import javax.swing.*;import java.awt.*;import java.awt.font.*;import java.awt.geom.*;public class SizeDisplayer extends JComponent {    private Icon icon;    private String text;    private int xTextPad = 5;    private int yTextPad = 5;    //Reuse textSizeD and textSizeR to avoid creating    //lots of unnecessary Dimensions and Rectangles.    private Rectangle textSizeR = new Rectangle();    private Dimension textSizeD = new Dimension();        private Dimension userPreferredSize, //null                      userMinimumSize,   //null                      userMaximumSize;   //null        public SizeDisplayer(String text, Icon icon) {        this.text = text;        this.icon = icon;        setOpaque(true);    }        protected void paintComponent(Graphics g) {        Graphics2D g2d = (Graphics2D)g.create(); //copy g        Dimension minSize = getMinimumSize();        Dimension prefSize = getPreferredSize();        Dimension size = getSize();        int prefX = 0, prefY = 0;        //Set hints so text looks nice.        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,                             RenderingHints.VALUE_ANTIALIAS_ON);        g2d.setRenderingHint(RenderingHints.KEY_RENDERING,                             RenderingHints.VALUE_RENDER_QUALITY);                                     //Draw the maximum size rectangle if we're opaque.        if (isOpaque()) {            g2d.setColor(getBackground());            g2d.fillRect(0, 0, size.width, size.height);        }                //Draw the icon.        if (icon != null) {            Composite oldComposite = g2d.getComposite();            g2d.setComposite(AlphaComposite.getInstance(                                      AlphaComposite.SRC_OVER,                                      0.1f));            icon.paintIcon(this, g2d,                           (size.width - icon.getIconWidth())/2,                           (size.height - icon.getIconHeight())/2);            g2d.setComposite(oldComposite);        }                        //Draw the preferred size rectangle.        prefX = (size.width - prefSize.width)/2;        prefY = (size.height - prefSize.height)/2;        g2d.setColor(Color.RED);        g2d.drawRect(prefX, prefY, prefSize.width - 1, prefSize.height - 1);        //Draw the minimum size rectangle.        if (minSize.width != prefSize.width || minSize.height != prefSize.height) {            int minX = (size.width - minSize.width)/2;            int minY = (size.height - minSize.height)/2;            g2d.setColor(Color.CYAN);            g2d.drawRect(minX, minY, minSize.width - 1, minSize.height - 1);        }                //Draw the text.        if (text != null) {            Dimension textSize = getTextSize(g2d);            g2d.setColor(getForeground());            g2d.drawString(text,                           (size.width - textSize.width)/2,                           (size.height - textSize.height)/2                            + g2d.getFontMetrics().getAscent());        }        g2d.dispose();    }            private Dimension getTextSize(Graphics2D g2d) {        if (text == null) {            textSizeD.setSize(0,0);        } else {            FontRenderContext frc;            if (g2d != null) {                frc = g2d.getFontRenderContext();            } else {                frc = new FontRenderContext(null, false, false);            }            Rectangle2D textRect = getFont().getStringBounds(                                              text,                                              frc);            textSizeR.setRect(textRect);            textSizeD.setSize(textSizeR.width, textSizeR.height);        }                return textSizeD;    }            public Dimension getMinimumSize() {        if (userMinimumSize != null) { //user has set the min size            return userMinimumSize;        } else {            return getPreferredSize();        }    }        public Dimension getPreferredSize() {        if (userPreferredSize != null) { //user has set the pref size            return userPreferredSize;        } else {            return calculatePreferredSize();        }    }        public Dimension getMaximumSize() {        if (userMaximumSize != null) { //user has set the max size            return userMaximumSize;        } else {            return new Dimension(Integer.MAX_VALUE,                                 Integer.MAX_VALUE);        }    }        public void setMinimumSize(Dimension newSize) {        userMinimumSize = newSize;    }    public void setPreferredSize(Dimension newSize) {        userPreferredSize = newSize;    }    public void setMaximumSize(Dimension newSize) {        userMaximumSize = newSize;    }        private Dimension calculatePreferredSize() {        Insets insets = getInsets();        Dimension textSize = getTextSize(null);        int iconWidth = 0;        int iconHeight = 0;                if (icon != null) {            iconWidth = icon.getIconWidth();            iconHeight = icon.getIconHeight();        }        return new Dimension(                Math.max(iconWidth, textSize.width + 2*xTextPad)                + insets.left + insets.right,                Math.max(iconHeight, textSize.height + 2*yTextPad)                + insets.top + insets.bottom);    }}