getGroup() {
+        return group;
+    }
+
+    public void setGroup(Group group) {
+        this.group = group;
+    }
+}
diff --git a/src/com/demo/tank/course4/TankFrameV4.java b/src/com/demo/tank/course4/TankFrameV4.java
new file mode 100644
index 0000000..dc4e6be
--- /dev/null
+++ b/src/com/demo/tank/course4/TankFrameV4.java
@@ -0,0 +1,151 @@
+package com.demo.tank.course4;
+
+import java.awt.*;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TankFrameV4 extends Frame {
+    public static final int GAME_WIDTH = 800;
+    public static final int GAME_HEIGHT = 600;
+    Image image = null;
+
+    Tank tank = new Tank(500, 500, Direction.UP, Group.GOOD,this);
+//    Bullet bullet = new Bullet(520, 440, Direction.UP);
+    List<Bullet> bullets = new ArrayList();
+    List<Tank> enemyTanks = new ArrayList<>();
+    Explode explode = new Explode(200, 300, this);
+
+    public TankFrameV4(){
+        setVisible(true);
+        setBounds(500, 200 , GAME_WIDTH, GAME_HEIGHT);
+        setResizable(false);
+        setTitle("tank war");
+        this.addKeyListener(new MyKeyListener());
+        this.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                System.exit(0);
+            }
+        });
+    }
+
+    @Override
+    public void update(Graphics g) {
+        if(image == null){
+            image = this.createImage(GAME_WIDTH, GAME_HEIGHT);
+        }
+        Graphics imgGraphic =  image.getGraphics();
+        Color color = g.getColor();
+        imgGraphic.setColor(Color.BLACK);
+        imgGraphic.fillRect(0,0, GAME_WIDTH, GAME_HEIGHT);
+        imgGraphic.setColor(color);
+        paint(imgGraphic);
+        g.drawImage(image, 0, 0, null);
+    }
+
+    @Override
+    public void paint(Graphics g){
+        //打印出子弹数量
+        Color color = g.getColor();
+        g.setColor(Color.WHITE);
+        g.drawString("当前子弹数量:" + bullets.size(), 60, 50);
+        g.drawString("当前敌人数量:" + enemyTanks.size(), 60, 80);
+        g.setColor(color);
+
+        tank.paint(g);
+
+        explode.paint(g);
+
+        for(int i = 0; i< enemyTanks.size(); i++){
+            enemyTanks.get(i).paint(g);
+        }
+
+        for (int i = 0; i< bullets.size(); i++){
+            bullets.get(i).paint(g);
+        }
+
+        for(int i = 0; i< bullets.size(); i++){
+            for(int j=0; j< enemyTanks.size(); j++){
+                bullets.get(i).collideWith(enemyTanks.get(j));
+            }
+        }
+//        for(Iterator<Bullet> it = bullets.iterator(); it.hasNext();){
+//            Bullet b = it.next();
+//            if(!b.isLive()){
+//                it.remove();
+//            }
+//        }
+//
+//        for (Bullet b : bullets){
+//            b.paint(g);
+//        }
+    }
+
+    class MyKeyListener extends KeyAdapter{
+        boolean bL = false;
+        boolean bR = false;
+        boolean bU = false;
+        boolean bD = false;
+
+        @Override
+        public void keyPressed(KeyEvent e) {
+            switch (e.getKeyCode()){
+                case KeyEvent.VK_A:
+                    bL = true;
+                    break;
+                case KeyEvent.VK_D:
+                    bR = true;
+                    break;
+                case KeyEvent.VK_W:
+                        bU = true;
+                        break;
+                case KeyEvent.VK_S:
+                    bD = true;
+                    break;
+                default:
+                    break;
+            }
+            setTankDirection();
+        }
+
+        @Override
+        public void keyReleased(KeyEvent e) {
+            switch (e.getKeyCode()){
+                case KeyEvent.VK_A:
+                    bL = false;
+                    break;
+                case KeyEvent.VK_D:
+                    bR = false;
+                    break;
+                case KeyEvent.VK_W:
+                    bU = false;
+                    break;
+                case KeyEvent.VK_S:
+                    bD = false;
+                    break;
+                case KeyEvent.VK_J:
+                    tank.fire();
+                    break;
+                default:
+                    break;
+            }
+            setTankDirection();
+        }
+
+        public void setTankDirection(){
+            if(!bL && !bR && !bU && !bD){
+                tank.setMoving(false);
+            }else{
+                tank.setMoving(true);
+                if(bL) tank.setDir(Direction.LEFT);
+                if(bR) tank.setDir(Direction.RIGHT);
+                if(bU) tank.setDir(Direction.UP);
+                if(bD) tank.setDir(Direction.DOWN);
+            }
+        }
+    }
+}
diff --git a/src/com/demo/tank/util/Audio.java b/src/com/demo/tank/util/Audio.java
new file mode 100644
index 0000000..7336d7b
--- /dev/null
+++ b/src/com/demo/tank/util/Audio.java
@@ -0,0 +1,99 @@
+
+package com.demo.tank.util;
+
+import java.io.IOException;
+
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.DataLine;
+import javax.sound.sampled.FloatControl;
+import javax.sound.sampled.SourceDataLine;
+
+public class Audio {
+
+	byte[] b = new byte[1024 * 1024 * 15];
+
+	
+	public void loop() {
+		try {
+
+			while (true) {
+				int len = 0;
+				sourceDataLine.open(audioFormat, 1024 * 1024 * 15);
+				sourceDataLine.start();
+				//System.out.println(audioInputStream.markSupported());
+				audioInputStream.mark(12358946);
+				while ((len = audioInputStream.read(b)) > 0) {
+					sourceDataLine.write(b, 0, len);
+				}
+				audioInputStream.reset();
+
+				sourceDataLine.drain();
+				sourceDataLine.close();
+			}
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	private AudioFormat audioFormat = null;
+	private SourceDataLine sourceDataLine = null;
+	private DataLine.Info dataLine_info = null;
+
