Day 3

import java.io.*;
import java.util.*;

class Day3part1
{
    public static void main(String args[]) throws Exception
    {
        File file = new File("PATH TO THE TXT");

        Scanner scanner = new Scanner(file);

        String string1 = scanner.nextLine();
        String string2 = scanner.nextLine();

        ArrayList<String> list1 = new ArrayList<String>(Arrays.asList(string1.split(",")));
        ArrayList<String> list2 = new ArrayList<String>(Arrays.asList(string2.split(",")));

        scanner.close();

        Wire one = new Wire(0, 0);
        Wire two = new Wire(0, 0);

        for (int j = 0; j < list2.size() / 10; j++)
        {

            for (int i = 0; i < list1.size() / 10; i++) {
                if (one.xCoord == two.xCoord && one.yCoord == two.yCoord)
                {
                    System.out.println("INTERSECTION AT (" + one.xCoord + ", " + one.yCoord + ")");
                }

                if (list1.get(i).contains("U0") || list1.get(i).contains("R0") || list1.get(i).contains("D0")
                        || list1.get(i).contains("L0"))
                {
                    continue;
                }

                if (list1.get(i).contains("U"))
                {
                    one.xCoord += 1;
                    list1.set(i, "U" + Integer.toString(Integer.parseInt(list1.get(i).substring(1, list1.get(i).length())) - 1));
                    i--;
                }

                else if (list1.get(i).contains("R"))
                {
                    one.yCoord += 1;
                    list1.set(i, "R" + Integer.toString(Integer.parseInt(list1.get(i).substring(1, list1.get(i).length())) - 1));
                    i--;
                }

                else if (list1.get(i).contains("D"))
                {
                    one.xCoord -= 1;
                    list1.set(i, "D" + Integer.toString(Integer.parseInt(list1.get(i).substring(1, list1.get(i).length())) - 1));
                    i--;
                }

                else if (list1.get(i).contains("L"))
                {
                    one.yCoord -= 1;
                    list1.set(i, "L" + Integer.toString(Integer.parseInt(list1.get(i).substring(1, list1.get(i).length())) - 1));
                    i--;
                }
            }

            if (list2.get(j).contains("U0") || list2.get(j).contains("R0") || list2.get(j).contains("D0")
                    || list2.get(j).contains("L0"))
                    {
                continue;
            }

            if (list2.get(j).contains("U"))
            {
                two.xCoord += 1;
                list2.set(j, "U" + Integer.toString(Integer.parseInt(list2.get(j).substring(1, list2.get(j).length())) - 1));
                j--;
            }

            if (list2.get(j).contains("R"))
            {
                two.yCoord += 1;
                list2.set(j, "R" + Integer.toString(Integer.parseInt(list2.get(j).substring(1, list2.get(j).length())) - 1));
                j--;
            }

            if (list2.get(j).contains("D"))
            {
                two.xCoord -= 1;
                list2.set(j, "D" + Integer.toString(Integer.parseInt(list2.get(j).substring(1, list2.get(j).length())) - 1));
                j--;
            }

            if (list2.get(j).contains("L"))
            {
                two.yCoord -= 1;
                list2.set(j, "L" + Integer.toString(Integer.parseInt(list2.get(j).substring(1, list2.get(j).length())) - 1));
                j--;
            }
        }
    }
}




OTHER FILE:

public class Wire
{
    int xCoord;
    int yCoord;

    Wire(int xCoord, int yCoord)
    {
        this.xCoord = xCoord;
        this.yCoord = yCoord;
    }
}