浮点变量在没有明确赋值的情况下被改变。

huangapple
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英文:

float variable beign changed without beign explicitely atributted

问题

我甚至不知道如何描述我现在遇到的这种奇怪行为，但问题是：

我有一个名为 Player.java 的类，其中有一个私有的浮点数 life，非常基础。
这个浮点数有它自己的设置器/获取器，没有其他方式可以在不使用获取器/设置器的情况下检索/赋值这个变量。

另外，我在每个获取器/设置器中都放了一个 println，以便我可以得到这个变量被检索时的反馈，以及何时被赋值，我在我的控制台上看到了这个：

我的控制台

我不认为堆栈跟踪在任何情况下都有用，但如果你想要的话，我可以粘贴堆栈跟踪后面的代码。

无论如何，如果你还没有注意到，这里有一个检索 life = 61，后面是一个检索 life = 70，完全没有将这个变量回归到 70 的任何赋值。

另外，我不知道这是否有用，但这是打印 "1 damaged 0, broadcasting to clients - Sent" 的代码：

它总结如下：

  • 减少玩家生命值
  • 如果玩家死亡，标记为死亡并进行其他小的效果处理
  • 发送事件到 Google Analytics
  • 在所有这些操作之后，如果游戏是服务器，则向所有客户端广播伤害事件
  1. public void takeDamage(float amount, Player owner, boolean showBlood, boolean local) {
  2.     if (local && KambojaMain.getInstance().multiplayerConnection && !KambojaMain.getInstance().isServer) return;
  3.     if (imunity <= 0) {
  4.         //new Exception().printStackTrace();
  5.         setLife(getLife() - amount * def);
  7.         if (owner != null) {
  8.             owner.score += amount * def;
  9.         }
  11.         if (showBlood)
  12.             state.showBlood(body.getWorldCenter());
  14.         System.out.println(" - DAMAGE DETECTED from " + owner.getId() + " to " + getId() + " with value " + amount + ", it was a local? " + local + ", and show blood is: " + showBlood);
  15.         System.out.println("target life is now at " + getLife());
  17.         hitTimer = 1f;
  18.         if (getLife() <= 0) {
  19.             if (!isDead()) {
  20.                 deaths++;
  21.                 if (owner != null) {
  22.                     owner.kills++;
  23.                     owner.ghosts.add(new Ghost(getId(), getPosition()));
  24.                     owner.score += 100;
  25.                 }
  26.                 setDead(true);
  27.                 body.getFixtureList().get(0).setSensor(true);
  28.                 getState().showSkull(body.getWorldCenter(), getAngle());
  30.                 String playerType = "controller";
  31.                 if (isKeyboard()) {
  32.                     playerType = "keyboard";
  33.                 }
  34.                 if (this instanceof BetterBot) {
  35.                     playerType = "bot";
  36.                 }
  38.                 HashMap<String, String> customs = new HashMap<String, String>();
  39.                 customs.put("cd1", KambojaMain.getMapName());
  40.                 customs.put("cd3", getWeapon().getClass().getSimpleName());
  41.                 customs.put("cd4", "player_" + playerType);
  43.                 String ow = "Suicide";
  45.                 if (owner != null)
  46.                     ow = owner.getWeapon().getClass().getSimpleName();
  48.                 KambojaMain.event("game", "player_kill", ow, customs);
  49.             }
  50.         }
  51.         if (gruntTimer < 0) {
  52.             if (GameState.SFX)
  53.                 grunt[(int) (Math.random() * 5)].play();
  54.             gruntTimer = 0.5f;
  55.         }
  57.         if (KambojaMain.getInstance().multiplayerConnection && KambojaMain.getInstance().isServer) {
  58.             KambojaPacket kp = new KambojaPacket(PacketType.PLAYER_DAMAGE);
  59.             PlayerDamage pd = new PlayerDamage();
  60.             pd.damage = amount;
  61.             pd.showBlood = showBlood;
  62.             pd.owner = owner.getId();
  63.             pd.target = getId();
  64.             kp.data = pd;
  65.             System.out.print(pd.owner + " damaged " + pd.target + ", broadcasting to clients - ");
  66.             KambojaMain.getInstance().broadcast(kp, Protocol.TCP);
  67.             System.out.println("Sent");
  68.         }
  69.     }
  70. }

注意：我正在使用多线程环境，因为这是一个局域网多人游戏，这个变量可以在不同于主线程的其他线程中检索。

我已经尝试过使用 volatile 关键字、原子类（没有 AtomicFloat，尝试使用 AtomicInt 实现它作为位数据），但这些都不能防止这种情况发生，我不知道这种行为是什么以及是什么原因导致的。

有人能帮帮我吗？我不知道还能搜索什么。

英文:

I don't event know how to describe this weird behaviour i'm dealing with right now, but the thing is:

I have a class Player.java that has a private float life, pretty basic.
this float has its setter / getter and there is NO other way of retrieving / attributing this variable without using the getter / setter.

also, i have put a println in each, so i can have a feedback of when this variable is being retrieved, and when is beign attributed, and i get THIS on my console:

my console

i don't think the stack trace is usefull in any way, but if you want to, i can paste the code behind the stack trace too

anyway, if you haven't notice, there is a retrieve of life = 61, FOLLOWED by a retriving of life = 70, with NO attribution WHATSOEVER of this variable back to 70.

