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Thread: xml read to table problem in getValueAt

  1. #1
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    Default xml read to table problem in getValueAt

    I am posting what I think is relevant code.
    In table class I have :

    class Table extends AbstractTableModel {
       private List<String> columnHeaders;
       private List<Object> tableData;
       public Table(SortedSet<String> oznake, List<Object> aRows) {
          columnHeaders= new ArrayList<String>(oznake);
          tableData= new ArrayList<Object>(aRows);
          System.out.println("       tableData:" + tableData.size() + " "+ tableData);
       }
     
       public int getColumnCount() {
          return columnHeaders.size();
       }
       public int getRowCount() {
          return tableData.size();
       }
     
       public Object getValueAt(int row, int column) {
          List rowData = (List)(tableData.get(row));
          return (String)rowData.get(column);
       }
     
       public String getColumnName(int column) {
          return (String)(columnHeaders.get(column));
       }
    }

    In XmlRead I have:

    public class XmlRead {
       public List<Object> getTable() {
          Map<String, String> rowMap = new LinkedHashMap<>();
          List<Object> aRows = new ArrayList<>();
                      rowMap.put(sOznaka, parser.getText());
                      aRows.add(Arrays.toString(rowMap.values().toArray(new String[rowMap.size()])));
          return (List<Object>)aRows;
       }
    }

    I get from table class:

    tableData:3 [[2007-01-01, 27.485, 156.93, 0, 1.3170], [2019-05-06, 25.715, 0, 124.13, 1.1199], [2019-05-09, 25.718, 122.91, 0, 1.1193]]
     
    Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: class java.lang.String cannot be cast to class java.util.List (java.lang.String and java.util.List are in module java.base of loader 'bootstrap')
     
    	at irose.IroseTable.getValueAt(IroseTable.java:71)

    It looks as the problem is the line:

    List rowData = (List)(tableData.get(row));

    I can not figure it out why. How can I cast String to List or should I do something else?

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: xml read to table problem in getValueAt

    How can I cast String to List
    You can't. You can build a list with the desired String in it.

    What is in the String? Can it be split and the results be placed in the list?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: xml read to table problem in getValueAt

    I thought I can not, thanks. I also think I already build a list with the desired string. That is this, in the [[:
    tableData:3 [[2007-01-01, 27.485, 156.93, 0, 1.3170], [2019-05-06, 25.715, 0, 124.13, 1.1199], [2019-05-09, 25.718, 122.91, 0, 1.1193]]

    That output is in the String in the List. How can I split it in to 15 parts, not three?

    I tried next:

       public Object getValueAt(int row, int col) {
          for(List<Object> td : (List)tableData) {
             for(int i=1;  i < tableData.size();  i++) {
                List string = (List)tableData.get(i);
                String string = (String)tableData.get(i);
                return tableData.get(i);
             }
          }
       }


    but it gave me :
    src/irose/IroseTable.java:48: error: incompatible types: Object cannot be converted to List<Object>
          for(List<Object> td : (List)tableData) {
                                ^

  4. #4
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    Default Re: xml read to table problem in getValueAt

    in the [[:
    That looks like the enclosing brackets for a 2 dim array. The print out looks like there are 3 rows with each row having 5 columns.
    If you want to put those 15 elements into a list, there will need to be code to handle the rows and columns.
    First split the 3 rows and then for data for each row split out the 5 columns.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: xml read to table problem in getValueAt

    Quote Originally Posted by Norm View Post
    First split the 3 rows and then for data for each row split out the 5 columns.
    To do that, i guess I have to solve the problem with: "incompatible types: Object cannot be converted to List<Object>". How do I solve this?
    Last edited by solomon73; June 3rd, 2019 at 02:57 AM.

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    Default Re: xml read to table problem in getValueAt

    How do I solve this?
    Do the conversion yourself instead of using a cast.
    Write a method that takes whatever type the data is in the Object as input and returns a List.
    To see the datatype, call getClass() on the Object.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: xml read to table problem in getValueAt

    How do I do that?

  8. #8
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    Default Re: xml read to table problem in getValueAt

    How do I do that?
       System.out.println(tableData.getClass());  // show object's class

    When you know the object's class, you can write the code to extract the parts you want to put in the list.
    private List<theDataType> getList(Object tableData) {
        // create list from tableData and return it
       return createdList;
    }
    If you don't understand my answer, don't ignore it, ask a question.

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