JamesCherrill
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JTable delete row
I'm using a JTable with a DefaultTableModel. I use the Load Button for populating the JTable.
Anyway, the problem I have is with the Delete row button. (defaulttablemodel.removeRow).
This is the whole project:
package proiect1;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import java.io.*;
import javax.swing.event.*;
import javax.swing.table.TableModel;
import java.util.ArrayList;
import javax.swing.table.AbstractTableModel;
public class tabel extends javax.swing.JFrame implements TableModelListener {
DefaultTableModel model1;
private static ArrayList<clasaIntrebare> listaIntrebari = new ArrayList<clasaIntrebare>();
private static int n;
public tabel() {
initComponents();
model1= new DefaultTableModel() {
@Override
public boolean isCellEditable(int row, int column) {
if (column == 2 || column == 1 || column == 6)
return false;
return true;
}
};
tabel.setModel(model1);
model1.addColumn("Enunt");
model1.addColumn("Tip");
model1.addColumn("ID");
model1.addColumn("Varianta 1");
model1.addColumn("Varianta 2");
model1.addColumn("Varianta 3");
model1.addColumn("Var. corecta");
TableColumn col = tabel.getColumnModel().getColumn(0);
col.setPreferredWidth(100);
col=tabel.getColumnModel().getColumn(1);
col.setPreferredWidth(35);
col=tabel.getColumnModel().getColumn(2);
col.setPreferredWidth(35);
}
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
tabel = new javax.swing.JTable();
Load = new javax.swing.JButton();
control = new javax.swing.JLabel();
deleteRow = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
tabel.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane1.setViewportView(tabel);
Load.setText("Load");
Load.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
LoadActionPerformed(evt);
}
});
control.setText("here: ");
deleteRow.setText("Delete Row");
deleteRow.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
deleteRowActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(deleteRow)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 19, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 510, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(Load)
.addGap(107, 107, 107)
.addComponent(control, javax.swing.GroupLayout.PREFERRED_SIZE, 187, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 287, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 30, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(deleteRow)
.addGap(58, 58, 58)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(Load)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addComponent(control, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(29, 29, 29))))
);
pack();
}// </editor-fold>
public int corect(String raspuns){
String x,y="";
try
{
BufferedReader in = new BufferedReader(new FileReader("raspunsuri.txt"));
while ((x = in.readLine()) != null)
{
y+=x;
}
// Close our input stream
in.close();
}
// Catches any error conditions
catch (IOException e)
{
System.err.println ("Unable to read from file");
System.exit(-1);
}
if (y.indexOf(raspuns)>=0) // raspuns corect
return 1;
else // rasp incorect
return 0;
}
private void LoadActionPerformed(java.awt.event.ActionEvent evt) {
String str;
String enunt="", var1,var2,var3;
int tip, cod, corect=0;
MD5 obiect= new MD5();
this.loadQ();
int i=0;
while (i<n){
enunt=listaIntrebari.get(i).getenunt();
tip=listaIntrebari.get(i).gettip();;
cod=listaIntrebari.get(i).getcod();
var1=listaIntrebari.get(i).getraspuns1();
var2=listaIntrebari.get(i).getraspuns2();
var3=listaIntrebari.get(i).getraspuns3();
str=obiect.crypt(Integer.toString(cod)+" "+ "true" + " "+ "false" +" " + "false");
if (corect(str)==1)
corect=1;
str=obiect.crypt(Integer.toString(cod)+" "+ "false" +" " + "true" + " "+ "false");
if (corect(str)==1)
corect=2;
str=obiect.crypt(Integer.toString(cod)+" "+ "false" +" " +"false"+" "+"true");
if (corect(str)==1)
corect=3;
model1.addRow(new Object[]{enunt, tip, cod, var1, var2, var3, corect});
i++;
}
model1.addTableModelListener(this);
//adaugareRow.setVisible(false);
//adaugareRow.setVisible(true);
//Load.setEnabled(false);
}
private void deleteRowActionPerformed(java.awt.event.ActionEvent evt) {
try{
model1.removeRow(0);
tabel.revalidate();
}
catch (ArrayIndexOutOfBoundsException e){
System.out.println("error");
e.printStackTrace();
};
}
public void loadQ(){
String str;
try{
