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javaswingjtabletablemodelabstracttablemodel

Add/Remove more columns to a JTable from a custom AbstractTableModel

I have a vector with HashMap elements. I want to put it in a table and every HashTable value must be in column with HashTable key column-title. So elements with key "key1" must appear on table column with name "key1".

The problem is when I try to add/remove columns of table with setHash() function. I pass a String[] with more/fewer elements and when this function run the fireTableStructureChanged() java throws like crazy.

I don't understand where is the problem. Can you help me please?

The implementation of Table Model is here:

public class ResizableTableModel extends AbstractTableModel {
  protected DataSource src;
  protected String[] hash;

  //......................

  public void setHash(String[] hash) {
        this.hash = hash;
        fireTableStructureChanged();  // THROWS!
  }

  public ArrayList getData() { return src.getData(); }
  public int getColumnCount() { return hash.length; }
  public int getRowCount() { return getData() == null ? 0 : getData().size(); }
  public String getColumnName(int col) { return hash[col]; }
  public boolean isCellEditable(int row, int col) { return true; }
  public Object getValueAt(int row, int col) {
    try {
      return ((HashMap) getData().get(row)).get(hash[col]);
    } catch (Exception e) {
      return null;
    }
  }
  public void setValueAt(Object obj, int row, int col) {
    try {
      //...................
    } catch (Exception e) {}
    fireTableDataChanged();
  }
}
Solution