按浮点值对二维 Java 数组进行排序

Question

I've done a little java coding with some JSON values i get from the internet. I put the values into a string array, print it and look for the best (aka highest) score and it's "parent" data set. But finally it would be nice to have them sorted by this score automaticly.

The array looks like:

myArray[0][0] = "John"
myArray[0][1] = "20"       //(<- int to String)
myArray[0][2] = "21.356"   //(<- float to String)
myArray[1][0] = "Sarah"    //data
myArray[1][1] = "32"       //data
myArray[1][2] = "27.045"   //score to be sorted on

Also i thought about sorting the data-sets before putting them into the array, but as they come in plain text (by reading json values from a website), i have to make a connection of the values before sorting and this is the point, where i have to pick and put them by hand in the array at first.

Is there an efficient way to sort the array?

Answer 1

You can create a custom comparator if you want to sort strings using the value inside them(here score) like:

Arrays.sort(myarray, new Comparator<String>() {
        @Override
        public int compare(String o1, String o2) {
            return Integer.valueOf(o1).compareTo(Integer.valueOf(o2));
        }
    });

Additionally you can write another comparator to sort the 2d array using a particular column.

Answer 2

If I understand you correctly, you can make a stream from your array and then use something like that:

...
.sorted(Comparator.comparingDouble(Double::parseDouble))
...