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POUpdate the Jtable at Runtime?
 

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    <p>I am trying to update a <code>JTable</code> when a users edit and enters new values into it, but I am getting casting error.</p> <p>Coding So Far:</p> <pre><code>import java.io.*; import java.awt.*; import java.util.*; import javax.swing.*; import java.awt.event.*; import javax.swing.table.*; public class Stackq extends AbstractTableModel { Vector data; Vector columns; public Stackq() { String line; data = new Vector(); columns = new Vector(); int count = 0; try { FileInputStream fis = new FileInputStream("D:/joy/text/registration.txt"); BufferedReader br = new BufferedReader(new InputStreamReader(fis)); StringTokenizer st1 = new StringTokenizer(br.readLine(), "\t"); while (st1.hasMoreTokens()) { columns.addElement(st1.nextToken()); count++; } while ((line = br.readLine()) != null) { StringTokenizer st2 = new StringTokenizer(line, "\t"); for (int i = 0; i &lt; count; i++) { if (st2.hasMoreTokens()) data.addElement(st2.nextToken()); else data.addElement(""); } } br.close(); } catch (Exception e) { e.printStackTrace(); } } public void setValueAt(Object value, int row, int col){ ((Vector) data.get(row)).setElementAt(value, col); fireTableCellUpdated(row,col); } public boolean isCellEditable(int row, int col){ //if (4 == col){ return true; } //else { // return false; // } //} public void insertData(Object[] values){ data.add(new Vector()); for(int i =0; i&lt;values.length; i++){ ((Vector) data.get(data.size()-1)).add(values[i]); } fireTableDataChanged(); } public void removeRow(int row){ data.removeElementAt(row); fireTableDataChanged(); } public int getRowCount() { return data.size() / getColumnCount(); } public int getColumnCount() { return columns.size(); } public Object getValueAt(int rowIndex, int columnIndex) { return (String) data.elementAt((rowIndex * getColumnCount()) + columnIndex); } public String getColumnName(int i){ return (String)columns.get(i); } public static void main(String s[]) { Stackq model = new Stackq(); JTable table = new JTable(); table.setModel(model); JScrollPane scrollpane = new JScrollPane(table); JPanel panel = new JPanel(); panel.add(scrollpane); JFrame frame = new JFrame(); frame.add(panel, "Center"); frame.pack(); frame.setVisible(true); } } </code></pre> <p>Error Message:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Vector at Stackq.setValueAt(Stackq.java:45) at javax.swing.JTable.setValueAt(JTable.java:2709) at javax.swing.JTable.editingStopped(JTable.java:4711) at javax.swing.AbstractCellEditor.fireEditingStopped(AbstractCellEditor.java:125) at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(DefaultCellEditor.java:350) at javax.swing.DefaultCellEditor.stopCellEditing(DefaultCellEditor.java:215) at javax.swing.JTable$GenericEditor.stopCellEditing(JTable.java:5465) at javax.swing.plaf.basic.BasicTableUI$Handler.mousePressed(BasicTableUI.java:980) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263) at java.awt.Component.processMouseEvent(Component.java:6260) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) </code></pre>
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    1. USAndrew Thompson
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    1. COthe same answer, read Oracle tutorial, Model_To_View with good describtion
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      1. USmKorbel
 

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