also, i dont know if this is useful, but here is the code that prints the "1 damaged 0, broadcasting to clients - Sent":

it resume in:

  • decreases the player life
  • if it has died, mark as dead and do other little effect things
  • send event to google analytics
  • after all that, if the game is a server, broadcast the damage event to all clients
  1. 	public void takeDamage(float amount, Player owner, boolean showBlood, boolean local){
  2. 		if(local &amp;&amp; KambojaMain.getInstance().multiplayerConnection &amp;&amp; !KambojaMain.getInstance().isServer) return;
  3. 		if(imunity &lt;= 0){
  4. 			//new Exception().printStackTrace();
  5. 			setLife(getLife() - amount * def);
  6. 			
  7. 			if(owner != null) {
  8. 				owner.score += amount*def;
  9. 			}
  10. 						
  11. 			if(showBlood)
  12. 			state.showBlood(body.getWorldCenter());
  14. 			System.out.println(&quot; - DAMAGE DETECTED from &quot; + owner.getId() + &quot; to &quot; + getId() + &quot; with value &quot; + amount + &quot;, it was a local? &quot; + local + &quot;, and show blood is: &quot; + showBlood);
  15. 			System.out.println(&quot;target life is now at &quot; + getLife());
  16. 			
  17. 			hitTimer = 1f;
  18. 			if(getLife() &lt;= 0){
  19. 				if(!isDead()){
  20. 					deaths++;
  21. 					if(owner != null){
  22. 						owner.kills ++;
  23. 						owner.ghosts.add(new Ghost(getId(), getPosition()));
  24. 						owner.score += 100;
  25. 					}
  26. 					setDead(true);
  27. 					body.getFixtureList().get(0).setSensor(true);
  28. 					getState().showSkull(body.getWorldCenter(), getAngle());
  29. 					
  30. 					
  31. 					String playerType = &quot;controller&quot;;
  32. 					if(isKeyboard()) {
  33. 						playerType = &quot;keyboard&quot;;
  34. 					}
  35. 					if(this instanceof BetterBot) {
  36. 						playerType = &quot;bot&quot;;
  37. 					}
  38. 					
  39. 					HashMap&lt;String, String&gt; customs = new HashMap&lt;String, String&gt;();
  40. 					customs.put(&quot;cd1&quot;, KambojaMain.getMapName());
  41. 					customs.put(&quot;cd3&quot;, getWeapon().getClass().getSimpleName());
  42. 					customs.put(&quot;cd4&quot;, &quot;player_&quot; + playerType);
  43. 					
  44. 					String ow = &quot;Suicide&quot;;
  45. 					
  46. 					if(owner != null)
  47. 						ow = owner.getWeapon().getClass().getSimpleName();
  48. 					
  49. 					KambojaMain.event(&quot;game&quot;, &quot;player_kill&quot;,  ow, customs);
  50. 				}
  51. 			}
  52. 			if(gruntTimer &lt; 0){
  53. 				if(GameState.SFX)
  54. 				grunt[(int)(Math.random()*5)].play();
  55. 				gruntTimer = 0.5f;
  56. 			}
  57. 			
  58. 			if(KambojaMain.getInstance().multiplayerConnection &amp;&amp; KambojaMain.getInstance().isServer) {
  59. 				KambojaPacket kp = new KambojaPacket(PacketType.PLAYER_DAMAGE);
  60. 				PlayerDamage pd = new PlayerDamage();
  61. 				pd.damage = amount;
  62. 				pd.showBlood = showBlood;
  63. 				pd.owner = owner.getId();
  64. 				pd.target = getId();
  65. 				kp.data = pd;
  66. 				System.out.print(pd.owner + &quot; damaged &quot; + pd.target + &quot;, broadcasting to clients - &quot;);
  67. 				KambojaMain.getInstance().broadcast(kp, Protocol.TCP);
  68. 				System.out.println(&quot;Sent&quot;);
  69. 			}
  70. 		}
  71. 	}

note: i AM using multi threading environment because this is a lan multiplayer game, and this variable can be retrieved in other threads different from the main thread.

I have searched about the volatile keyword, Atomic classes (AtomicFloat dont exist, and the implementation of it using AtomicInt as a bit data also was used), but none of this could prevent this from happening and i have NO idea of what is this behaviour and what is causing it

can someone please help me? i don't know what to search anymore

答案1

得分: 0

尝试将你的方法设为synchronized（这将确保只有一个线程可以在类的实例上运行此方法）。

  1. public synchronized void takeDamage(.... // 与之前相同的代码

查看这篇帖子，其中有一个类似的问题，提供了有关以原子方式运行代码块的更多信息。

英文:

Try making your method synchronized (this would make sure only one thread can be running this method, on an instance of your class).

  1. public synchronized void takeDamage(.... // same as before

Check out this post, it has a similar question with more info about running blocks of code atomically.

huangapple
  • 本文由 发表于 2020年4月5日 08:30:33
  • 转载请务必保留本文链接：https://java.coder-hub.com/61036591.html
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