+	private AudioInputStream audioInputStream = null;
+
+	public Audio(String fileName) {
+		try {
+			audioInputStream = AudioSystem.getAudioInputStream(Audio.class.getClassLoader().getResource(fileName));
+			audioFormat = audioInputStream.getFormat();
+			dataLine_info = new DataLine.Info(SourceDataLine.class, audioFormat);
+			sourceDataLine = (SourceDataLine) AudioSystem.getLine(dataLine_info);
+			//FloatControl volctrl=(FloatControl)sourceDataLine.getControl(FloatControl.Type.MASTER_GAIN);   
+			//volctrl.setValue(-40);// 
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	public void play() {
+		try {
+			byte[] b = new byte[1024*5];
+			int len = 0;
+			sourceDataLine.open(audioFormat, 1024*5);
+			sourceDataLine.start();
+			//System.out.println(audioInputStream.markSupported());
+			audioInputStream.mark(12358946);
+			while ((len = audioInputStream.read(b)) > 0) {
+				sourceDataLine.write(b, 0, len);
+			}
+			// audioInputStream.reset();
+
+			sourceDataLine.drain();
+			sourceDataLine.close();
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	
+
+	public void close() {
+		try {
+			audioInputStream.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	public static void main(String[] args) {
+		// Audio a = new Audio("audio/explode.wav");
+		Audio a = new Audio("audio/war1.wav");
+		a.loop();
+
+	}
+
+}
diff --git a/src/com/demo/tank/util/ImageUtil.java b/src/com/demo/tank/util/ImageUtil.java
new file mode 100644
index 0000000..4ddfa0b
--- /dev/null
+++ b/src/com/demo/tank/util/ImageUtil.java
@@ -0,0 +1,24 @@
+package com.demo.tank.util;
+
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+
+public class ImageUtil {
+	public static BufferedImage rotateImage(final BufferedImage bufferedimage,
+            final int degree) {
+        int w = bufferedimage.getWidth();
+        int h = bufferedimage.getHeight();
+        int type = bufferedimage.getColorModel().getTransparency();
+        BufferedImage img;
+        Graphics2D graphics2d;
+        (graphics2d = (img = new BufferedImage(w, h, type))
+                .createGraphics()).setRenderingHint(
+                RenderingHints.KEY_INTERPOLATION,
+                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
+        graphics2d.drawImage(bufferedimage, 0, 0, null);
+        graphics2d.dispose();
+        return img;
+    }
+}
diff --git a/src/com/demo/tank/images/0.gif b/src/images/0.gif
similarity index 100%
rename from src/com/demo/tank/images/0.gif
rename to src/images/0.gif
diff --git a/src/com/demo/tank/images/1.gif b/src/images/1.gif
similarity index 100%
rename from src/com/demo/tank/images/1.gif
rename to src/images/1.gif
diff --git a/src/com/demo/tank/images/10.gif b/src/images/10.gif
similarity index 100%
rename from src/com/demo/tank/images/10.gif
rename to src/images/10.gif
diff --git a/src/com/demo/tank/images/2.gif b/src/images/2.gif
similarity index 100%
rename from src/com/demo/tank/images/2.gif
rename to src/images/2.gif
diff --git a/src/com/demo/tank/images/3.gif b/src/images/3.gif
similarity index 100%
rename from src/com/demo/tank/images/3.gif
rename to src/images/3.gif
diff --git a/src/com/demo/tank/images/4.gif b/src/images/4.gif
similarity index 100%
rename from src/com/demo/tank/images/4.gif
rename to src/images/4.gif
diff --git a/src/com/demo/tank/images/5.gif b/src/images/5.gif
similarity index 100%
rename from src/com/demo/tank/images/5.gif
rename to src/images/5.gif
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similarity index 100%
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diff --git a/src/com/demo/tank/images/GoodTank1.png b/src/images/GoodTank1.png
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diff --git a/src/com/demo/tank/images/missileLD.gif b/src/images/missileLD.gif
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similarity index 100%
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diff --git a/src/com/demo/tank/images/missileRU.gif b/src/images/missileRU.gif
similarity index 100%
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diff --git a/src/com/demo/tank/images/square0.jpg b/src/images/square0.jpg
similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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diff --git a/src/com/demo/tank/images/square4.jpg b/src/images/square4.jpg
similarity index 100%
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diff --git a/src/com/demo/tank/images/square5.jpg b/src/images/square5.jpg
similarity index 100%
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diff --git a/src/com/demo/tank/images/square6.jpg b/src/images/square6.jpg
similarity index 100%
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diff --git a/src/com/demo/tank/images/tank.png b/src/images/tank.png
similarity index 100%
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diff --git a/src/com/demo/tank/images/tankL.gif b/src/images/tankL.gif
similarity index 100%
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diff --git a/src/com/demo/tank/images/tankLD.gif b/src/images/tankLD.gif
similarity index 100%
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diff --git a/src/com/demo/tank/images/tankLU.gif b/src/images/tankLU.gif
similarity index 100%
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diff --git a/src/com/demo/tank/images/tankR.gif b/src/images/tankR.gif
similarity index 100%
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diff --git a/src/com/demo/tank/images/tankRD.gif b/src/images/tankRD.gif
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diff --git a/src/com/demo/tank/images/tankRU.gif b/src/images/tankRU.gif
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diff --git a/src/com/demo/tank/images/tankU.gif b/src/images/tankU.gif
similarity index 100%
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