CODEWITHSUNDEEP
javaarraysobject
Jay Lingenfelter
Jay Lingenfelter

Reputation: 1

Is there a way to use a Scanner to build a set of objects from reading a file?

I was wondering if there was a way to have a scanner read through a file in java and compile it into an object of an arraylist, for example if the file being read is in the same basic format of a workers attributes in the file being; Name, Payrate(float), skills 1(float), skills 2(float), then have it repeat again after a new worker is introduced. Such as;

file "workers.txt":

Bob Overflow Full-time 12.50 phr Painting .45 carving .85

Susan Nasus part-time 7.50 phr painting .80 carving .25

then compile it to be worker 1, worker 2, worker 3 ect with the given attributes into an array. 

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class RaceCarOne
{
        public static void main(String args[]) throws FileNotFoundException 
        {
            //creating File instance to reference text file in Java
            File text = new File("C:\\Users\\jayli\\Desktop\\Workers.txt");
            //Creating Scanner instance to read File in Java
            Scanner s = new Scanner(text);
            //Reading each line of file using Scanner class
            int lineNumber = 1;
            while(s.hasNextLine())
            {
                String line = s.nextLine();
                System.out.println("line " + lineNumber + " :" + line);
                lineNumber++;
            }          
            s.close();  
        }   
}

class Worker 
{
    File text = new File("C:\\Users\\jayli\\Desktop\\Workers.txt");

    Scanner s = new Scanner(text);

    String Name;
    int WorkHours;
    int Fab;
    int Serv;
    int Diag;
    int Trans;
    int Intake;
    int BW;
    int Paint;
    boolean working = false;

    Worker(String workername, float pay, float Fab, float Serv, float Diag, float Trans, float Intake, float BW, float Paint)
    {
        while(s.hasNextLine())
        {

        workername = s.nextLine();
        pay = s.nextInt();
        Fab = s.nextInt();
        Serv = s.nextInt();
        Diag = s.nextInt();
        Trans = s.nextInt();
        Intake = s.nextInt();
        BW = s.nextInt();
        Paint = s.nextInt();
        }
    }
}

Upvotes: 0

Views: 38

Answers (1)

Dennis B.
Dennis B.

Reputation: 118

I suggest using the s.nextline() to get a line, and then split it according to your wishes. You could use a regex pattern for this which you can test with Regexr for example. Alternatively you can use the split()-Method and split by spaces. However, as this invokes other problems (e.g. skills with spaces in their name), I agree with Sweeper in that you should probably use something like JSON for your input.

Additionally, I think your constructor for Worker just loops through the whole file and you end up with the info on the last line everytime.

Upvotes: 1

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