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You need to post more code than one statement for that error message. It needs to show where i and j are defined.

Given a String "acbd" where do the letters go in the array?
When the array is finished, how are the letters taken out of the array to make the String?


would give the array:
ab
cd

would...

Too much. I'm asking what the decrypt method should do with the String: "acbd"? I was looking for some simple steps like the following:
1) create an array
2) get a new String from the array
...

What does the decrypt method do with the String passed to it? Given the String: "acbd", what steps should it do to decrypt the String?

Are you sure that is the way? Shouldn't it be top to bottom, left to right?
first a
then down to b
then right to c
then down to d

What are the steps the decrypt() method must do with the String it gets as an arg?

Does that mean the code is now working?

The input does not make sense. It looks like the contents of a 2 dim array. Shouldn't the input be a String?
What are the steps the decrypt method should do with the input String it receives?