Source Code : Customized component

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Customized component

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.Customizer;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Calendar;
import java.util.Date;

import javax.swing.JButton;
import javax.swing.JFrame;

public class Clock extends JButton implements Customizer, Externalizable,
    Runnable {

  protected PropertyChangeSupport propertyChangeSupport;

  protected boolean isDigital = false;

  protected Calendar calendar = Calendar.getInstance();

  public Clock() {

    propertyChangeSupport = new PropertyChangeSupport(this);

    setBackground(Color.white);
    setForeground(Color.black);

    (new Thread(this)).start();
  }

  public void writeExternal(ObjectOutput out) throws IOException {
    out.writeBoolean(isDigital);
    out.writeObject(getBackground());
    out.writeObject(getForeground());
    out.writeObject(getPreferredSize());
  }

  public void readExternal(ObjectInput in) throws IOException,
      ClassNotFoundException {
    setDigital(in.readBoolean());
    setBackground((Color) in.readObject());
    setForeground((Color) in.readObject());
    setPreferredSize((Dimension) in.readObject());
  }

  public Dimension getPreferredSize() {
    return new Dimension(50, 50);
  }

  public Dimension getMinimumSize() {
    return getPreferredSize();
  }

  public Dimension getMaximumSize() {
    return getPreferredSize();
  }

  public void setDigital(boolean digital) {
    propertyChangeSupport.firePropertyChange("digital", new Boolean(
        isDigital), new Boolean(digital));
    isDigital = digital;
    repaint();
  }

  public boolean getDigital() {
    return isDigital;
  }

  public void addPropertyChangeListener(PropertyChangeListener lst) {
    if (propertyChangeSupport != null)
      propertyChangeSupport.addPropertyChangeListener(lst);
  }

  public void removePropertyChangeListener(PropertyChangeListener lst) {
    if (propertyChangeSupport != null)
      propertyChangeSupport.removePropertyChangeListener(lst);
  }

  public void setObject(Object bean) {
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Color colorRetainer = g.getColor();

    g.setColor(getBackground());
    g.fillRect(0, 0, getWidth(), getHeight());
    getBorder().paintBorder(this, g, 0, 0, getWidth(), getHeight());

    calendar.setTime(new Date()); // get current time
    int hrs = calendar.get(Calendar.HOUR_OF_DAY);
    int min = calendar.get(Calendar.MINUTE);

    g.setColor(getForeground());
    if (isDigital) {
      String time = "" + hrs + ":" + min;
      g.setFont(getFont());
      FontMetrics fm = g.getFontMetrics();
      int y = (getHeight() + fm.getAscent()) / 2;
      int x = (getWidth() - fm.stringWidth(time)) / 2;
      g.drawString(time, x, y);
    } else {
      int x = getWidth() / 2;
      int y = getHeight() / 2;
      int rh = getHeight() / 4;
      int rm = getHeight() / 3;

      double ah = ((double) hrs + min / 60.0) / 6.0 * Math.PI;
      double am = min / 30.0 * Math.PI;

      g.drawLine(x, y, (int) (x + rh * Math.sin(ah)), (int) (y - rh
          * Math.cos(ah)));
      g.drawLine(x, y, (int) (x + rm * Math.sin(am)), (int) (y - rm
          * Math.cos(am)));
    }

    g.setColor(colorRetainer);
  }

  public void run() {
    while (true) {
      repaint();
      try {
        Thread.sleep(30 * 1000);
      } catch (InterruptedException ex) {
        break;
      }
    }
  }

  public static void main(String[] a) {
    JFrame f = new JFrame();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    Clock c = new Clock();
    f.getContentPane().add("Center", c);
    f.pack();
    f.setSize(new Dimension(300, 300));
    f.show();

  }
}


           
       

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