Sorting based on sort of another array [duplicate]

Question

I have a String array list totalVals. Each entry in totalVals is a string name and a double loc which is joined into a single string before it was inserted into the array list like:

totalVals.add(name + "," + loc);

This is how I am given the data. I have separated the values into a string and double array as follows:

String[] temp;
String[] names = new String[totalVals.size()];
double[] locs = new double[totalVals.size()];

for (int i = 0; i < totalVals.size(); I++){
    temp = totalVals.get(i).splot(",");
    names[i] = temp[0];
    locs[i] = Double.parseDouble(temp[1]);
}

Now however, I want to sort the data and put it back into the array list before returning. I want the locs data to be in descending order, which I can do by using Arrays.sort(locs, Collections.reverseOrder());. But I don't know how to sort names so that the names are still associated with the same locations that they were originally.

Example of totalVals: {"Bahamas,32.2233","Zimbabwe,82.2443","India,56.2355","Australia,24.4363"}

Would be split into:

names = {"Bahamas","Zimbabwe","India","Australia"};
locs = {32.2233,82.2443,56.2355,24.4363};

Which would then be sorted to:

names = {"Zimbabwe","India","Bahamas","Australia"};
locs = {82.2443,56.2355,32.2233,24.4363};

So how would I then sort the two arrays such that the associations at index i in both arrays remain the same?

Answer 1

Instead of turning your array into two arrays, turn it into an ArrayList<Pair>

The Pair class is the following :

public class Pair {
    private String country;
    private int loc;

    public Pair(String country, int loc) {
        this.country = country;
        this.loc = loc;
    }

    // getters and setters here
}

And sort your arrays like this :

Collections.sort(array, Comparator.comparingInt(Pair::getLoc));

And then split your array into the two arrays.