Question : Java Gui, customized object focus and resize

Hi: I am using Java 6. I now could draw customized object in JPanel. But I do not know how let if be focused visible and how to resize it.
Code is attached. How could I let Clazz (extends JComponent) be focused and resized?

  
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============DndTest.java===========

package juhan.exer.dnd;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/**
 *
 * @author juhshen
 */
public class DndTest extends JFrame {
    private JDesktopPane dp = new JDesktopPane();
    private JSequencePanel sequenceDiagram = new JSequencePanel();

public DndTest(){
    super("Dnd Test");
    init();
}

private void init() {
   setJMenuBar(createDummyMenuBar());
   getContentPane().add(createDummyToolBar(), BorderLayout.NORTH);

   JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, 
                                                          dp, sequenceDiagram);
   sp.setDividerLocation(120);
   getContentPane().add(sp);
   sequenceDiagram.addClass(new Clazz());
 
   
}

private JToolBar createDummyToolBar() {
        JToolBar tb = new JToolBar();
        JButton b;
        b = new JButton("New");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Open");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Save");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Print");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Preview");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        tb.setFloatable(false);
        return tb;
    }

    private JMenuBar createDummyMenuBar() {
        JMenuBar mb = new JMenuBar();
        mb.add(createDummyMenu("File"));
        mb.add(createDummyMenu("Edit"));
        mb.add(createDummyMenu("Search"));
        mb.add(createDummyMenu("View"));
        mb.add(createDummyMenu("Tools"));
        mb.add(createDummyMenu("Help"));

        JMenu demo = new JMenu("Demo");
        demo.setMnemonic(KeyEvent.VK_D);
        mb.add(demo);

        return mb;
    }

    private JMenu createDummyMenu(String str) {
        JMenu menu = new JMenu(str);
        JMenuItem item = new JMenuItem("[Empty]");
        item.setEnabled(false);
        menu.add(item);
        return menu;
    }

 public static void main(final String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
       public void run() {
                //Turn off metal's use of bold fonts
	   UIManager.put("swing.boldMetal", Boolean.FALSE);
           createAndShowGUI(args);
       }

       private void createAndShowGUI(String[] args) {
           try {
              UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
           } catch (Exception e) {
           }

           DndTest test = new DndTest();
           test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           test.setSize(800, 600);

           test.setLocationRelativeTo(null);
           test.setVisible(true);
        }
    });
 }
}
===================DndTest.java ends========================
==================JSequencePanel.java starts================

package juhan.exer.dnd;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;

/**
 *
 * @author juhshen
 */
public class JSequencePanel extends JPanel {

    private List<Clazz> moduleList = new ArrayList();

    public JSequencePanel() {
        super();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        for(int i=0;i<moduleList.size();i++){
            moduleList.get(i).paint(g);
        }
     
    }

    public void addClass(Clazz clazz){
        clazz.setFocusable(true);
        moduleList.add(clazz);
        this.add(clazz);
    }

}
================JSequencePanel.java ends============
==============Clazz.jva starts=====================
package juhan.exer.dnd;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import javax.swing.JComponent;

/**
 *
 * @author juhshen
 */
class Clazz extends JComponent{

  private static final int defaultRectWidth = 30;
  private static final int defaultRectHeight = 30;
  private static final int defaultLineLength = 80;
  private Point center = new Point(50,50);

  public Clazz(){
     super();
  }

  @Override
  protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Point rectLT =new Point();
        Point lineTop = new Point();
        Point lineBottom = new Point();
        CalculatePoints(rectLT,lineTop,lineBottom,center);

        
        Point testX = new Point(120,0);
        Point testY = new Point(130,130);

        Graphics2D g2 = (Graphics2D)g;
//        g2.setPaint(Color.BLUE);
//        g2.drawLine(testX.x, testX.y, testY.x, testY.y);
        g2.drawRect(rectLT.x,rectLT.y,defaultRectWidth,defaultRectHeight);
        g2.drawLine(lineTop.x, lineTop.y, lineBottom.x, lineBottom.y);


  }

    private void CalculatePoints(Point rectLT,Point lineTop,
                                 Point lineBottom, Point center) {

        rectLT.x=center.x-defaultRectWidth/2;
        rectLT.y=center.y-defaultRectHeight/2;

        lineTop.x=center.x;
        lineTop.y=center.y+defaultRectHeight/2;

        lineBottom.x = center.x;
        lineBottom.y = center.y+defaultRectHeight/2+defaultLineLength;
    }

  
}
======================Clazz.java ends=====================================
=======================Code ends=====================================

