java index of 2 dimensional arrays

Question

Having problems using 2 dimensional arrays. I have something like this:

List<List<String>> pmValues = new ArrayList<List<String>>();
List<String> pmList = new ArrayList<String>();

I want to add values from pmValues based on the index of pmList if it is equal to another value (layerrate):

for (something) {
    String layerrate = Something;
    String value = Something;

    for (int aa = 0; aa < pmList.size(); aa++) {
        int abc = aa;
        String abc2 = pmList.get(aa);
        for (int bb = 0; bb < pmValues.size(); bb++) {
            if (layerRate.contentEquals(abc2)) {
                pmValues.add(bb, value);   --> it doesnt save??? error
            }
        }
    }
}

I need something like this, I ran the code but seems not working as I need to get the index of pmList to use it to save the values from pmValues in the same index as pmList.

pmList: A
pmValues (values): A1, A2, A3, A4
pmList: B
pmValues (values): B1, B2, B3, B4
pmList: C
pmValues (values): C1, C2, C3, C4

Anyone have any idea? ty

what is the point of List<List<String>>, if you want to map A to A1,A2.. then why not use Map<String, List<String>> — Jigar Joshi
– Jigar Joshi, Commented Jul 1, 2014 at 4:54

Elliott Frisch · Accepted Answer · 2014-07-01 04:56:41Z

2

If I follow your question you need to get the inner List,

pmValues.add(bb, value);

should be something like,

if (pmValues.get(aa) == null) {
  pmValues.set(aa, new ArrayList<String>());
}
pmValues.get(aa).add(bb, value);

answered Jul 1, 2014 at 4:56

Elliott Frisch

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