Thread: Alphabetical order

This is a program where the user types a bunch of words and then the program rearranges them into alphabetical order and then prints them.
But this code keeps crashing on line 35 at "for (int count = 0; count < word1.length() ; count++)". Could anyone tell me whats wrong? (You can only input words that has the same length)

The error it gives is : java.lang.StringIndexOutOfBoundsException
it only gives the error when the user doesnt type it in alphabetical order. IDK why

Here is the code:

import java.awt.*;
import hsa.Console;
 
public class Alphabeticall_order
{
    static Console c;           // The output console
    public static void main (String[] args)
    {
        c = new Console ();
        c.println ("How many words do you want to put in?");
        int slots = c.readInt ();
        String[] words = new String [slots];
        for (int y = 0 ; y < slots ; y++)
       {
            c.println ("Input the words with the same length");
            words [y] = c.readLine ();
       }
        for (int h = 0 ; h < slots ; h++)
        {
 
            for (int g = 0 ; g < slots - 1 ; g++)
            {
                words [g] = swaplow (words [g], words [g + 1]);
                words [g + 1] = swaphigh (words [g], words [g + 1]);
            }
 
        }
        for (int d = 0 ; d < slots ; d++)
            c.println (words [d]);
    }
 
 
    public static String swaplow (String word1, String word2)
    {
        String index = "";
        for (int count = 0; count < word1.length() ; count++)
        {
            if (word1.charAt(count) < word2.charAt(count))
            {
                index = word1;
                break;
            }
            else if (word1.charAt (count) > word2.charAt (count))
            {
                index = word2;
                break;
            }
        }
        return index;
    }
 
 
    public static String swaphigh (String word1, String word2)
    {
        String index = "";
        for (int count = 0; count < word1.length() ; count++)
        {
            if (word1.charAt (count) > word2.charAt (count))
            {
                index = word1;
                break;
            }
            else if (word1.charAt (count) < word2.charAt (count))
            {
                index = word2;
                break;
            }
        }
        return index;
    }
}

What exception or error is being thrown?

May I ask what the h variable is for. It's not doing anything. Or at least you never use it.

Also, in the h loop you're going from 0 to slots and in the other one, the inner one, you're going from 0 to slots - 1.

Unfortunately, I can't manage to import the Console class into JGrasp so it won't even compile for me.

Also, what happens if some of the characters happen to be the same

word1 = ostriches
word2 = penguins

Your code might leave index as null.

Funny, when I used Scanner, it compiled. No exceptions.

However, it is printing blanks for all the values in array. I think that might be due to index being null when characters happen to be the same.

   import java.awt.*;
   ;
 
   public class Alphabeticall_order
   {
      static java.util.Scanner console;           // The output console
      public static void main (String[] args)
      {
         console = new java.util.Scanner(System.in);
         System.out.println ("How many words do you want to put in?");
         int slots = console.nextInt ();
         String[] words = new String [slots];
         for (int y = 0 ; y < slots ; y++)
         {
            System.out.println ("Input the words with the same length");
            words [y] = console.nextLine ();
         }
         for (int h = 0 ; h < slots ; h++)
         {
 
            for (int g = 0 ; g < slots - 1 ; g++)
            {
               words [g] = swaplow (words [g], words [g + 1]);
               words [g + 1] = swaphigh (words [g], words [g + 1]);
            }
 
         }
         for (int d = 0 ; d < slots ; d++)
            System.out.println (words [d]);
      }
 
 
      public static String swaplow (String word1, String word2)
      {
         String index = "";
         for (int count = 0; count < word1.length() ; count++)
         {
            if (word1.charAt(count) < word2.charAt(count))
            {
               index = word1;
               break;
            }
            else if (word1.charAt (count) > word2.charAt (count))
            {
               index = word2;
               break;
            }
         }
         return index;
      }
 
 
      public static String swaphigh (String word1, String word2)
      {
         String index = "";
         for (int count = 0; count < word1.length() ; count++)
         {
            if (word1.charAt (count) > word2.charAt (count))
            {
               index = word1;
               break;
            }
            else if (word1.charAt (count) < word2.charAt (count))
            {
               index = word2;
               break;
            }
         }
         return index;
      }
   }

 

How many words do you want to put in?

9

Input the words with the same length

Input the words with the same length

mongoose

Input the words with the same length

penguins

Input the words with the same length

ostriches

Input the words with the same length

octopuses

Input the words with the same length

tarantula

Input the words with the same length

political

Input the words with the same length

warmonger

Input the words with the same length

Australia

it still gives exceptions

i figured it out: When you type this

words [g] = swaplow (words [g], words [g + 1]);
               words [g + 1] = swaphigh (words [g], words [g + 1]);

you have type this in its place:

String p = words [g];
                String q = words [g + 1];
                words [g] = swaplow (words [g], words [g + 1]);
                words [g + 1] = swaphigh (p, q);

It was not working because words[g + 1] would be equal to words[g] without a variable p to hold words[g] in the unswapped form