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• Build is successful but I kept getting the 'Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1'

  I have 3 classes but I think the problems are occurring between the Main and the Roman Numerals class. . . would also include the class Variables as well. . .

  import java.util.Scanner;
  
  public class Main{
  
  public static void main (String[] args){
      System.out.println("Press 1 for RPS, 2 for Flowchart, 3 for Roman Numerals, 4 for Ascendant");
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          System.out.println("You have chosen and initialized 1!");
          System.out.println("\nAttempting to Connect to RPS Class\n");
          RPS JackEnPoy = new RPS();
          JackEnPoy.RockPaperScissors();
          }
          else if (sel.run.equals("2")){
          System.out.println("You have chosen and initialized 2!");
          System.out.println("\nAttempting to Connect to Flowchart Class\n");
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          else if (sel.run.equals("3")){
          System.out.println("You have chosen and initialized 3!");
          System.out.println("\nAttempting to Connect to RomanNumerals Class\n");
          RomanNumerals rn = new RomanNumerals();
          rn.Numeral();
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          else if (sel.run.equals("4")){
          System.out.println("You have chosen and initialized 4!");
          System.out.println("\nAttempting to Connect to Ascending Class\n");
          //Ascending aorder = new Ascending();
          //aorder.Ascendant();
  
          }
          }
      }
  }
  

  and the class variables for the other classes

  class Variables{
  
  String run;
  //RPS
  String guide;
  String RW = "Rock Smashes Scissors!";
  String PW = "Paper Covers Rock!";
  String SW = "Scissors Shreds Paper!";
  String T = "Impasse!";
  //Flowchart
  int x;
  int y;
  int z;
  boolean YN;
  }
  

  and this is the Roman Numerals that I've been currently trying to work on whilst the RPS(Rock Paper Scissors) class and Flowchart class worked fine

  import java.util.Scanner;
  import javax.swing.JOptionPane;
  public class RomanNumerals{
  
  public static void Numeral()
  {
  //Declarations
  String num = " ", roman = " ";
  char sen = num.charAt(0), hachi = num.charAt(1), jyu = num.charAt(2), ichi = num.charAt(3);
  int convert;
  
  //String from num to Integer
  convert = Integer.parseInt(num);
  num = JOptionPane.showInputDialog("Convert from Whole Numbers to Roman Numerals(Maximum:3000)");
  
  
  //'if' more than 3k then terminate 'else' attempt conversion
  if (convert > 3000)
  {
  //Invalid Message with WARNING_MESSAGE dialog
  JOptionPane.showMessageDialog (null, "Input had exceeded the maximum of 3000", "RomanNumerals3000", JOptionPane.WARNING_MESSAGE);
  }
  else
  {
  if (ichi == '1')//0001
  roman += "I";
  if (ichi == '2')//0002
  roman += "II";
  if (ichi == '3')//0003
  roman += "III";
  if (ichi == '4')//0004
  roman += "IV";
  if (ichi == '5')//0005
  roman += "V";
  if (ichi == '6')//0006
  roman += "VI";
  if (ichi == '7')//0007
  roman += "VII";
  if (ichi == '8')//0008
  roman += "VIII";
  if (ichi == '9')//0009
  roman += "IX";
      if (jyu == '1')//0010
      roman += "X";
      if (jyu == '2')//0020
      roman += "XX";
      if (jyu == '3')//0030
      roman += "XXX";
      if (jyu == '4')//0040
      roman += "XL";
      if (jyu == '5')//0050
      roman += "L";
      if (jyu == '6')//0060
      roman += "LX";
      if (jyu == '7')//0070
      roman += "LXX";
      if (jyu == '8')//0080
      roman += "LXXX";
      if (jyu == '9')//0090
      roman += "XC";
          if (hachi == '1')//0100
          roman += "C";
          if (hachi == '2')//0200
          roman += "CC";
          if (hachi == '3')//0300
          roman += "CCC";
          if (hachi == '4')//0400
          roman += "CD";
          if (hachi == '5')//0500
          roman += "D";
          if (hachi == '6')//0600
          roman += "DC";
          if (hachi == '7')//0700
          roman += "DCC";
          if (hachi == '8')//0800
          roman += "DCCC";
          if (hachi == '9')//0900
          roman += "CM";
                  if (sen == '1')//1000
                  roman += "M";
                  if (sen == '2')//2000
                  roman += "MM";
                  if (sen == '3')//3000
                  roman += "MMM";
  JOptionPane.showMessageDialog(null, "Whole Number Form = " + num + "\nRoman Numeral Form = " + roman, "Converted!!!", JOptionPane.INFORMATION_MESSAGE,null);
  }
  System.exit(0);
  }
  }
  

  and the output went on like this. .

  3
  You have chosen and initialized 3!
  
  Attempting to Connect to RomanNumerals Class
  
  Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1
      at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
      at java.base/java.lang.String.charAt(String.java:1512)
      at RomanNumerals.Numeral(RomanNumerals.java:9)
      at Main.main(Main.java:27)
  Command execution failed.```
  I'm still new here and can't figure out on why am I getting this error after initiating 3 as in the RomanNumerals class. . 
  
• Command execution time in Java

  Is there any way to know the execution time of the command? Making exec synchronous

  Runtime rt = Runtime.getRuntime();
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