1 Reply Latest reply: Jun 10, 2012 7:19 PM by EJP RSS

    Can't convert an ArrayList into a Double

    942741
      I have this TXT file with some data that i read and insert it to an arraylist then i want to pass the data in to several variables but i keep getting an error when i convert it to double.

      TXT file:
      volvo
      200000
      0.7
      2000
      Mercedes
      500000
      1.0
      1000
      Fiat
      100000
      0.5
      5000

      Code:
      class Register{
      private ArrayList bilar = new ArrayList();
      private BufferedReader indata =     new BufferedReader(new InputStreamReader(System.in));

      //Read the information from .txt"
      public void läsInRegister() throws IOException{
      try
      {
      FileReader file = new FileReader("C:/Users/Kelly/workspace/cla…
      BufferedReader buf = new BufferedReader(file);
      String in = buf.readLine();

      while (in != null && !in.equals(""))
      {
      bilar.add(in);
      in = buf.readLine();
      }
      System.out.println(bilar+ "\n" );
      }
      catch (Exception e){
      }
      }

      public void set(){

      for(int i=0; i< bilar.size(); i++) {

      String str = bilar.get(i).toString();
      String modell = str;
      i=i++;
      str="";
      str = bilar.get(i).toString();
      // until here everything is allright

      // Now i have try with this ways but still nothing

      double inköpspris = Double.parseDouble(str);
      i=i++;
      double bränsleförbrukning = (double) bilar.get(i);
      i=i++;
      double underhåll = (double) bilar.get(i);
      i=i++;     
      double bränsleförbrukning = Double.parseDouble((String) bilar.get(i));
      }
      i can convert it to string there is no problem there, so i tried to convert the string str to double but still keeps getting the same error
      the error is:

      Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Double
      at examples.Register.sortera(Bilkostnad.jav…
      at examples.Bilkostnad.main(Bilkostnad.java…