insert row and column and delete row and column

[daredavil82]

hiiii....im new here...can any one help me to solve the problem of this coding...i can compile but cannot run the code...plz help me....

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import java.io.*;
import java.util.Vector;

public class TableModelDemo extends JApplet {
// Create table column names
private String[] columnNames =
{"Country", "Capital", "Population in Millions", "Democracy"};

// Create table data
private Object[][] rowData = {
{"USA", "Washington DC", 280, true},
{"Canada", "Ottawa", 32, true},
{"United Kingdom", "London", 60, true},
{"Germany", "Berlin", 83, true},
{"France", "Paris", 60, true},
{"Norway", "Oslo", 4.5, true},
{"India", "New Deli", 1046, true}
};

// Create a table model
private DefaultTableModel tableModel = new DefaultTableModel(
rowData, columnNames);

// Create a table
private JTable jTable1 = new JTable(tableModel);

// Create buttons
private JButton jbtAddRow = new JButton("Add New Row");
private JButton jbtAddColumn = new JButton("Add New Column");
private JButton jbtDeleteRow = new JButton("Delete Selected Row");
private JButton jbtDeleteColumn = new JButton(
"Delete Selected Column");
private JButton jbtSave = new JButton("Save");
private JButton jbtClear = new JButton("Clear");
private JButton jbtRestore = new JButton("Restore");

// Create a combo box for selection modes
private JComboBox jcboSelectionMode =
new JComboBox(new String[] {"SINGLE_SELECTION",
"SINGLE_INTERVAL_SELECTION", "MULTIPLE_INTERVAL_SELECTION"});

// Create check boxes
private JCheckBox jchkRowSelectionAllowed =
new JCheckBox("RowSelectionAllowed", true);
private JCheckBox jchkColumnSelectionAllowed =
new JCheckBox("ColumnSelectionAllowed", false);

public TableModelDemo() {
JPanel panel1 = new JPanel();
panel1.setLayout(new GridLayout(2, 2));
panel1.add(jbtAddRow);
panel1.add(jbtAddColumn);
panel1.add(jbtDeleteRow);
panel1.add(jbtDeleteColumn);

JPanel panel2 = new JPanel();
panel2.add(jbtSave);
panel2.add(jbtClear);
panel2.add(jbtRestore);

JPanel panel3 = new JPanel();
panel3.setLayout(new BorderLayout(5, 0));
panel3.add(new JLabel("Selection Mode"), BorderLayout.WEST);
panel3.add(jcboSelectionMode, BorderLayout.CENTER);

JPanel panel4 = new JPanel();
panel4.setLayout(new FlowLayout(FlowLayout.LEFT));
panel4.add(jchkRowSelectionAllowed);
panel4.add(jchkColumnSelectionAllowed);

JPanel panel5 = new JPanel();
panel5.setLayout(new GridLayout(2, 1));
panel5.add(panel3);
panel5.add(panel4);

JPanel panel6 = new JPanel();
panel6.setLayout(new BorderLayout());
panel6.add(panel1, BorderLayout.SOUTH);
panel6.add(panel2, BorderLayout.CENTER);

add(panel5, BorderLayout.NORTH);
add(new JScrollPane(jTable1),
BorderLayout.CENTER);
add(panel6, BorderLayout.SOUTH);

// Initialize table selection mode
jTable1.setSelectionMode(ListSelectionModel.SINGLE _SELECTION);

jbtAddRow.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (jTable1.getSelectedRow() >= 0)
tableModel.insertRow (jTable1.getSelectedRow(),
new java.util.Vector());
else
tableModel.addRow(new java.util.Vector());
}
});

jbtAddColumn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String name = JOptionPane.showInputDialog("New Column Name");
tableModel.addColumn(name, new java.util.Vector());
}
});

jbtDeleteRow.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(jTable1.getSelectedRow() >= 0)
tableModel.removeRow(jTable1.getSelectedRow());
}
});

jbtDeleteColumn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (jTable1.getSelectedColumn() >= 0) {
TableColumnModel columnModel = jTable1.getColumnModel();
TableColumn tableColumn =
columnModel.getColumn(jTable1.getSelectedColumn()) ;
columnModel.removeColumn(tableColumn);
}
}
});

jbtSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream("tablemodel.dat"));
out.writeObject(tableModel.getDataVector());
out.writeObject(getColumnNames());
out.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
});

jbtClear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tableModel.setRowCount(0);
}
});

jbtRestore.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
ObjectInputStream in = new ObjectInputStream(
new FileInputStream("tablemodel.dat"));
Vector rowData = (Vector)in.readObject();
Vector columnNames = (Vector)in.readObject();
tableModel.setDataVector(rowData, columnNames);
in.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
});

jchkRowSelectionAllowed.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jTable1.setRowSelectionAllowed(
jchkRowSelectionAllowed.isSelected());
}
});

jchkColumnSelectionAllowed.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
jTable1.setColumnSelectionAllowed(
jchkColumnSelectionAllowed.isSelected());
}
});

jcboSelectionMode.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String selectedItem =
(String) jcboSelectionMode.getSelectedItem();
if (selectedItem.equals("SINGLE_SELECTION"))
jTable1.setSelectionMode(
ListSelectionModel.SINGLE_SELECTION);
else if (selectedItem.equals("SINGLE_INTERVAL_SELECTION"))
jTable1.setSelectionMode(
ListSelectionModel.SINGLE_INTERVAL_SELECTION);
else if (selectedItem.equals("MULTIPLE_INTERVAL_SELECTION" ))
jTable1.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
}
});
}

private Vector getColumnNames() {
Vector<String> columnNames = new Vector<String>();

for (int i = 0; i < jTable1.getColumnCount(); i++)
columnNames.add(jTable1.getColumnName(i));

return columnNames;
}

}

[revathi17]

From the code you have posted I could see a problem only in this line

jTable1.setSelectionMode(ListSelectionModel.SINGLE _SELECTION);

There is a space before the underscore. When i removed it, I was able to compile and run the code fine.
It seems to work fine for me...

Do you get any errors??

[daredavil82]

went i compile run the code...it will come out masage....

java.lang.NoSuchMethodError: main
Exception in thread "main"
Process completed.




any one can solve this problem plz...

[ShoeNinja]

You need to have a main method somewhere in the project.

Code:

public static void main(String[] args){
//instantiate objects and call methods.
}

[daredavil82]

i already try to put this code.but still cannot work..

public static void main(String[] args){
TableModelDemo table=new TableModelDemo();
}

[ShoeNinja]

Are you getting a compiler error or what?

[daredavil82]

after compile and run i cannot see any output..wat can i see only blank output...i use jCreator 4 to compile and run..

[revathi17]

You need to run the program as Java applet instead of a Java application. I use eclipse and I run your program as Java applet it works fine. I am not sure how you do that in JCreator.
If you run as JApplet the init() method of the applet is automatically invoked and you don't need a 'main()' method in that case.

-R