Question

Problem 2. Write a program that reads in the file names.txt from

data\ on the flashdrive and counts all of the unique first names

in the file. Find the name that occurs the most.

a. Note: you will want to import the filename as args[0] to avoid hardcoding the filename.

If you have the exact number of elements in your array as your data (read it in a method) returning the Array.

then you can use Arrays.sort(myArray) to sort the array. You will need to import java.util.

Once it is sorted, this problem is trivial.

Arrays.sort(myArray,0,size)

call this one ....UniqueNames

Answer 1

Answer:-

The below is the required source code for the given problem in Java

Code:-

public class FirstNAmes {
    public static void main(String[] args) throws Exception{
        Scanner sc = new Scanner(new File(args[0]));
        HashMap<String, Integer> map = new HashMap<>();
        String name = "";

        while(sc.hasNextLine()){
            name = sc.nextLine().split(" ")[0];
            if(map.containsKey(name)){
                map.put(name, map.get(name)+1);
            }
            else{
                map.put(name,1);
            }
        }

        int max = 0;
        String names[] = new String[map.size()];
        int i=0;
        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            names[i] = entry.getKey();
            i++;
            if (map.get(entry.getKey()) > max) {
                max = map.get(entry.getKey());
            }
        }

        for(Map.Entry<String, Integer> entry : map.entrySet()){
            if (map.get(entry.getKey()) == max) {
                System.out.println("Most frequent first name: "+entry.getKey());
                break;
            }
        }

        Arrays.sort(names, 0, map.size());
        for(int j=0; j<names.length; j++){
            System.out.println(names[j]);
        }

        sc.close();
    }
}

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