如何从文件中定义给定大小的数组？-Howtodefineanarraywithgivensizefromafile?

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UPDATE: According to your comment, I had misunderstood your needs.

更新：根据你的评论，我误解了你的需求。

If your problem is just the array declaration, then this should probably solve it.

如果您的问题只是数组声明，那么这应该可以解决它。

You may declare your 2D-array this way as a "global" array(*):

您可以将这种2D数组声明为“全局”数组（*）：

private MyClass[][] myArray;

This won't initialize it, but declare its type as a 2D-array of MyClass objects.

这不会初始化它，而是将其类型声明为MyClass对象的2D数组。

Then when you start reading the file and you've got the size:

然后，当你开始阅读文件，你已经有了大小：

int size = /* read the size from the file */;
myArray = new MyClass[size][size];

It is unclear what you want to achieve.

目前还不清楚你想要达到什么目标。

If you want to dynamically add elements to an array and you don't know its size at initialization time, I would suggest you use an ArrayList:

如果你想动态地向数组添加元素而你在初始化时不知道它的大小，我建议你使用一个ArrayList：

ArrayList list = new ArrayList<>();

To add an element:

要添加元素：

list.add(element);

To access element at index i:

要访问索引i处的元素：

SomeClassForYourData element = list.get(i);

To find the size of the structure:

要查找结构的大小：

int size = list.size();