A Virtual Keyboard is considered to be a component to use on computers without a real keyboard e.g. Touch Screen Computers and Smart Phones; where a mouse can utilize the keyboard functionalities and features.
In addition, Virtual Keyboard used for the following subjects: Foreign Character Sets, Touchscreen, Bypass Key Loggers, etc.
5. Introduction to Virtual Keyboard
» A virtual keyboard is considered to be a
component to use on computers without a
real keyboard e.g.
˃ touch screen computer
» A mouse can utilize the keyboard
functionalities and features. 5
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6. Virtual Keyboard Usage
» It is possible to obtain keyboards for the
following specific purposes:
˃ Keyboards to fill specific forms on sites
˃ Special key arrangements
˃ Keyboards for dedicated commercial sites
˃ etc.
» In addition, Virtual Keyboard used for the
following subjects:
˃ Foreign Character Sets
˃ Touchscreens
˃ Bypass key loggers
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8. Exception Handling
» A program can be written assuming that nothing unusual or
incorrect will happen.
˃ The user will always enter an integer when prompted to do so.
˃ There will always be a nonempty list for a program that takes an entry from the list.
˃ The file containing the needed information will always exist.
» Unfortunately, it isn't always so.
» Once the core program is written for the usual, expected
case(s), Java's exception-handling facilities should be
added to accommodate the unusual, unexpected case(s).
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13. JToggleButton Class
» JToggleButton is an implementation of a two-state
button and is used to represent buttons that can be
toggled ON and OFF
» The JRadioButton and JCheckBox classes are
subclasses of this class.
» The events fired by JToggleButtons are slightly
different than those fired by JButton. 13
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14. JToggleButton Demo
» The following example on next slide demonstrates
a toggle button. Each time the toggle button is pressed,
its state is displayed in a label.
» Creating JToggleButton involves these steps:
1. Create an instance of JToggleButton.
2. Register an ItemListener to handle item events generated by the button.
3. To determine if the button is on or off, call isSelected().
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19. Java Robot Class
» This class is used to generate native
system input events for the
purposes of
˃ test automation
˃ self-running demos
˃ and other applications where control of the mouse
and keyboard is needed.
» This class has three main
functionalities:
˃ mouse control
˃ keyboard control
˃ and screen capture.
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20. Robot Class Demo
» Perform keyboard operation with help of java Robot class.
» The following example on next slide will demonstrate the
Robot class usage to handle the keyboard events.
» The program will write the word "OXUS20" inside the
TextArea automatically after running the program.
» The word "OXUS20" will be written character by character
with one second delay between each on of the
characters. 20
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21. Robot Class Demo
Source Code
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
public class RobotDemo extends JFrame {
public RobotDemo() {
// JFrame with TextArea Settings
setTitle("OXUS20 Robot Demo");
setSize(400, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
JTextArea txtOXUS = new JTextArea();
add(txtOXUS, BorderLayout.CENTER);
setVisible(true);
} 21
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22. public static void main(String[] args) {
new RobotDemo();
// Store Keystrokes "OXUS20" in an array
int keyInput[] = { KeyEvent.VK_O, KeyEvent.VK_X, KeyEvent.VK_U,
KeyEvent.VK_S, KeyEvent.VK_2, KeyEvent.VK_0 };
try {
Robot robot = new Robot();
// press the shift key
robot.keyPress(KeyEvent.VK_SHIFT);
// This types the word 'OXUS20' in the TextArea
for (int i = 0; i < keyInput.length; i++) {
if (i > 0) {
robot.keyRelease(KeyEvent.VK_SHIFT);
}
robot.keyPress(keyInput[i]);
// pause typing for one second
robot.delay(1000);
}
} catch (AWTException e) {
System.err.println("Exception is happening!");
}
} // end of main()
} // end of RobotDemo class 22
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24. Toolkit class
» Toolkit is an AWT class acting as a base class for all
implementations of AWT.
» This class offers a static method getDefaultToolkit() to return
a Toolkit object representing the default implementation of
AWT.
» You can use this default toolkit object to get information of the
default graphics device, the local screen, and other purposes.
» Next slide demonstrate an example finding out the actual size
and resolution of your screen. 24
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25. Toolkit Class Demo
Source Code
import java.awt.Dimension;
import java.awt.Toolkit;
public class ToolkitDemo {
public static void main(String[] a) {
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
System.out.println("Screen size: " + d.width + "x" + d.height);
System.out.println("nScreen Resolution: " +
tk.getScreenResolution());
}
}
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27. Another Toolkit Example
» Change the state of the Caps Lock key
˃ If Caps Lock key is ON turn it OFF
˃ Otherwise, if Caps Lock key is OFF turn it ON
» Toolkit.getDefaultToolkit().setLockingKeyState(
KeyEvent.VK_CAPS_LOCK, false);
˃ This line of code will change the state of the Caps Lock key OFF.
» Toolkit.getDefaultToolkit().setLockingKeyState(
KeyEvent.VK_CAPS_LOCK, true);
˃ This line of code will change the state of the Caps Lock key ON.
» Accordingly the keyboard LEDs flash will become
ON or OFF. 27
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