Gridbag layout problem on a tabbedpane

Question

I am not sure whether we can do this or not but, I am trying to have a gridbag layout on a TabbedPane object.
I have a JFrame on which I am adding a TabbedPane object called "t" and on this TabbedPane I am adding a tab called "Insert" which is an object of class "Insert Data". Then, I add the TabbedPane t on the Container cp, which is inside the JFrame.
In the InsertData Class (a JPanel), I need to have the gridbag layout. With this gridbag layout object, I am trying to place different objects like buttons, at various places, on this JPanel. But nothing moves on this panel.
In short, please let me know how can I have a gridbag layout on a Tabbedpane.
The Main Class is as follows:
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Main extends JFrame implements ActionListener, ChangeListener{
     Main(){
               setPreferredSize(new Dimension(1200,600));
               Container cp = getContentPane();
               JTabbedPane t = new JTabbedPane();
               // insert
               InsertData insertOptions = new InsertData();
               t.addTab("Insert",insertOptions);
               cp.add(t);
               this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               pack();
               setVisible(true);
          @Override
          public void actionPerformed(ActionEvent arg0) {
               // TODO Auto-generated method stub
          @Override
          public void stateChanged(ChangeEvent arg0) {
               // TODO Auto-generated method stub
          public static void main(String args[]){
               new Main();
     }The InsertDataClass is:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class InsertData extends JPanel{
     InsertData(){
          setPreferredSize(new Dimension(1200,600));
          setBackground(Color.blue);
          //setLayout(new GridBagLayout());
          GridBagLayout gb = new GridBagLayout();
          setLayout(gb);
          GridBagConstraints c = new GridBagConstraints();
          //c.insets = new Insets(2, 2, 2, 2);
          //JPanel p1= new JPanel();
          //p1.setPreferredSize(new Dimension(200,200));
          JButton b1 = new JButton("here i am!!!");
          //p1.add(b1);
          //c.fill = GridBagConstraints.HORIZONTAL;
          //c.anchor = GridBagConstraints.WEST;
          c.gridx=0;
          c.gridy=1;
          add(b1,c);
}

Answer 1

how can I have a gridbag layout on a Tabbedpane.Huh? You post an example with just one JButton and no weightx / weighty set and you expect others here to be able to see a problem with your layout?
Also, there's needless, unused code that is just clutter -- like the unimplemented ActionListener and ChaneListener. Recommended reading: [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://mindprod.com/jgloss/sscce.html].
Finally, I don't see any need whatsoever to extend JFrame and JPanel as you are not introducing any new behavior of either. Always favor composition over inheritance.
I plugged in some code I had used for someone else's GridBagLayout problems and this will show you that there's no difference in using GridBagLayout in a tabbed pane component or anywhere else.import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.*;
public class GridBagInTabbedPane {
  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        new GridBagInTabbedPane().makeUI();
  public void makeUI() {
    Font fontButton = new Font("Arial", Font.BOLD, 10);
    Font fontLabel = new Font("Arial", Font.BOLD, 15);
    JLabel labelEnter = new JLabel("Enter sentences in the text area ");
    labelEnter.setFont(fontLabel);
    JTextArea textArea = new JTextArea();
    textArea.setPreferredSize(new Dimension(630, 280));
    JScrollPane scrollPane = new JScrollPane(textArea);
    scrollPane.setMinimumSize(new Dimension(630, 280));
    JLabel labelDuplicates = new JLabel("Duplicates will appear here");
    labelDuplicates.setMinimumSize(new Dimension(650, 30));
    labelDuplicates.setFont(fontLabel);
    JButton buttonDisplay = new JButton("Display Map");
    buttonDisplay.setFont(fontButton);
    JButton buttonClear = new JButton("Clear");
    buttonClear.setFont(fontButton);
    JPanel panel = new JPanel(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.gridwidth = 2;
    gbc.fill = GridBagConstraints.NONE;
    gbc.anchor = GridBagConstraints.CENTER;
    gbc.insets = new Insets(5, 5, 5, 5);
    gbc.weightx = 0.5;
    panel.add(labelEnter, gbc);
    gbc.gridy = 1;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.weighty = 0.5;
    panel.add(scrollPane, gbc);
    gbc.gridy = 2;
    gbc.fill = GridBagConstraints.NONE;
    gbc.weighty = 0.0;
    panel.add(labelDuplicates, gbc);
    gbc.gridy = 3;
    gbc.gridwidth = 1;
    gbc.anchor = GridBagConstraints.EAST;
    panel.add(buttonDisplay, gbc);
    gbc.gridx = 1;
    gbc.anchor = GridBagConstraints.WEST;
    panel.add(buttonClear, gbc);
    JTabbedPane tabbedPane = new JTabbedPane();
    tabbedPane.add(panel);
    JFrame frame = new JFrame();
    frame.add(tabbedPane);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}db