Listing 7.1  A Typical Implementation of the Interface Icon (// TestIcon.java)
// Shows a class that implements the Icon interface

import javax.swing.Icon;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Component;

class TestIcon implements Icon {
    int width = 20; // set to some default size
    int height = 20; // set to some default size
   
    // Constructor without any arguments
    public TestIcon() {
    }

    // Constructor to specify the icons width and height
    public TestIcon(int width, int height) {
        this.width = width;
        this.height = height;
    }

    // Paint the picture
    public void paintIcon(Component c,
                          Graphics g,
                          int x,
                          int y) {
        g.setColor(Color.red);
        g.fillOval(x, y, width, height);
        g.setColor(Color.gray);
        g.drawOval(x, y, width, height);
    }

    // To retrieve the icon width
    public int getIconWidth() {
        return width;
    }

    // To retrieve the icon height
    public int getIconHeight() {
        return height;
    }
}


Listing 7.2  JLabel with Labels, Icons, and Constants (TJLabel.java)
// Demonstrates the Swing labels, icons, and constants.
/*
 *<Applet code=TJLabel width=400 height=200>
 *</Applet>
 */

import java.awt.*;
import javax.swing.*;
public class TJLabel extends JApplet {
    Container container = null;
    Icon icon = new ImageIcon("metal.gif");

    public void init() {
        //1. Get a handle on the JApplet's content pane.
        container = getContentPane();

        //2. Create grid layout and set it for the applet and
        //assign a new background color.
        GridLayout grid = new GridLayout(3,3,5,5);
        container.setLayout(grid);
        container.setBackground(Color.gray);

        //3. Invoke the setLabel() method to create and add
        // labels with suitable text and icon positions.
        setLabel(JLabel.LEFT, JLabel.TOP);
        setLabel(JLabel.CENTER, JLabel.TOP);
        setLabel(JLabel.RIGHT, JLabel.TOP);

        setLabel(JLabel.LEFT, JLabel.CENTER);
        setLabel(JLabel.CENTER, JLabel.CENTER);
        setLabel(JLabel.RIGHT, JLabel.CENTER);

        setLabel(JLabel.LEFT, JLabel.BOTTOM);
        setLabel(JLabel.CENTER, JLabel.BOTTOM);
        setLabel(JLabel.RIGHT, JLabel.BOTTOM);
    }

    //4. Create and add labels to the Swing applet.
    public void setLabel(int horizPos, int vertPos) {
        JLabel label = new JLabel("Java",JLabel.CENTER);
        label.setIcon(icon); // Display Java Duke on the label
        label.setHorizontalTextPosition(horizPos);
        label.setVerticalTextPosition(vertPos);
        // Assign new background and foreground colors
        label.setBackground(Color.white);
        label.setForeground(Color.black);
        label.setOpaque(true); // label should not be transparent
        container.add(label);
    }
}


Listing 7.3  Borders Applet Creates One of Every Type of Border (TBorder1.java)
/*
 * <Applet code=TBorder1 width=400 height=200>
 * </Applet>
 */

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

public class TBorder1 extends JApplet{
    public void init() {
        // 1. Create an object of panel to contain a label
        // and add it to the applet's content pane.
        LabelPanel panel = new LabelPanel();
        getContentPane().add(panel);
    }
}

// 2. Panel that contains labels with borders.
class LabelPanel extends JPanel {
    Border border;
    JLabel label;

    public LabelPanel() {
        // 3. Assign grid layout (with 3 rows, 4 columns, and
        // 5 pixel horizontal and vertical spacing) to panel. 
        setLayout(new GridLayout(3,4,5,5));

        // 4. Create a label with an empty border.
        label = new JLabel("Empty", JLabel.CENTER);
        label.setOpaque(true);
        // Create an empty border object with the specified insets:
        // top = 1; left = 1; bottom = 1; right =1.
        border = new EmptyBorder(1,1,1,1);
        // Assign the border to the label.
        label.setBorder(border);
        add(label);

        // 5. Create a label with an etched border.
        label = new JLabel("Etched", JLabel.CENTER);
        label.setOpaque(true);
        // Create a raised and etched border.
        border = new EtchedBorder(EtchedBorder.RAISED);
        label.setBorder(border);
        add(label);

        // 6. Create a label with an etched border with color.
        label = new JLabel("Etched&Colored", JLabel.CENTER);
        label.setOpaque(true);
        border = new EtchedBorder(EtchedBorder.LOWERED, // Lowered and etched type
                                  Color.red, Color.blue); // Hightlight and shadow colors
        label.setBorder(border);
        add(label);

        // 7. Create a label with a bevel border.
        label = new JLabel("Bevel Up", JLabel.CENTER);
        label.setOpaque(true);
        border = new BevelBorder(BevelBorder.RAISED); // Raised bevel type
        label.setBorder(border);
        add(label);

        // 8. Create a label with a lowered bevel border.
        label = new JLabel("Bevel Down", JLabel.CENTER);
        label.setOpaque(true);
        border = new BevelBorder(BevelBorder.LOWERED); // Lowered bevel type
        label.setBorder(border);
        add(label);

