I am getting problems when generating a multi-dimensional array with unknown size. How can I fix it?
['https://Stackoverflow.com/questions/6176627', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/737369/']
To generate a multi-dimensional array with unknown size is called a jagged array.

For example:

```
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.

```
ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();

```
Array is static. ArrayList is dynamic.

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.

Better you have to use a nested `ArrayList` or nested `Vector`:

```
ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();

```