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Код



public class Testing {
    public void buildGUI() {
        JTabbedPane tp = new JTabbedPane();
        tp.addTab("A", getPanel("A"));
    

        JFrame f = new JFrame();
        f.getContentPane().add(tp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public JPanel getPanel(String tabText) {
        JPanel p = new JPanel();
        p.add(new JLabel(tabText));
        return p;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Testing().buildGUI();
            }
        });
    }
}

Код


 ...
 implements MouseListener
 ...
 tp.addMouseListener(this);
 ...

 public void mouseClicked(MouseEvent e)
 {
  Component comp = tp.getSelectedComponent();
  tp.setPreferredSize(new Dimension(0, 0));
  JFrame main = (JFrame)tp.getParent().getParent().getParent().getParent(); // бред блин :) (лучше сделай ссылку на JFrame,
                                                                                   // через которую можно легко обращаться к нему)
  main.pack();
 }

Код



public class Testing implements MouseListener {
    private JTabbedPane tp;
    private JFrame f;
    private JPanel mainP;

    public void buildGUI() {
        f = new JFrame();
        mainP = new JPanel();
        tp = new JTabbedPane();
        tp.setBackground(Color.BLUE);
        tp.addTab("A", getPanel("A"));
        tp.addMouseListener(this);

        mainP.setLayout(new BoxLayout(mainP, BoxLayout.Y_AXIS));
        mainP.add(tp);
        mainP.add(new JButton("TEST"));
        f.add(mainP);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public JPanel getPanel(String tabText) {
        JPanel p = new JPanel();
        p.add(new JLabel(tabText));
        return p;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        Component comp = tp.getSelectedComponent();
        tp.setPreferredSize(new Dimension(0, 20));
        f.pack();
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Testing().buildGUI();
            }
        });
    }
}

Код


 public void mouseClicked(MouseEvent e)
 {
  int index = tp.getSelectedIndex();
  Rectangle rect = tp.getBoundsAt(index);
  tp.setPreferredSize(new Dimension(0, rect.height));
  ...

Код


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

public class Main implements ActionListener, MouseListener

{
 JFrame f = new JFrame();
 JTabbedPane tp = new JTabbedPane();
 JButton jb = new JButton("change placement");
 private int [] placement = {JTabbedPane.TOP,
                             JTabbedPane.BOTTOM,
                             JTabbedPane.LEFT,
                             JTabbedPane.RIGHT};

 public void Main()
 {
  tp.addMouseListener(this);

  tp.addTab("A", getPanel("A"));
  tp.addTab("B", getPanel("B"));
  tp.addTab("<html><center>C<br>second line", getPanel("C"));
  tp.addTab("DDDD", getPanel("D"));
    
  f.getContentPane().add(tp);
  f.setBounds(100, 100, 400, 300);
  f.setLocationRelativeTo(null);
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.setVisible(true);

  f.add(jb, "South");
  jb.addActionListener(this);
 }

 public void actionPerformed(ActionEvent e)
 {
  setPlacement();
 }

 private void setPlacement()
 {
  int i = tp.getTabPlacement();
  i++;
  tp.setTabPlacement(placement [i % 4]);
 }

 public void mouseEntered(MouseEvent e){}
 public void mouseExited(MouseEvent e){}
 public void mouseClicked(MouseEvent e)
 {
  int pm = tp.getTabPlacement();

  if(pm == 1 || pm == 3)
   tp.setPreferredSize(new Dimension(fullWidth() + 8, maxHeight() + 8));
  else
   tp.setPreferredSize(new Dimension(maxWidth() + 8, fullHeight() + 8));

  f.pack();
 }
 public void mousePressed(MouseEvent e){}
 public void mouseReleased(MouseEvent e){}

 private int maxWidth()
 {
  int width = 0;

  for(int i = 0; i < tp.getTabCount(); i++)
  {
   Rectangle rect = tp.getBoundsAt(i);

   if(width < rect.width)
    width = rect.width;
  }
  return width;
 }

 private int maxHeight()
 {
  int height = 0;

  for(int i = 0; i < tp.getTabCount(); i++)
  {
   Rectangle rect = tp.getBoundsAt(i);

   if(height < rect.height)
    height = rect.height;
  }
  return height;
 }

 private int fullWidth()
 {
  int width = 0;

  for(int i = 0; i < tp.getTabCount(); i++)
  {
   Rectangle rect = tp.getBoundsAt(i);
   width += rect.width;
  }
  return width;
 }

 private int fullHeight()
 {
  int height = 0;

  for(int i = 0; i < tp.getTabCount(); i++)
  {
   Rectangle rect = tp.getBoundsAt(i);
   height += rect.height;
  }
  return height;
 }

 public JPanel getPanel(String tabText)
 {
  JPanel p = new JPanel();
  p.add(new JLabel(tabText));
  return p;
 }

 public static void main(String[] args) {
  SwingUtilities.invokeLater(new Runnable() {
   public void run() {
    new Main().Main();
   }
  });
 }
}