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============DndTest.java===========

package juhan.exer.dnd;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/**
 *
 * @author juhshen
 */
public class DndTest extends JFrame {
    private JDesktopPane dp = new JDesktopPane();
    private JSequencePanel sequenceDiagram = new JSequencePanel();

public DndTest(){
    super("Dnd Test");
    init();
}

private void init() {
   setJMenuBar(createDummyMenuBar());
   getContentPane().add(createDummyToolBar(), BorderLayout.NORTH);

   JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, 
                                                          dp, sequenceDiagram);
   sp.setDividerLocation(120);
   getContentPane().add(sp);
   sequenceDiagram.addClass(new Clazz());
 
   
}

private JToolBar createDummyToolBar() {
        JToolBar tb = new JToolBar();
        JButton b;
        b = new JButton("New");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Open");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Save");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Print");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        b = new JButton("Preview");
        b.setRequestFocusEnabled(false);
        tb.add(b);
        tb.setFloatable(false);
        return tb;
    }

    private JMenuBar createDummyMenuBar() {
        JMenuBar mb = new JMenuBar();
        mb.add(createDummyMenu("File"));
        mb.add(createDummyMenu("Edit"));
        mb.add(createDummyMenu("Search"));
        mb.add(createDummyMenu("View"));
        mb.add(createDummyMenu("Tools"));
        mb.add(createDummyMenu("Help"));

        JMenu demo = new JMenu("Demo");
        demo.setMnemonic(KeyEvent.VK_D);
        mb.add(demo);

        return mb;
    }

    private JMenu createDummyMenu(String str) {
        JMenu menu = new JMenu(str);
        JMenuItem item = new JMenuItem("[Empty]");
        item.setEnabled(false);
        menu.add(item);
        return menu;
    }

 public static void main(final String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
       public void run() {
                //Turn off metal's use of bold fonts
	   UIManager.put("swing.boldMetal", Boolean.FALSE);
           createAndShowGUI(args);
       }

       private void createAndShowGUI(String[] args) {
           try {
              UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
           } catch (Exception e) {
           }

           DndTest test = new DndTest();
           test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           test.setSize(800, 600);

           test.setLocationRelativeTo(null);
           test.setVisible(true);
        }
    });
 }
}
===================DndTest.java ends========================
==================JSequencePanel.java starts================

package juhan.exer.dnd;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;

/**
 *
 * @author juhshen
 */
public class JSequencePanel extends JPanel {

    private List<Clazz> moduleList = new ArrayList();

    public JSequencePanel() {
        super();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        for(int i=0;i<moduleList.size();i++){
            moduleList.get(i).paint(g);
        }
     
    }

    public void addClass(Clazz clazz){
        clazz.setFocusable(true);
        moduleList.add(clazz);
        this.add(clazz);
    }

}
================JSequencePanel.java ends============
==============Clazz.jva starts=====================
package juhan.exer.dnd;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import javax.swing.JComponent;

/**
 *
 * @author juhshen
 */
class Clazz extends JComponent{

  private static final int defaultRectWidth = 30;
  private static final int defaultRectHeight = 30;
  private static final int defaultLineLength = 80;
  private Point center = new Point(50,50);

  public Clazz(){
     super();
  }

  @Override
  protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Point rectLT =new Point();
        Point lineTop = new Point();
        Point lineBottom = new Point();
        CalculatePoints(rectLT,lineTop,lineBottom,center);

        
        Point testX = new Point(120,0);
        Point testY = new Point(130,130);

        Graphics2D g2 = (Graphics2D)g;
//        g2.setPaint(Color.BLUE);
//        g2.drawLine(testX.x, testX.y, testY.x, testY.y);
        g2.drawRect(rectLT.x,rectLT.y,defaultRectWidth,defaultRectHeight);
        g2.drawLine(lineTop.x, lineTop.y, lineBottom.x, lineBottom.y);


  }

    private void CalculatePoints(Point rectLT,Point lineTop,
                                 Point lineBottom, Point center) {

        rectLT.x=center.x-defaultRectWidth/2;
        rectLT.y=center.y-defaultRectHeight/2;

        lineTop.x=center.x;
        lineTop.y=center.y+defaultRectHeight/2;

        lineBottom.x = center.x;
        lineBottom.y = center.y+defaultRectHeight/2+defaultLineLength;
    }

  
}
======================Clazz.java ends=====================================
=======================Code ends=====================================

Answer : Java Gui, customized object focus and resize

Check out Joe Hertvik's excellent article:

http://www.itjungle.com/tfh/tfh093002-story04.html

If interactive users are prohibited to be on the system during end of day, you might consider simply ending the interactive subsystem(s) before starting end of day processing, and re-starting it afterward.  Operators will still be able to log onto the console and any other workstation configured to activate in QCTL.

ENDSBS QINTER *IMMED
STRSBS QINTER

- Gary Patterson
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