Trouble adding actionlistener to a panel in a tabbed pane
Hi, please help me! this is the code i wrote, with the error given below:
CODE:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class tabslisten extends JApplet
JPanel RecPanel;
GridBagLayout gbl;
GridBagConstraints gbc;
public void init ()
FlowLayout flow;
flow = new FlowLayout();
Container content = getContentPane();
content.setLayout(new GridLayout());
JTabbedPane tabpane = new JTabbedPane();
content.add(tabpane, flow);
RecPanel = new JPanel();
recipientDetails();
tabpane.addTab("Recipient Details", null, RecPanel, "Recipient Details");
public void recipientDetails()
JLabel lblRecFName;
JLabel lblRecLName;
JTextField txtRecFName;
JTextField txtRecLName;
JButton btnValidate;
gbl = new GridBagLayout();
gbc = new GridBagConstraints();
RecPanel.setLayout(gbl);
lblRecFName = new JLabel("First Name");
lblRecLName = new JLabel("Last Name");
txtRecFName = new JTextField(8);
txtRecLName = new JTextField(5);
btnValidate= new JButton("Validate");
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 1;
gbc.gridy = 8;
gbl.setConstraints(lblRecFName, gbc);
RecPanel.add(lblRecFName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 8;
gbl.setConstraints(txtRecFName, gbc);
RecPanel.add(txtRecFName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 1;
gbc.gridy = 11;
gbl.setConstraints(lblRecLName, gbc);
RecPanel.add(lblRecLName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 11;
gbl.setConstraints(txtRecLName, gbc);
RecPanel.add(txtRecLName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 32;
gbl.setConstraints(btnValidate, gbc);
RecPanel.add(btnValidate);
validateAction validateButton = new validateAction();
btnValidate.addActionListener(validateButton);
class validateAction implements ActionListener
public void actionPerformed(ActionEvent evt)
Object obj = evt.getSource();
if (obj == btnValidate)
String fName = txtRecFName.getText();
String lName = txtRecLName.getText();
if (fName.length()==0)
getAppletContext().showStatus("First Name not entered.");
return;
else if (lName.length()==0)
getAppletContext().showStatus("Last Name not entered.");
return;
else
getAppletContext().showStatus("Successful.");
ERROR:
tabslisten.java:90: Undefined variable: btnValidate
if (obj == btnValidate)
^
tabslisten.java:92: Undefined variable or class name: txtRecFName
String fName = txtRecFName.getText();
^
tabslisten.java:93: Undefined variable or class name: txtRecLName
String lName = txtRecLName.getText();
^
3 errors
Press any key to continue...
I'm sure I'm doing something really stupid, but I don't know what! ANY and ALL help will be appreciated! Thanks!
I copied your program and ran it. It works fine. Make sure the three variables you made class variables are only defined in one place. (ie you moved them not copied them). Other than that I have no ideas.
With regards to naming conventions. My only comment is, take a look at the Java API.
1) classes have uppercased words. Examples from your program - JTextField, Container, FlowLayout, GridLayout...
2) methods and variable names don't upper case the first word - getContentPane(), setLayout()...
Here is the program that works for me:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FirstApplet extends JApplet
JPanel RecPanel;
GridBagLayout gbl;
GridBagConstraints gbc;
JTextField txtRecFName;
JTextField txtRecLName;
JButton btnValidate;
public void init ()
System.out.println("hello there");
FlowLayout flow;
flow = new FlowLayout();
Container content = getContentPane();
content.setLayout(new GridLayout());
JTabbedPane tabpane = new JTabbedPane();
content.add(tabpane, flow);
RecPanel = new JPanel();
recipientDetails();
tabpane.addTab("Recipient Details", null, RecPanel, "Recipient Details");
public void recipientDetails()
JLabel lblRecFName;
JLabel lblRecLName;
gbl = new GridBagLayout();
gbc = new GridBagConstraints();
RecPanel.setLayout(gbl);
lblRecFName = new JLabel("First Name");
lblRecLName = new JLabel("Last Name");
txtRecFName = new JTextField(8);
txtRecLName = new JTextField(5);
btnValidate= new JButton("Validate");
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 1;
gbc.gridy = 8;
gbl.setConstraints(lblRecFName, gbc);
RecPanel.add(lblRecFName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 8;
gbl.setConstraints(txtRecFName, gbc);
RecPanel.add(txtRecFName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 1;
gbc.gridy = 11;
gbl.setConstraints(lblRecLName, gbc);
RecPanel.add(lblRecLName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 11;
gbl.setConstraints(txtRecLName, gbc);
RecPanel.add(txtRecLName);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.gridx = 4;
gbc.gridy = 32;
gbl.setConstraints(btnValidate, gbc);
RecPanel.add(btnValidate);
validateAction validateButton = new validateAction();
btnValidate.addActionListener(validateButton);
class validateAction implements ActionListener
public void actionPerformed(ActionEvent evt)
Object obj = evt.getSource();
if (obj == btnValidate)
String fName = txtRecFName.getText();
String lName = txtRecLName.getText();
if (fName.length()==0)
getAppletContext().showStatus("First Name not entered.");
return;
else if (lName.length()==0)
getAppletContext().showStatus("Last Name not entered.");
return;
else
getAppletContext().showStatus("Successful.");
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