英文:
Running into java.lang.NullPointerException Here
问题
我对编程还比较新，至少在我目前尝试的层次上是这样。我一直在为一个2D格斗游戏引擎创建一个角色类，该类将持有一个BufferedImage数组列表，其中包含角色动画的帧。程序中的所有内容都可以正常编译和运行，但在以下代码中，我一直遇到NullPointerException错误：
public void addImage(String image) throws IOException
{
this.character.add(ImageIO.read(new File(image)));
}
我不太确定如何修复这个问题，因为我对Java的一般了解水平有限（我只上过一门高中课程，而且是由一位不怎么称职的老师教授），无法正确理解各种网站上关于如何解决这个问题的描述。是否有人可以简洁明了地描述如何解决这个问题？谢谢！
英文:
I am quite new to programming, at least on the level that I am currently attempting. I've been creating a character class for use in a 2D fighting game engine that will hold a BufferedImage arraylist of frames of character animation. Everything in the program compiles and runs fine, except that I keep running into a NullPointerException in the following code:
public void addImage(String image) throws IOException
{
this.character.add(ImageIO.read(new File(image)));
}
I am not sure exactly how to fix this, as my low level of general Java knowledge (I only have 1 2 semester high school class by a shoddy teacher under my belt) prevents me from correctly understanding the descriptions on how to fix the problem on various websites. Could somebody describe how to solve this in a clean and concise way? Thank you!
答案1
得分: 0
空指针异常是在您尝试传递一个具有空值的对象引用时抛出的。我会查看确保您传递的文件实际上是否被读取。尝试先进行分解，然后在功能正常后进行更多的 consilidating（整合）。也许将文件存储在一个变量中，然后再添加进去。如果有效果，就继续使用；如果仍然出现空值异常，就检查您的新文件。
英文:
NullPointerException is thrown when you try to pass an object ref that has a null value.. I would look to make sure the file you are passing it actually getting read.. try breaking it down then consolidating more after it is functional.. maybe store your file in a variable firs then add that.. if it works then go with it, if it doesn't and you still get the null, look to your new File
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