What am I doing wrong? (TreeMaps and ArrayLists)

[john kidwell]

My prompt is to use the text files:

Hakeem Olajuwon, soccer basketball
Carl Crawford,basketball baseball football
John Elway,football baseball
Dave Winfield,baseball football basketball
Jackie Robinson,football track
Babe Didrikson,golf basketball track
Jim Brown,football lacrosse
Deion Sanders,baseball football
Bo Jackson,baseball football
Jim Thorpe,track football baseball basketball

and

basketball,football
track,lacrosse
basketball,football,baseball
baseball,basketball
golf
golf,baseball
baseball,football

and get this output:

basketball,football: Jim Thorpe,Carl Crawford,Dave Winfield,  the names (Thorpe, Crawford, Winfield) may be in any order 
track,lacrosse:
basketball,football,baseball: Jim Thorpe,Carl Crawford,Dave Winfield,
baseball,basketball: Jim Thorpe,Carl Crawford,Dave Winfield,
golf: Babe Didrikson,
golf,baseball:
baseball,football: Jim Thorpe,John Elway,Carl Crawford,Deion Sanders,Bo Jackson,Dave Winfield,

But my output is coming out like this:

{Hakeem Olajuwon=[soccer, basketball, soccer, basketball], soccer basketball=[soccer, basketball, soccer, basketball]}Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
	at Sports.main(Sports.java:40)

What am I doing wrong??

Here's my code:

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

public class Sports
{
	public static void main(String args[]) throws Exception
	{
		BufferedReader athlete2sports = new BufferedReader (new FileReader ("athlete2sports.txt"));
		BufferedReader whoPlayed = new BufferedReader ( new FileReader ("whoPlayed.txt"));
		
		TreeMap <String, ArrayList<String>> name2Sport = new TreeMap<String, ArrayList<String>> ();
		
		
		while (athlete2sports.ready())
		{
			String athlete2sport = athlete2sports.readLine();
			String[] name = athlete2sport.split(",");
			String [] sports =	name[1].split(" ");
			
			ArrayList<String> updatableList = new ArrayList <String> ();
				for (int i = 0; i<sports.length; i++)
				{
					List <String> listOfSports = Arrays.asList(sports);
					updatableList.addAll(listOfSports);
				}
			
				for (int j = 0; j<sports.length; j++)
					name2Sport.put(name[j], updatableList);
			
			System.out.print(name2Sport);
			
		
			while (whoPlayed.ready())
			{
			String readLine = whoPlayed.readLine();
			String[] sport = readLine.split(","); 
			
				for (int i = 0; i<sport.length; i++)
				{					
					if (sport [i].equals(sports[i]))
					{
					System.out.print(Arrays.toString(sport));
									
						for (int j = 0; j<sport.length; j++)
						{
							System.out.print(name2Sport.get(name[i]) + ",");
						}
									
			 		} //close of if statement
							
				}	//close of for loop
				
			} //close of while loop
			
		} //close of outer while loop
		
	} // END MAIN
	
} // END CLASS

[Henry Wong]

john kidwell wrote:
But my output is coming out like this:

{Hakeem Olajuwon=[soccer, basketball, soccer, basketball], soccer basketball=[soccer, basketball, soccer, basketball]}Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
	at Sports.main(Sports.java:40)

What am I doing wrong??

The stacktrace is saying... in Sport.java, at line 40, is the main() method of the Sports class. At that line, an array is accessed using an index of 2. Unfortunately, the array doesn't have an index of 2, likely because the array is smaller in size.

You need to go to that line, and figure out why the array access is out of bounds -- either the array is created of the wrong size, or the index calculated is wrong.

Henry