reading from a text file and store it into an array JAVA

Question

Hello guys!

I'm new in JAVA programming and I have a problem.

I have a text file with multiple lines (a line looks like this "sugar;23;45") and I want to extract the numbers from each line make a sum with column 2 + column 3 and then store each result in an array.

The output should look as a table.

How could I do this? Can anyone help me?

Answer 1

Try this:

import java.io.*;

import java.util.*;

public class Catalin

{

   public static void main(String[] args)

   {

       ArrayList<Integer> sumsList = new ArrayList<Integer>();

       try

       {

          BufferedReader br = new BufferedReader(new FileReader("catalin.txt"));

          String line;

          while ((line = br.readLine()) != null) 

          {

             String[] items = line.split(";");

             int number = Integer.parseInt(items[1]);

             int number2 = Integer.parseInt(items[2]);

             sumsList.add(number + number2);

          }

          br.close();

       }

       catch(IOException e)

       {

          System.out.println("I/O Error : " + e);

       }

       

       // convert ArrayList<Integer> to int[]

       int[] sumsArray = new int[sumsList.size()];

       for(int i = 0; i < sumsArray.length; i++) sumsArray[i] = sumsList.get(i);

       System.out.println("Line Sum");

       System.out.println("---- ---");

       for(int i = 0; i < sumsArray.length; i++)

       { 

          System.out.println((i + 1) + "     " + sumsArray[i]);

       }

   }

}