属性配置

src/main/java/com/example/tankbattle/Main.java

@@ -4,8 +4,10 @@ public class Main {
     public static void main(String[] args) throws InterruptedException {
         TankFrame tf = new TankFrame();
 
+        int initTankCount = Integer.valueOf(PropertyMgr.get("initTankCount"));
+
         // 初始化敌方坦克
-        for (int i = 0; i < 5; i++) {
+        for (int i = 0; i < initTankCount; i++) {
             tf.tanks.add(new Tank(50 + i * 80, 200, Dir.DOWN, Group.BAD, tf));
         }
 

src/main/java/com/example/tankbattle/PropertyMgr.java

@@ -0,0 +1,29 @@
+package com.example.tankbattle;
+
+import java.io.IOException;
+import java.util.Properties;
+
+public class PropertyMgr {
+    private static Properties properties = new Properties();
+    static {
+        try {
+            properties.load(PropertyMgr.class.getClassLoader().getResourceAsStream("config.properties"));
+        } catch (IOException exception) {
+            exception.printStackTrace();
+        }
+    }
+
+    public static String get(String key) {
+        if (properties == null) {
+            return null;
+        }
+        return properties.getProperty(key);
+    }
+
+    //int getInt(key)
+    //getString(key)
+
+    public static void main(String[] args) {
+        System.out.println(PropertyMgr.get("initTankCount"));
+    }
+}

src/main/java/com/example/tankbattle/TankFrame.java

@@ -20,7 +20,8 @@ public class TankFrame extends Frame {
     List<Explode> explodes = new ArrayList<>();
 
 
-    static final int GAME_WIDTH = 1080, GAME_HEIGHT = 960;
+    static final int GAME_WIDTH = Integer.valueOf(PropertyMgr.get("gameWidth"));
+    static final int GAME_HEIGHT = Integer.valueOf(PropertyMgr.get("gameHeight"));
 
 	public TankFrame() {
         setSize(GAME_WIDTH, GAME_HEIGHT);

src/main/resources/Config.properties

@@ -0,0 +1,6 @@
+# tanks count at initialization
+initTankCount=10
+tankSpeed=5
+bulletSpeed=10
+gameWidth=1080
+gameHeight=720