A simple Bean which extends JLabel : JLabel « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JLabel

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.Serializable;

import javax.swing.JLabel;

public class Colors extends JLabel implements Serializable {
  transient private Color color; // not persistent

  private boolean rectangular; // is persistent

  public Colors() {
    addMouseListener(new MouseAdapter() {
      public void mousePressed(MouseEvent me) {
        change();
      }
    });
    rectangular = false;
    setSize(200, 100);
    change();
  }

  public boolean getRectangular() {
    return rectangular;
  }

  public void setRectangular(boolean flag) {
    this.rectangular = flag;
    repaint();
  }

  public void change() {
    color = randomColor();
    repaint();
  }

  private Color randomColor() {
    int r = (int) (255 * Math.random());
    int g = (int) (255 * Math.random());
    int b = (int) (255 * Math.random());
    return new Color(r, g, b);
  }

  public void paint(Graphics g) {
    Dimension d = getSize();
    int h = d.height;
    int w = d.width;
    g.setColor(color);
    if (rectangular) {
      g.fillRect(0, 0, w - 1, h - 1);
    } else {
      g.fillOval(0, 0, w - 1, h - 1);
    }
  }
}

14.3.JLabel
	14.3.1.	JLabel
	14.3.2.	Create JLabel component
	14.3.3.	Create a JLabel with an image icon
	14.3.4.	JLabel is for displaying text, images or both. It does not react to input events.
	14.3.5.	Horizontal Alignment: CENTER
	14.3.6.	Vertical Alignment: CENTER
	14.3.7.	Horizontal Alignment: LEFT
	14.3.8.	Vertical Alignment: TOP
	14.3.9.	Horizontal Alignment: RIGHT
	14.3.10.	Vertical Alignment: BOTTOM
	14.3.11.	The text is horizontally and vertically centered
	14.3.12.	The text is right-justified and vertically centered
	14.3.13.	The text is left-justified and top-aligned
	14.3.14.	The text is right-justified and top-aligned
	14.3.15.	The text is left-justified and bottom-aligned
	14.3.16.	The text is right-justified and bottom-aligned
	14.3.17.	Add Icon to JLabel
	14.3.18.	Mix Icon and text in JLabel
	14.3.19.	Set Font and foreground color for a JLabel
	14.3.20.	Load image from disk file and add it to a JLabel
	14.3.21.	Using JLabel Mnemonics: Interconnect a specific JLabel and JTextField.
	14.3.22.	Using a JLabel and pass in HTML for the text
	14.3.23.	Multiline label (HTML)
	14.3.24.	JLabel with more than one row
	14.3.25.	A simple Bean which extends JLabel
	14.3.26.	Add JLabel to JScrollPane
	14.3.27.	Disable a label
	14.3.28.	Unicode with Label
	14.3.29.	Customizing a JLabel Look and Feel
	14.3.30.	Associate JLabel component with a JTextField
	14.3.31.	Setting the Focus of a JTextField Component Using a JLabel Component
	14.3.32.	JLabel with lined border
	14.3.33.	A Label that uses inline HTML to format its text
	14.3.34.	A label with no indication it has been clicked
	14.3.35.	Adding Drag-and-Drop Support to a JLabel Component
	14.3.36.	Have a Label with underlined text
	14.3.37.	Multi Line Label
	14.3.38.	Vertical Label UI
	14.3.39.	Time panel shows the current time.
	14.3.40.	URL Label
	14.3.41.	Hyperlink Label
	14.3.42.	Gradient Label