From Arrays to ArrayList

Question

I have the following methods that I wrote are array and boolean methods. I was wondering how, if possible, can I convert the array method into an ArrayList one.

public int[] letsMap(){

    int[] iArray = new int[maxBagSize + 1];

    int w;

    for(int i = 0; i < ourBags.size(); i++){
        w = ourBags.get(i).foo;
        iArray[w]++;
    }

    return iArray;

}

.

public boolean comp(SearchState search){
            boolean cool = false;

            if(search.unBaggedItems.equals(this.unBaggedItems)){
                int[] mine = letsMap();
                int[] theirs = search.letsMap();

                cool= true;

                for(int i = 0; i < maxBagSize; i++){
                    if(mine[i] != theirs[i]){
                        cool = false;
                        break;
                    }
                }
            }

            return cool;
        }

Converted the int[] to ArrayList<>() but got lost in terms of knowing what to do with iArray[w]++; — user3092043
– user3092043, Commented Dec 23, 2013 at 5:42
What exactly is this supposed to do? If any of your elements in ourBags meets or exceeds the length of the array, you'll get a runtime exception. Also, what does your method comp have to do with your question? — Makoto
– Makoto, Commented Dec 23, 2013 at 5:52

Kyle · Accepted Answer · 2013-12-23 05:58:13Z

1

For the first method:

public ArrayList<Integer> letsMap(){

    ArrayList<Integer> iArray = new ArrayList<>(maxBagSize + 1);

    int w;

    for(int i = 0; i < ourBags.size(); i++){
        w = ourBags.get(i).foo;
        iArray.set(w, iArray.get(w) + 1);
    }

    return iArray;

}

And for the second:

public boolean comp(SearchState search){
    boolean cool = false;

    if(search.unBaggedItems.equals(this.unBaggedItems)){
        ArrayList<Integer> mine = letsMap();
        ArrayList<Integer> theirs = search.letsMap();

        cool = true;

        for(int i = 0; i < maxBagSize; i++){
             if(mine.get(i).compareTo(theirs.get(i)) != 0){
                cool = false;
                break;
            }
        }
    }

    return cool;
}

answered Dec 23, 2013 at 5:58

Kyle

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