java 如何初始化未知数组长度的多维数组
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How to initialize a multi-dimensional array of unknown array length
提问by Kumar Anil
I am getting problems when generating a multi-dimensional array with unknown size. How can I fix it?
生成大小未知的多维数组时遇到问题。我该如何解决？
回答by RMT
To generate a multi-dimensional array with unknown size is called a jagged array.
生成大小未知的多维数组称为锯齿数组。
For example:
例如：
String[][] array = new String[5][];
Java uses arrays of arrays for multi-dimensional arrays. I think you have to specify the first size. Otherwise, use list of lists.
Java 将数组的数组用于多维数组。我认为您必须指定第一个尺寸。否则，使用列表列表。
ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();
回答by Sunil Kumar Sahoo
Array is static. ArrayList is dynamic.
数组是静态的。ArrayList 是动态的。
Before creating an array you should be aware of the size of the array. To create a multidimensional array without knowing array size is not possible.
在创建数组之前，您应该了解数组的大小。在不知道数组大小的情况下创建多维数组是不可能的。
Better you have to use a nested ArrayListor nested Vector:
最好使用嵌套ArrayList或嵌套Vector：
ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();
回答by Haphazard
You can either use a List of Lists or just declare the array to as big as you expect it to ever get.
您可以使用列表列表，也可以将数组声明为您期望的大小。
