Question

This is my program it reads from a file but I was away for the lecture for file readers so I’m winging it.
This program currently reads in one line and prints out the top 3 values from it but it only works with one line in the file.

import java.util.*;
import java.io.*;
public class ProcessdatdereFile
{
    public static void main (String[] args)throws IOException{
        List namenum=readM("data/raw.txt");
        dataProcess(namenum);
    }

    public static List readM(String filename)throws IOException{
        Scanner fr=new Scanner(new FileReader(filename));
        List<String>namenum=new ArrayList<String>();
        while(fr.hasNext()){
            namenum.add(fr.next());
        }
        fr.close();
        Collections.sort(namenum,Collections.reverseOrder());
        return namenum;
    }

    public static void dataProcess(List namenum)throws IOException{
        for(int i=0;i<4;i++){
            System.out.printf("%s ",namenum.get(i));
        }
        System.out.println("");
    }
}

raw.txt contains

Mary 45 87 23 76
Joe 34 76 12 78 34 87
Anne 90 5 99

The program needs to print each name and the top 3 scores on individual lines.
Lengthy replies are welcome.
Thanks in advance.

Answer 1

public static void main (String[] args)throws IOException{
    String filename = "data/raw.txt";
    Scanner fr=new Scanner(new FileReader(filename));
    //reads the line and passes it to another method where it is put into a list
    String line;
    while(fr.hasNextLine()){
        line=fr.nextLine();
        List namenum=readM(line);
        dataProcess(namenum);
    }
    fr.close();        
}

public static List readM(String line)throws IOException{
    Scanner scn=new Scanner(line);
    List<String>namenum=new ArrayList<String>();
    while(scn.hasNext()){
        namenum.add(scn.next());
    }
    Collections.sort(namenum,Collections.reverseOrder());
    return namenum;
}

Ive changed these two methods so that it processes them as a line each rather than each string in the file. It now takes each Line and prints it out with the name and 3 top scores.