The source code for this example is as below and as in JPasswordFieldExample.java

/** Java Swing Examples - Written by Derek Molloy, Dublin City University, Ireland
 *  see: http://ee402.eeng.dcu.ie/ 
 */

package ee402;

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

@SuppressWarnings("serial")
public class JPasswordFieldExample extends JFrame implements ActionListener {        
        JLabel l1 = new JLabel("This is a Test Swing Application");
        JButton b1, b2;
        JPasswordField pwd;
        
        public JPasswordFieldExample()
        {
                super("JPassword Field Example");

                JPanel p = new JPanel();
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                p.setBorder(new TitledBorder("Enter Your Password:"));

                pwd = new JPasswordField(20);
                pwd.addActionListener(this);
        
                p.add(pwd);
                this.getContentPane().add(p);

                this.pack();        // set the size automatically
                this.setVisible(true);
        }
        
        public void actionPerformed(ActionEvent e)
        {
                if (e.getSource().equals(pwd))
                {
                        char[] thePassword = pwd.getPassword();
                        String s = new String(thePassword);
                        System.out.println("Password is " + s);
                }
        }
        
        public static void main(String[] args)
        {
                new JPasswordFieldExample();
        }
}

The JSlider component is a replacement for the Scrollbar AWT component. It is mentioned here, because there is quite a range of new functionality available with this component. For example if you look at the second JSlider object from the top (the middle one) in Figure 9.10, “A JSlider Example”, you will see that it has a title, tick marks for intervals. The code for this component is shown below:

                // Slider 2
                p = new JPanel();
                p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
                p.setBorder(new TitledBorder("Major Ticks"));
                s = new JSlider(100, 1000, 400);
                s.setPaintTicks(true);
                s.setMajorTickSpacing(100);
                s.getAccessibleContext().setAccessibleName("Major Ticks");
                s.getAccessibleContext().setAccessibleDescription("A slider showing major tick marks");
                //s.addChangeListener(this);
                p.add(s);
                hp.add(p);

A JPanel object is created for each JSlider object. The layout of this JPanel object is set to BoxLayout, which allows multiple components to be laid out either vertically or horizontally, without wrapping. In this case the components are laid out in BoxLayout.Y_AXIS allowing the components to be laid out vertically, and these components will remain vertical, even when the JFrame is resized. For a BoxLayout you also have to pass the container that you wish to lay out - in this case p. TitleBorder is another border that you can use, that places a title around the border frame - in this case "Major Ticks". The JSlider object is then created with a minimum of 100, a maximum of 1000, and an initial value of 400. The setPaintTicks() enables/disables the tick lines below the JSlider component. The setMajorTickSpacing(100) method call sets spacing to 100, so we will have 10 ticks in this case.

The next two lines demonstrate the Accessibility API (part of the JFCs) that sets the Accessible name of this component to "Major Ticks" and the description to "A slider showing major tick marks", so that if the user has a visual disability that speech synthesis software would be capable of identifying the reason for the component to allow that person to use it.

Figure 9.10. A JSlider Example

Other constructors that can be used with JSlider are:

The Full code for this example can be seen in JSliderExample.java

A JProgressBar component displays an Integer value within a bounded interval. A progress bar typically communicates the progress of an event by displaying its percentage of completion and possibly also provides a textual description. See Figure 9.11, “A JProgressBar Example” for a basic example.

Figure 9.11. A JProgressBar Example

The code for this is in JProgressBarExample.java There are several constructors for JProgressBar:

You can set the value of the progress bar by using the setValue(int) method and you can get the value by using the getValue() method.

The JToggleButton component is very similar to a checkbox, in that it can be selected or not selected. Figure 9.12, “The JToggleButton component example (a) selected (b) not selected.” shows a selected JToggleButton object and a non-selected component. It is very similar to the JButton class except that it can have two states.

Figure 9.12. The JToggleButton component example (a) selected (b) not selected.

The code for this example is in JToggleButtonExample.java There are several constructors for a JToggleButton:

If you wish to find the current state of the JToggleButton object using the isSelected() method that returns a boolean value.

Exercise. Write an Egg Timer

Figure 9.13. The Egg Timer Exercise