Trying to Create an Array of Arrays

Question

I am working on a school project that requires me to sort 50 sets of integers of n size for 10 values of n. I have the sorting methods all worked out but what I can't figure out is how to package these monster arrays in order to loop them through the sorts.

My original thought was an array of two-dimensional arrays. I'm trying to stay away from ArrayList because I don't want to deal with the headache of downcasting integers. So my question is, is there a way to do something like:

private array[] fullList; //this is where I would store my 2-dimensional arrays
private int[n][50] sets; //this is where I would have my 50 sets of n length

Thoughts?

Okay, since I can't figure out to put it in the comments, this is what I came up with:

 public BenchmarkSorts(int[] sizes) {
        for (int i=0; i < sizes.length; i++){
           set = int[(sizes[i])][50]
              for (int row=0; row < sizes[i]; j++)
                 for (int column=0; column < 50; column++)
                    set[row][column] = rdm.nextInt();    
        fullList.add(i, set);
        }

I wish I could use the ArrayList sort but it is an Algorithm Design Class and I have to do it the hard way.

But, now it won't let me use sizes[i] in the second line to initate the value of the array set... any ideas?

You don't have to "deal with the headache of downcasting integers" with Java 1.5+ (which is very old at this point), which provides auto(un)boxing. — Matt Ball
– Matt Ball, Commented Feb 8, 2013 at 3:42
very true @MattBall. If we work with list or set family things will become easy. — Rais Alam
– Rais Alam, Commented Feb 8, 2013 at 3:45
ArrayLists are dynamic and pretty well optimized inside Java. So just stick to them when you need any kind of array functionality. They work well in most scenarios. — notthetup
– notthetup, Commented Feb 8, 2013 at 3:49

Lokesh · Accepted Answer · 2013-02-08 03:48:40Z

1

ArrayList would be much better choice. You can create generic arraylist of inetegers and that should do the job.

answered Feb 8, 2013 at 3:48

Lokesh

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AlexWien · Accepted Answer · 2013-02-08 03:52:14Z

1

you can sort int arrays using Arrays.sort()
ArrayList is more handy. But it needs at least 4 times the memory, but that is only important if your arrays are huge.

answered Feb 8, 2013 at 3:52

AlexWien

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