Question

I am studying Java and sorting.

I have a question about tracking the index number for duplicate values.

For example, we have table and I put all data into the ArrayList, like this:

ArrayList = {FOO , AA, BOB, AA, BOB}

Index | Value
1     |  FOO
2     |  AA
3     |  BOB
4     |  AA
5     |  BOB

Now I would like to sort the data:

Index | Value
2     | AA
4     | AA
3     | BOB
5     | BOB
1     | FOO

Is there any way to keep unique index and sort data?

Thanks.

Answer 1

Create a class

class DataHelper{
  private String name;
  private int index;
  // other stuff
}

and create List<DataHelper> and write a Comparator to sort DataHelpers