BufferedReader in = new BufferedReader(new FileReader("intrebari.txt"));
while ( (str=in.readLine()) != null){
listaIntrebari.add(n, new clasaIntrebare(str,
Integer.parseInt(in.readLine()), Integer.parseInt(in.readLine()),
in.readLine(), in.readLine(), in.readLine() ) );
n++;
}
in.close();
}
catch(IOException e){
System.err.println("Cannot read from file.");
System.exit(-1);
}
}
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object data = model.getValueAt(row, column);
listaIntrebari.get(e.getFirstRow()).setenunt((String)model1.getValueAt(row, column));
// Load.setText((String)model1.getValueAt(row, column));
System.out.println("change: "+ Integer.toString(e.getFirstRow())+" " + Integer.toString(e.getColumn()));
//control.setText(listaIntrebari.get(e.getFirstRow()).getenunt());
control.setText(Integer.toString(column));
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new tabel().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton Load;
private javax.swing.JLabel control;
private javax.swing.JButton deleteRow;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable tabel;
// End of variables declaration
}run: error java.lang.ArrayIndexOutOfBoundsException: Array index out of range: -1 at java.util.Vector.removeElementAt(Vector.java:515) at javax.swing.table.DefaultTableModel.removeRow(DefaultTableModel.java:446) at proiect1.tabel.deleteRowActionPerformed(tabel.java:253) at proiect1.tabel.access$100(tabel.java:24) at proiect1.tabel$3.actionPerformed(tabel.java:116) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6267) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6032) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
NetBeans generates the code, can't change it.
clasaIntrebare.java:
package proiect1;
import java.util.ArrayList;
public class clasaIntrebare {
private String enunt;
private int cod;
private int tip;
private int used;
private String raspuns1;
private String raspuns2;
private String raspuns3;
public String getenunt(){
return this.enunt;
}
public int getcod(){
return this.cod;
}
public int gettip(){
return this.tip;
}
public String getraspuns1(){
return this.raspuns1;
}
public String getraspuns2(){
return this.raspuns2;
}
public String getraspuns3(){
return this.raspuns3;
}
public int getused(){
return this.used;
}
public void setused(){
this.used=1;
}
public void setenunt(String enunt){
this.enunt=enunt;
}
public void setcod(int cod){
this.cod=cod;
}
public void settip(int tip){
this.tip=tip;
}
public void setraspuns1(String raspuns1){
this.raspuns1=raspuns1;
}
public void setraspuns2(String raspuns2){
this.raspuns2=raspuns2;
}
public void setraspuns3(String raspuns3){
this.raspuns3=raspuns3;
}
public clasaIntrebare(String Enunt, int Tip, int Cod,
String Raspuns1, String Raspuns2,
String Raspuns3){
cod= Cod; // ID
used=0;
tip= Tip; // type: radio/checkbox
enunt= Enunt; //question
raspuns1= Raspuns1; //choice 1
raspuns2= Raspuns2; //choice 2
raspuns3= Raspuns3; // choice 3
}
}Working now:
private void deleteRowActionPerformed(java.awt.event.ActionEvent evt) {
try{
//model1.removeRow(tabel.getSelectedRow()); replaced with:
((DefaultTableModel)tabel.getModel()).removeRow(tabel.getSelectedRow()); // -> why does this work and above doesn't?
tabel.revalidate();
}
catch (ArrayIndexOutOfBoundsException e){
System.out.println("error");
e.printStackTrace();
};
}
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
if (e.getType()!=-1)
{
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object data = model.getValueAt(row, column); // ->>>>>>>> how to access this?
listaIntrebari.get(e.getFirstRow()).setenunt((String)model1.getValueAt(row, column));
System.out.println("change: "+ Integer.toString(e.getFirstRow())+" " + Integer.toString(e.getColumn()));
control.setText(listaIntrebari.get(e.getFirstRow()).getenunt());
}
else
control.setText("deleted " + listaIntrebari.get(row).getenunt());
}
The pieces of code using getValueAt(x, column) generated errors becausee.getColumn() is -1.
I added the tableChanged listener to be able to update my arrayList whenever a cell list is modified. I tried using e.getType() to check if the event is DELETE. (delete event : e.getType() returns -1), which works. If anyone has any suggestions about how to do this more graciously, please share.
====
Some explanation for lines 8, 28 please?
This article has been dead for over three months
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