storing an integer array into a list integer array and accessing those variables in order

Question

okay so i have this code and i would like to store the values of an array of integers intwholef[x] and store those values in the array wholelist[y]. the only problem is that the way i have it set up is that im taking the first three values of the array and storing them in intwholef[x] and then x is resetting as it passes on the the next line. a graphical representation is below

This is the contents of the file stored in an array of strings

intwholef[0] = 1 3 10
intwholef[1] = 2 4 15
intwholef[2] = 3 6 8
intwholef[3] = 4 7 3
intwholef[4] = 5 9 12

now what i WANT is those values to be stored like this.

wholelist[] = 1,3,10,2,4,15,3,6,8,4,7,3,5,9,12

and be accessible like

wholelist[2] * wholelist[5] = 150;

the problem that im running into is that im not able to save the values in a list like this, any ideas?

here is the whole code, the part im talking about is at the bottom

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class project1
{
    @SuppressWarnings("null")
    public static void main(String[] args)
    {
        System.out.println("These are your following choices: ");
        System.out.println("1. First-Come First-Served (FCFS): ");
        System.out.println("2. Shortest Job Next (SJN): ");
        System.out.println("3. Shortest Remaining Time (SRT): ");
        System.out.println("4. Round Robin (RR) with time quantum = 4 ms: ");
        System.out.println("please enter your choice by entering 1, 2, 3, 4");
        Scanner in = new Scanner(System.in);
        int choice = in.nextInt();
        if(choice ==1)
        {
            System.out.println("your choice was first come first serve");
        }
        else if(choice == 2)
        {
            System.out.println("your choice was shortest job next");
        }
        else if(choice == 3)
        {
            System.out.println("your choice was shortest job remaining");
        }
        else if(choice == 4)
        {
            System.out.println("your choice was round robin (rr) with time quantum = 4 ms");
        }
        else
        {
            System.out.println("you entered an invalid choice");
        }
        BufferedReader file = null;

        System.out.println("Please enter the file path for your input");
        Scanner fp = new Scanner(System.in);
        String input = fp.nextLine();
        String fileloc;
        String[] wholef = null;
        int fline = 0;
        try 
        {
            file = new BufferedReader(new FileReader(input));
            fileloc = file.readLine();
            fline = Integer.parseInt(fileloc);  // this stands for file contents from the file to be read
            wholef = new String[fline];
            int i = 0;
            while((fileloc = file.readLine()) != null)
            {
                wholef[i] = fileloc;
                System.out.print("the contents of this file are: ");
                System.out.println(fileloc);
                i++;
            }
        System.out.println("This is the contents of the file stored in an array of strings");
        for(int n = 0; n < fline; n++)
        {
            System.out.println(wholef[n]);
        }
        } catch (IOException er)
        {
            er.printStackTrace();
        }
        finally
        {
        try
        {
            if(file != null)
            {
                file.close();
            }
        } catch(IOException erx)
        {
            erx.printStackTrace();
        }
        }

        System.out.println("This is the size of the contents of the file");
        for(int n = 0; n < fline; n++)
        {
            System.out.println(wholef[n].length());
        }

        System.out.println("this is the input file converted and stored into an array of integers");

        String[] parts = null;
        int[] intwholef = null;
        int[] wholelist =null;
        for(int x = 0; x < fline; x++)
        {
            parts = wholef[x].split(" ");

            intwholef= new int[parts.length];

            for(int n = 0; n < parts.length; n++)
            {
                intwholef[n] = Integer.parseInt(parts[n]);
                System.out.println(/*"intwholef[" + n + "] = " + */intwholef[n]);
                for(int m = 0; m < parts.length; m++)
                {
                    //wholelist[m]= intwholef[n];
                }
            }
        }

        System.out.println("this is the list of number from the conversion dumped into a singular array list");

        for(int i = 0; i < 15; i++)
        {
            System.out.println("intwholef[" + i + "] = " + wholelist[i]);
        }
        /*
        System.out.println("operations done with array of ints");
        for(int i = 0; i < 20; i++)
        {
            System.out.println(intwholef[i]);
        }
        //System.out.println(intwholef[0] * intwholef[3]);
        */

    }
}

ddmps · Accepted Answer · 2013-03-07 23:18:48Z

2

I suggest you use a List (like ArrayList) instead of an array as the size of it can change. As such:

ArrayList wholeList = new ArrayList<Integer>();
for(int x = 0; x < fline; x++)
    {
        parts = wholef[x].split(" ");
        for(int n = 0; n < parts.length; n++)
        {
            wholeList.add(Integer.parseInt(parts[n]));
        }
    }

Then you can access the different values with wholeList.get(index).

answered Mar 7, 2013 at 23:18

ddmps

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2 Comments

user1721540 Over a year ago

okay this worked but when i tried to print them out, it gave me an error, is used System.out.println(wholelist.get(i)); in a for loop incrementing the variable i. if thats not how you access them then how would i go about doing so?

user1721540 Over a year ago

never mind i see that i was making the error in another location, thank you again this helped immensely!

user000001 · Accepted Answer · 2013-03-07 23:21:57Z

0

You can do it simply using an ArrayList. If you want to end up with an Array, use the toString method. Split the string with \\s, so that any whitespace can serve as delimiter. Also, you only need only loop, like this:

    int[] myArray = new int[10];
    List<Integer> list = new ArrayList<Integer>();
    while ((fileloc = file.readLine()) != null) {
        for (String s : fileloc.split("\\s+")) {
            list.add(Integer.parseInt(s));
        }
        System.out.println(Arrays.toString(myArray));
    }
    int[] wholelist = list.toArray();

answered Mar 7, 2013 at 23:21

user000001

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