How come i'm getting this error outofboundsException?

Question

I don't seem to be getting any other errors except this one: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 I looked it up and it says i'm trying to get a value that isn't in my array list. I'm not sure where I went wrong with this.

import java.util.*;
 class DebugNine1
{
 public static void main(String[] args)
 {
  Scanner input = new Scanner(System.in);
  String[][] books = new String[6][2]; 
  books[0][0] = "Ulysses";
  books[0][1] = "James Joyce";
  books[1][0] = "Lolita";
  books[1][1] = "Vladimir Nabokov";
  books[2][1] = "Huckleberry Finn";
  books[2][1] = "Mark Twain";
  books[3][0] = "Great Gatsby";
  books[3][2] = "F. Scott Fitzgerald";
  books[4][0] = "1984";
  books[4][1] = "George Orwell";
  books[5][5] = "Sound and the Fury";
  books[5][1] = "William Faulkner";

  String entry,
     shortEntry,
     message ="Enter the first three characters of a book title omitting \"A\" or \"The\" ";
  int num, x;
  boolean isFound = true;
  while(isFound)
  {
     System.out.println(message);
     entry = input.next();
     shortEntry = entry.substring(0,3);
     for(x = 0; x < books.length; ++x)
        if(books[x][0].startsWith(entry))
        {
           isFound = false;
           System.out.println(books[x][0] + " was written by " + books[x][1]);
           x = books.length;
        }
     if(isFound)
        System.out.println("Sorry - no such book in our database");
    }
 }
}

I never thought that a programming question would get a literary answer — Hovercraft Full Of Eels, Apr 12 '20 at 17:00
And after "F. Scott Fitzgerald", read also "Sound and the Fury". — Matteo NNZ, Apr 12 '20 at 17:00
Seriously though, time to learn to use your debugger. You'll need the skills moving forward. — Hovercraft Full Of Eels, Apr 12 '20 at 17:00
You seem to have a typo on the lines with Huckleberry Finn, F. Scott Fitzgerald, and Sound and the Fury — Sweeper, Apr 12 '20 at 17:01

Arvind Kumar Avinash · Answer 1 · 2020-04-12T17:21:33.493

The problem is in the following two lines:

books[3][2] = "F. Scott Fitzgerald";
...
books[5][5] = "Sound and the Fury";

Change them to

books[3][1] = "F. Scott Fitzgerald";
...
books[5][0] = "Sound and the Fury";

Note that your array has been declared as follows:

String[][] books = new String[6][2];

which means you can have only 0 or 1 as the index value for the second dimension.

In addition to the problems mentioned above, you should also consider changing the first of the following two lines otherwise you will have null at books[2][0]:

books[2][1] = "Huckleberry Finn";
books[2][1] = "Mark Twain";

Change it to

books[2][0] = "Huckleberry Finn";

How come i'm getting this error outofboundsException?

1 Answers1