坦克大战(一期)-增加子弹类

src/com/msb/Bullet.java

@@ -0,0 +1,44 @@
+package com.msb;
+
+import java.awt.*;
+
+/**
+ * @Author bingor
+ * @Date 2022-09-30 14:33
+ * @Description: 子弹类
+ * @Version: 1.0
+ */
+public class Bullet extends Frame {
+
+    private int x, y;
+    private DirEnum dir;
+    public static final int WIDTH = 8;
+    public static final int HEIGHT = 8;
+    public static final int SPEED = 5;
+
+    public Bullet(int x, int y, DirEnum dir) {
+        this.x = x;
+        this.y = y;
+        this.dir = dir;
+    }
+
+    public void paint(Graphics g) {
+        Color color = g.getColor();
+        g.setColor(Color.RED);
+        g.fillOval(x, y, WIDTH, HEIGHT);
+        g.setColor(color);  //还原画笔原来的颜色
+        moving();
+    }
+
+    public void moving() {
+
+        switch (dir) {
+            case UP: y -= SPEED; break;
+            case DOWN: y += SPEED; break;
+            case LEFT: x -= SPEED; break;
+            case RIGHT: x += SPEED; break;
+            default: break;
+        }
+
+    }
+}

src/com/msb/TankFrame.java

@@ -15,6 +15,7 @@ import java.awt.event.WindowEvent;
 public class TankFrame extends Frame {
 
     Tank tank = new Tank(200, 200, DirEnum.RIGHT);
+    Bullet bullet = new Bullet(200, 200, DirEnum.DOWN);
 
     public TankFrame() {
 
@@ -39,6 +40,7 @@ public class TankFrame extends Frame {
     public void paint(Graphics g) {
         super.paint(g);
         tank.paint(g);
+        bullet.paint(g);
     }
 
     //这里使用内部内的原因是，只有TankFrame用到