Sort 2D Java array by float value

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?

There are many sorting algorithms and each one serves the purpose by sorting each element. You just need to do some research what suits your requirement. Not sure what exactly your question is. — Ravi
– Ravi, Commented Apr 22, 2020 at 13:24
I've searched a while, but most algorithms aim on lists or 1D arrays. Others i saw aim on 2D arrays, but are only applicatable on [x][2]-arrays with exactly 2 Values (data and value to be compared). So as i tried to adapt this algorithm i failed after a few hours — renegade2k
– renegade2k, Commented Apr 22, 2020 at 13:27
stackoverflow.com/questions/15452429/java-arrays-sort-2d-array — PastorPL
– PastorPL, Commented Apr 22, 2020 at 13:29
I suggest using a different data structure than a 2-D array. I would create a class that contains members for the name, age and score. From the JSON, I would create instances of my class and add those instances to a list. I think it would be easier to sort the list than it is to sort a 2-D array. — Abra
– Abra, Commented Apr 22, 2020 at 13:38

fuzious · Accepted Answer · 2020-04-22 13:26:36Z

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.

answered Apr 22, 2020 at 13:26

fuzious

4101 gold badge6 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Someone Else · Accepted Answer · 2020-04-22 13:31:45Z

0

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

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

answered Apr 22, 2020 at 13:31

Someone Else

132 bronze badges

Collectives™ on Stack Overflow

Sort 2D Java array by float value

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related