        // 9. Create a label with a raised bevel border.
        label = new JLabel("ColoredBevel", JLabel.CENTER);
        label.setOpaque(true);
        border = new BevelBorder(BevelBorder.RAISED, // Raised bevel type
                                 Color.gray, Color.yellow); // Hightlight aand shadow colors
        label.setBorder(border);
        add(label);

        // 10. Create a label with a soft bevel border.
        label = new JLabel("SoftBevel", JLabel.CENTER);
        label.setOpaque(true);
        // Create a lowered bevel type border object with softened corners
        // without pointings
        border = new SoftBevelBorder(BevelBorder.LOWERED);
        label.setBorder(border);
        add(label);

        // 11. Create a label with a matte border.
        label = new JLabel("Matte", JLabel.CENTER);
        label.setOpaque(true);
        Icon icon = new ImageIcon("cube.gif");
        // Create a matte border object with the specified insets of
        // top = 20, left = 20, bottom = 20; right = 20 and matte icon
        border = new MatteBorder(20,20,20,20, icon );
        label.setBorder(border);
        add(label);

        // 12. Create a label with a red line border.
        label = new JLabel("Line", JLabel.CENTER);
        label.setOpaque(true);
        border = new LineBorder(Color.red, // Line color = red
                                5); // line thickness = 5.
        label.setBorder(border);
        add(label);

        // 13. Create a label with a gray line border.
        label = new JLabel("Line", JLabel.CENTER);
        label.setOpaque(true);
        // Create a line border with gray color and thickness = 1.
        border = LineBorder.createGrayLineBorder();
        label.setBorder(border);
        add(label);

        // 14. Create a label with a compound border.
        label = new JLabel("Compound", JLabel.CENTER);
        label.setOpaque(true);
        // Create a compound border with a raised bevel border and a raised 
        // etched border
        border = new CompoundBorder(
                   new BevelBorder(BevelBorder.RAISED),
                   new EtchedBorder(EtchedBorder.RAISED));
        label.setBorder(border);
        add(label);

        // 15. Create a label with a titled border with specified
        // border.
        label = new JLabel("Titled", JLabel.CENTER);
        label.setOpaque(true);
        border = new TitledBorder(new LineBorder(Color.red),
                                  "Lined&Titled", // Display title.
                                  TitledBorder.DEFAULT_JUSTIFICATION, 
// Title justification.
                                  TitledBorder.CENTER, // Title location.
                                  new Font("Sans", Font.BOLD, 16), // Title font.
                                  Color.blue); // Title color.
        label.setBorder(border);
        add(label);

    }
}

Listing 7.4  Custom Borders (TBorder2.java)
/*
 * <Applet code=TBorder2 width=300 height=150>
 * </Applet>
 */

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

public class TBorder2 extends JApplet {
    public void init() {

        // 1. Get a handle on the applet's content pane.
        // and set the grid layout.
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(2,3)); // 2 rows and 3 columns.

        // 2. Add labels to the applet with decorating
        //    borders created from the class SimpleBorder.

        // 2(a) Create an array of favorite colors.
        Color[] colors = {Color.lightGray, Color.yellow,
                          Color.green, Color.white,
                          Color.blue, Color.red};
        // 2(b) Create labels and add them to the container.
        for (int i=0; i<6; i++) { // Total number of labels = 6.
           JLabel label = new JLabel("Label"+(i+1), JLabel.CENTER);
           label.setOpaque(true);
           container.add(label);
           label.setBorder(new SimpleBorder(15, // Top inset.
                                            15, // Left inset.
                                            15, // Right inset.
                                            15, // Bottom inset. 
                                    colors[i])); // border color
        }
    }
}

// 3. Define the custom border class called SimpleBorder.
class SimpleBorder implements Border {
    int top;
    int left;
    int bottom;
    int right;
    Color color = null;

    public SimpleBorder(int top, int left, int bottom,
                             int right, Color color) {
        this.top = top;
        this.left = left;
        this.bottom = bottom;
        this.right = right;
        this.color = color;
    }

    public void paintBorder(Component c, // Component that will contain the border.
                            Graphics g,  // Graphics context.
                            int x, int y, // x and y coordinates of the painted border.
                            int width, int height) { // Border width and height.

        // Create insets around the component to draw the border.
        Insets insets = getBorderInsets(c);

        // Set the border color.
        if (color != null)
            g.setColor(color);

        // Prepare the border by using 3D Rectangles returned by the method.
        // g.fill3Drect(). This method takes the argument values as following:
        g.fill3DRect(0, // x-coordinate 
                     0, // y-coordinate
                     width-insets.right, // width
                     insets.top, // height.
                     true); // Rectangle appears to be raised.
        // The following methods also work with the arguments as shown in the 
        // previous method call. 
        g.fill3DRect(0, insets.top, insets.left,
                        height-insets.top, true);
        g.fill3DRect(insets.left, height-insets.bottom,
                     width-insets.left, insets.bottom, true);
        g.fill3DRect(width-insets.right, 0, insets.right,
                     height-insets.bottom, true);
    }

    public Insets getBorderInsets(Component c) {
        return new Insets(top, left, bottom, right);
    }

    public boolean isBorderOpaque() {
        return true;
    }
}