Question

File is like this:

name1   134.2
name2   456.7
name3   265.3
...
...

I read the text file and store in HashMap
after that I want to sort in order(by the highest value) but the problem is that because I sort the values in String, I cant compare it.
So..is there a way to put the values of textfile into hashmap in double or integer form?

import java.io.*;
import java.util.*;


class Test 
{
    public static void main(String[] args) throws FileNotFoundException {

Scanner scanner = new Scanner(new FileReader("score.txt"));

        HashMap<String, String> map = new HashMap<String, String>();

        while (scanner.hasNextLine()) {
            String[] columns = scanner.nextLine().split("\t\t");
            map.put(columns[0], columns[1]);
        }

        System.out.println(map);
    }
}

Answer 1

Yes, use HashMap<String,Double> and when putting in the values, convert them to double using Double.parseDouble().

(You can do the same with Float rather than Double, but using Double makes so much more sense usually).