Databases
StackOverflow2013
Postsdbo
POAdding String and int values to Arraylist - Java
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAdding String and int values to Arraylist - Java
    primarykey
    data
    text
    <p>I'm having trouble adding both string and int values to an arraylist. I'm reading in data from a tsv file, [String String String int] format. It works fine when all tokens are Strings, but I need to have the int to do some calculations later on. </p> <p>When I try to use an int value it doesn't work. Should I try to add the int to the arraylist or parse afterwards?</p> <p>Thanks for any help!</p> <pre><code>public class PlaycountData { //declare variables public String userID; public String artistID; public String artistName; public int playcount; public PlaycountData(String userID, String artistID, String artistName, int playcount){ this.userID = userID; this.artistID= artistID; this.artistName= artistName; this.playcount= playcount; } // end constructor public PlaycountData(String[] rep) { this.userID = rep[0]; this.artistID = rep[1]; this.artistName = rep[2]; //this.playcount = rep[3]; } // getter methods public String getUserID(){ return userID; } public String getArtistID(){ return artistID; } public String getArtistName(){ return artistName; } public int getPlaycount(){ return playcount; } // setter methods public void setUserID(String userID){ this.userID = userID; } public void setArtistID(String artistID){ this.artistID = artistID; } public void setArtistName(String artistName){ this.artistName = artistName; } public void setPlaycount(int playcount){ this.playcount = playcount; } @Override public String toString(){ return userID + artistID + artistName + playcount; } } public class LastFm { static ArrayList&lt;PlaycountData&gt; playcountRecords; public static void main(String [ ] args) throws IOException{ playcountRecords = new ArrayList&lt;PlaycountData&gt;(); // create a new arraylist of type PlaycountData String fileName = "C:\\Users\\Siân\\Desktop\\sample2.tsv"; BufferedReader br = new BufferedReader(new FileReader(fileName)); // allows us to read contents of file String line; try{ while((line = br.readLine()) != null ){ // keep reading if there are more lines in the file String[] rep = line.split("\t"); // enter the split line into an array PlaycountData playrep = new PlaycountData(rep); // create new PlaycountData object playcountRecords.add(playrep); // add array to arraylist } }catch(IOException e){ System.err.println("An error has occurred" + e); System.exit(-1); } finally{ if(br != null) br.close(); // close the stream } for(PlaycountData pr: playcountRecords){ System.out.println(pr.getUserID() + " " + pr.getArtistID() + " " + pr.getArtistName() + " " + pr.getPlaycount()); } // outputs all the data int[] plays = new int[playcountRecords.size()]; // create an int array to hold the playcounts for(PlaycountData pr2: playcountRecords){ System.out.println(pr2.getPlaycount()); } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USuser2886192
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou should also post the error you get to it easier to answer your question.
      singulars
      1. POAdding String and int values to Arraylist - Java
      1. USAxel
    2. COWhat's the error?
      singulars
      1. POAdding String and int values to Arraylist - Java
      1. USCold
    3. COThanks, will do in future
      singulars
      1. POAdding String and int values to Arraylist - Java
      1. USuser2886192
 

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload