Thread: Adding add/remove button to add/remove tab

Can anyone help me with this code. I'm a beginner on java programming. I'm using netbeans JFrame Form, I added 2 buttons for my add and remove then a tabbed pane. The buttons doesn't work.


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class BulletinBoard extends javax.swing.JFrame {

public class Tab{


public Tab(){
add.addActionListener(new MyAction());
remove.addActionListener(new MyAction());
}

public class MyAction implements ActionListener{
public void actionPerformed(ActionEvent e){
String str = e.getActionCommand();
if(add.equals(str)){
String st = JOptionPane.showInputDialog(null, "Enter Tab Name.");
if(!st.equals("")){
JPanel panel2 = new JPanel();
JLabel label = new JLabel("Your program is working successfully.");
panel2.add(label);
tab.add(st, panel2);
}
}
else if(str.equals(remove)){
tab.remove(tab.getTabCount()-1);
}
}
}

}
/** Creates new form BulletinBoard */
public BulletinBoard() {
initComponents();
Tab ar = new Tab();
}


/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
}
public void run() {
new BulletinBoard().setVisible(true);
}
});
}









This is the code that I follow, it is hard coded, but I can't implement it.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class Tab{
JTabbedPane tab;
public static void main(String[] args){
Tab ar = new Tab();
}

public Tab(){
JFrame frame = new JFrame("Add Remove Tab Frame");
tab = new JTabbedPane();
frame.add(tab, BorderLayout.CENTER);
JPanel panel = new JPanel();
JButton button = new JButton("Add Tab");
button.addActionListener(new MyAction());
panel.add(button);
tab.add("Add", panel);
JPanel panel1 = new JPanel();
JButton button1 = new JButton("Remove Tab");
button1.addActionListener(new MyAction());
panel1.add(button1);
tab.add("Remove ", panel1);
frame.setSize(400, 400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
}

public class MyAction implements ActionListener{
public void actionPerformed(ActionEvent e){
String str = e.getActionCommand();
if(str.equals("Add Tab")){
String st = JOptionPane.showInputDialog(null, "Enter Tab Name.");
if(!st.equals("")){
JPanel panel2 = new JPanel();
JLabel label = new JLabel("Your program is working successfully.");
panel2.add(label);
tab.add(st, panel2);
}
}
else if(str.equals("Remove Tab")){
tab.remove(tab.getTabCount()-1);
}
}
}
}

buttons doesn't work.

Please explain.
Does the code compile without errors? If not post the full text of the error messages.
Is the listener method for the buttons called? Add a println first thing in the listener method that prints out the value of the event that is passed to the method to see if the method is called.

the remove button don't work properly, it als.

Please explain what "als" means?

Is the listener method for the buttons called? Add a println first thing in the listener method that prints out the value of the event that is passed to the method to see if the method is called.

Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting

What do you mean by "don't work properly"? Does it not display something? Does it display something you don't want it to? Does it sprout a head and start talking to you?

By the way, this looks like a job for CardLayout. Save yourself the trouble and don't reinvent the wheel.

When will this evaluate to false?

if(add.equals(add)){