How to initialize a multi-dimensional array of unknown array length

I am getting problems when generating a multi-开发者_如何转开发dimensional array with unknown size. How can I fix it?

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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>>();

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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>>();