Embedded Files
Example 9.3/* Exercise 9.3: Change the example program given in the previous parts to NOT display to System.out,
but to somewhere in the JFrame (for the display selected button, easier to use a JTextArea).
In itemStateChanged, display either in the JFrame or in a pop-up window (suggested to try JOptionPane's static method, showMessageDialog).
*/
import javax.swing.JFrame;
public class Exercise_9_3_TryGUIExample
{
public static void main(String[] args)
{
String [] strs = {"Name", "Company", "Email Address", "Phone"};
Exercise_9_3_GUIExample gui = new Exercise_9_3_GUIExample(strs);
gui.setSize(400,300);
gui.setVisible(true);
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
Example 9.4
/* Exercise 9.4: Re-do the Java application programs given in Chapter 9, Part I (TryCheckBoxes or FrameProgram ) as awt Applets or swing JApplets
that display in a GUI window. Run this by choosing a run configuration for Applets.
To capture the output, type [Alt]-[PrintScreen], then paste in a Word document.
*/
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Exercise_9_4_TryCheckBoxes_Applets extends JApplet implements ActionListener
{
private JCheckBox chBoxA, chBoxB, chBoxC, chBoxD;
private JLabel labelA, labelB, labelC, labelD;
public void init()
{
setLayout(new FlowLayout()); // UPDATED!
chBoxA = new JCheckBox("A");
chBoxB = new JCheckBox("B");
chBoxC = new JCheckBox("C");
chBoxD = new JCheckBox("D");
chBoxA.addItemListener(new CheckBoxAHandler());
chBoxB.addItemListener(new CheckBoxBHandler());
chBoxC.addItemListener(new CheckBoxCHandler());
chBoxD.addItemListener(new CheckBoxDHandler());
labelA = new JLabel("A is ON "); labelA.setVisible(false);
labelB = new JLabel("B is ON "); labelB.setVisible(false);
labelC = new JLabel("C is ON "); labelC.setVisible(false);
labelD = new JLabel("D is ON "); labelD.setVisible(false);
add(chBoxA);
add(chBoxB);
add(chBoxC);
add(chBoxD);
add(labelA);
add(labelB);
add(labelC);
add(labelD);
} // end init
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if(source == (Object) chBoxA)
labelA.setVisible(chBoxA.isSelected());
else if( source == (Object) chBoxA )
labelB.setVisible(chBoxA.isSelected());
} // end actionPerformed
// inner classes for listener classes
class CheckBoxAHandler implements ItemListener
{
public void itemStateChanged( ItemEvent e )
{
if( chBoxA.isSelected() ) // One way to check if selected
labelA.setVisible(true);
else
labelA.setVisible(false);
} // end itemStateChanged for check box A
} // end CheckBoxAHandler listener class
class CheckBoxBHandler implements ItemListener
{
public void itemStateChanged( ItemEvent e )
{
if( e.getStateChange() == ItemEvent.SELECTED ) // another way to check if selected
labelB.setVisible(true);
else
labelB.setVisible(false);
} // end itemStateChanged for check box B
} // end CheckBoxBHandler listener class
class CheckBoxCHandler implements ItemListener
{
public void itemStateChanged( ItemEvent e )
{
labelC.setVisible(chBoxC.isSelected()); // BEST WAY
} // end itemStateChanged for check box C
} // end CheckBoxCHandler listener class
class CheckBoxDHandler implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
labelD.setVisible(chBoxD.isSelected());
}
}
}
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