'How to add items to a list of lists

I aim to print a list of lists containing entry and exit times in the 24 hour decimal format from the "AM"-"PM" String format input by the user as a String array like this: {6AM#8AM, 11AM#1PM, 7AM#8PM, 7AM#8AM, 10AM#12PM, 12PM#4PM, 1PM#4PM, 8AM#9AM}

I declared the individual lists inside the for loop and assigned them values inside the loop but got the following run time exception from my code: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

Kindly help me debug my code:

import java.util.*;

public class TimeSchedule
{  
  public static List<List<Integer>> Timein24hourFormat(String[] input1)
  {
    List<List<Integer>> scheduledTime = new ArrayList<List<Integer>>();
    int [] exitTime = new int[input1.length];
    int [] entryTime = new int[input1.length];
    for (int i=0;i<input1.length;i++)
    { 
      List<String> listOfStrings = new ArrayList<>();
      List<Integer> tempList = scheduledTime.get(i);
      String[] timeSlot = input1[i].split("#");
      for (int m=0;m<2;m++)
      {
        listOfStrings.add(timeSlot[m]);
        if (listOfStrings.contains("AM"))
        { 
          listOfStrings.remove("AM");
          tempList.add(Integer.parseInt(listOfStrings.get(m)));
        }
        if (listOfStrings.contains("PM") && timeSlot[m].contains("12"))
        {
          listOfStrings.remove("PM");
          tempList.add(Integer.parseInt(listOfStrings.get(m)));
        }
        if (listOfStrings.contains("PM") && !timeSlot[m].contains("12"))
        {
          listOfStrings.remove("PM");
          tempList.add((Integer.parseInt(listOfStrings.get(m))) + 12);
        }
      }
     }
    return scheduledTime;
   }

  public static void main (String[]args)
  { 
    Scanner input = new Scanner(System.in);
    int customersNumber = input.nextInt();
    input.nextLine();
    String [] entryExitTime = new String[customersNumber];
    for (int i=0;i<customersNumber;i++)
    {
      entryExitTime[i] = input.nextLine();
    }
    System.out.println(Timein24hourFormat(entryExitTime));
  }
 }
javalistarraylistcollections


Solution 1:[1]

public static List<List<Integer>> Timein24hourFormat(String[] input1)
  {
    List<List<Integer>> scheduledTime = new ArrayList<List<Integer>>();
    int [] exitTime = new int[input1.length];
    int [] entryTime = new int[input1.length];
    for (int i=0;i<input1.length;i++)
  { 
    List<String> listOfStrings = new ArrayList<>();
    List<Integer> tempList = scheduledTime.get(i);
    String[] timeSlot = input1[i].split("#");

scheduledTime is empty at this stage and that's why you can not retrieve value and you get IndexOutOfBoundsException

Sources

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Source: Stack Overflow

Solution Source
Solution 1

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