Netbeans Jtable

[Manfizy]

Hi people,
I have created a table and populated it with some data using netbeans.I want to do some calculations on the data but i dont know how to get the data from the table.Anyone with an idea on how to solve this problem?
Thanks in advance

[Eranga]

Simply use getValueAt() method with the correct row/column index. It's return an Object, you have to cast into the correct type you want.

[Manfizy]

Simply use getValueAt() method with the correct row/column index. It's return an Object, you have to cast into the correct type you want.

Hi,thank you for your reply.I have tried using getValueAt() method but still i cant see the output.Could you please write an example code that gets some values from a table and displays it may be in a text area.
Thank you in advance

[Eranga]

    public void GetTableValues() {
        String str = (String) jTable1.getValueAt(1, 0);
        JOptionPane.showMessageDialog(null, str);
    }

Can you show your code here to see what you have done?

[Manfizy]

    public void GetTableValues() {
        String str = (String) jTable1.getValueAt(1, 0);
        JOptionPane.showMessageDialog(null, str);
    }

Can you show your code here to see what you have done?

I still get an error."Illigal start of expression".In my code i want when i click the button,to get the values in the table and do some calculations on it.Can you figure out why the error msg is showing.Here is my code

/*public Object GetData(JTable xenon, int row_index, int col_index){
return xenon.getModel().getValueAt(row_index, col_index);
} */

[Manfizy]

I still get an error."Illigal start of expression".In my code i want when i click the button,to get the values in the table and do some calculations on it.Can you figure out why the error msg is showing.Here is my code

/*public Object GetData(JTable xenon, int row_index, int col_index){
return xenon.getModel().getValueAt(row_index, col_index);
} */

Sorry that was the wrong code.It should be like this:


private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
public void GetTableValues() {
String str = (String) Xenon.getValueAt(1, 0);
JOptionPane.showMessageDialog(null, str);
}

[radix]

Hi Manfizy,

Try this:

JOptionPane.showMessageDialog(null,jTable1.getValueAt(1,0).toString());

[Eranga]

Sorry that was the wrong code.It should be like this:


private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
public void GetTableValues() {
String str = (String) Xenon.getValueAt(1, 0);
JOptionPane.showMessageDialog(null, str);
}

This is wrong. How can you call a method like this.

private void jButton1MouseClicked(java.awt.event.MouseEvent evt)  {
      GetTableValues();
}

public void GetTableValues() {
        String str = (String) Xenon.getValueAt(1, 0);
        JOptionPane.showMessageDialog(null, str);   
}

[Manfizy]

This is wrong. How can you call a method like this.

private void jButton1MouseClicked(java.awt.event.MouseEvent evt)  {
      GetTableValues();
}

public void GetTableValues() {
        String str = (String) Xenon.getValueAt(1, 0);
        JOptionPane.showMessageDialog(null, str);   
}

Hi Eranga,
Thank you so much.its working now

[Manfizy]

Thank you for your replies,am progressing.
Another question:
my table can only display fixed data.i want it to update and store data each time i run the program.how can i do that?
Thank you in advance

[Eranga]

In that case you have to use a data model.

[Manfizy]

In that case you have to use a data model.

Data model?i tried using a table model but i didnt know how to make it work.How do i go about this?

[Eranga]

Can you show here what you have tried.

[Manfizy]

Can you show here what you have tried.

Ok this is the code:


package MyXenonConc;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableModel;

public class XenonConcUI extends javax.swing.JFrame {
final String[] columnNames = {"Time(hh:mm)",
"Power Level(%)"};

final Object[][] data = {
{ new Float(5), new Integer(20)},
{ new Float(3), new Integer(23)},
{ new Float(2), new Integer(27)},
{new Float(20), new Integer(35)},
{new Float(10), new Integer(41)}
};

private boolean DEBUG = false;
private boolean ALLOW_COLUMN_SELECTION = true;
private boolean ALLOW_ROW_SELECTION = true;

/** Creates new form XenonConcUI */
public XenonConcUI() {
initComponents();
JTable Xenon = new JTable(new XenonConcUI());
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;

ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No columns are selected.");
} else {
int selectedCol = lsm.getMinSelectionIndex();
System.out.println("Column " + selectedCol
+ " is now selected.");
}
}

This was just trial and error.Could you please show me how to go about it?
Thank you

[Manfizy]

Ok this is the code:


package MyXenonConc;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableModel;

public class XenonConcUI extends javax.swing.JFrame {
final String[] columnNames = {"Time(hh:mm)",
"Power Level(%)"};

final Object[][] data = {
{ new Float(5), new Integer(20)},
{ new Float(3), new Integer(23)},
{ new Float(2), new Integer(27)},
{new Float(20), new Integer(35)},
{new Float(10), new Integer(41)}
};

private boolean DEBUG = false;
private boolean ALLOW_COLUMN_SELECTION = true;
private boolean ALLOW_ROW_SELECTION = true;

/** Creates new form XenonConcUI */
public XenonConcUI() {
initComponents();
JTable Xenon = new JTable(new XenonConcUI());
public void valueChanged(ListSelectionEvent e) {
//Ignore extra messages.
if (e.getValueIsAdjusting()) return;

ListSelectionModel lsm = (ListSelectionModel)e.getSource();
if (lsm.isSelectionEmpty()) {
System.out.println("No columns are selected.");
} else {
int selectedCol = lsm.getMinSelectionIndex();
System.out.println("Column " + selectedCol
+ " is now selected.");
}
}

This was just trial and error.Could you please show me how to go about it?
Thank you

How can i diplay several values on the same pane?with the code show below i can only display the value of one cell

private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
GetTableValues();
}

public void GetTableValues() {
String str = (String) Xenon.getValueAt(1, 0);
JOptionPane.showMessageDialog(null, str);
}
Thank you

[Eranga]

If you want to deal with different cells, you need to change index values on getValueAt() method. It's designing is depends on your application. You should think about a way to get all values.

If you want to get all cell values, use a loop. May be two for loops, one for rows and the other columns.

[Manfizy]

As i told you earlier that am very new to java,i tried using loops but it couldnt work the way i expected.Using the code displaying a single cell value,could you please write an example so that i can get an idea?
Thank you