StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POReading CSV file without third-party libraries
primarykey
Id
13384156
data
AcceptedAnswerId
13384270
AnswerCount
2
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2012-11-14T17:37:38.533
FavoriteCount
0
LastActivityDate
2012-11-14T18:03:33.120
LastEditDate
2012-11-14T17:48:13.717
LastEditorUserId
545127
OwnerUserId
1815411
ParentId
0
PostTypeId
1
Score
0
ViewCount
1290
LastEditorDisplayName
text
Body
<p>I'm trying to read a csv file into either an ArrayList or a String [][] array. In this I'm trying to read it into a list and then form the list, using a tokenizer, into an array. The csv file have 7 columns (A - G) and 961 rows (1-961). My for loop for the 2D array keeps returning a null pointer, but I think it should be working..</p> <pre><code>public class FoodFacts { private static BufferedReader textIn; private static BufferedReader foodFacts; static int numberOfLines = 0; static String [][] foodArray; public static String aFact; static int NUM_COL = 7; static int NUM_ROW = 961; // Make a random number to pull a line static Random r = new Random(); public static void main(String[] args) { try { textIn = new BufferedReader(new InputStreamReader(System.in)); foodFacts= new BufferedReader(new FileReader("foodfacts.csv")); Scanner factFile = new Scanner(foodFacts); List<String> facts = new ArrayList<String>(); String fact; System.out.println("Please type in the food you wish to know about."); String request = textIn.readLine(); while ( factFile.hasNextLine()){ fact = factFile.nextLine(); StringTokenizer st2 = new StringTokenizer(fact, ","); //facts.add(fact); numberOfLines++; while (st2.hasMoreElements()){ for ( int j = 0; j < NUM_COL ; j++) { for (int i = 0; i < NUM_ROW ; i++){ foodArray [j][i]= st2.nextToken(); //NULL POINTER HERE System.out.println(foodArray[j][i]); } } } } } catch (IOException e) { System.out.println ("Error, problem reading text file!"); e.printStackTrace(); } } } </code></pre>
Tags
<java><csv><arraylist><stringtokenizer>
Title
Reading CSV file without third-party libraries
singulars
PostAcceptedAnswerId
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USRaedwald
UserOwnerUserId
1. USFred V
plurals
PostLinksPostIdRelatedPostId
1. PL
  singulars
  LinkTypeLinkTypeId
  LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
  singulars
  PostTypePostTypeId
  PTAnswer
2. PO
  singulars
  PostTypePostTypeId
  PTAnswer
VotesPostIdCreationDate
1. VO
  singulars
  PostPostId
  POReading CSV file without third-party libraries
  UserUserId
  This table or related slice is empty.
  VoteTypeVoteTypeId
  VTUndeletion
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.