List Box interface, gotta be something simple [Archive]

tools

10-05-2010, 11:38 AM

This code is almost done but I am messing up the interface with the listbox portion, can someone review and point me in the right direction?

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;

/********************************************/
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
import javax.swing.Jlist;

/****************************************/

public class HoursCalc extends JApplet implements ActionListener {

/*****************************************/
{
// Instance attributes used in this example
private JPanel topPanel = new;
private JList listbox = new;

// Constructor of main frame
public ListExample()
{
// Set the frame characteristics
setTitle( "Simple ListBox Application" );
setSize( 300, 100 );
setBackground( Color.gray );

// Create a panel to hold all other components
topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
getContentPane().add( topPanel );

// Create some items to add to the list
String listData[] =
{
"Item 1",
"Item 2",
"Item 3",
"Item 4"
};

// Create a new listbox control
listbox = new JList( listData );
topPanel.add( listbox, BorderLayout.CENTER );
}

// Main entry point for this example
public static void main( String args[] )
{
// Create an instance of the test application
ListExample mainFrame = new ListExample();
mainFrame.setVisible( true );
}
}
/*******************************************/

/**
* Initialization method that will be called after the applet is loaded
* into the browser.
*/
public void init() {
//Execute a job on the event-dispatching thread:
//creating this applet's GUI.
try {
javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
createGUI();
}
});
} catch (Exception e) {
System.err.println("createGUI didn't successfully complete");
}
}

private JLabel labelName = null;
private JTextField fldName = null;
private JLabel labelHours = null;
private JTextField fldHours = null;
private JLabel labelRate = null;
private JTextField fldRate = null;
private JTextField fldPay = null;
private JTextField fldMessage = null;

private void createGUI() {
this.setLayout(new GridLayout(0,2));
labelName = new JLabel("Name");
getContentPane().add(labelName);

fldName = new JTextField();
getContentPane().add(fldName);

labelRate = new JLabel("Rate");
getContentPane().add(labelRate);

fldRate = new JTextField("0.00");
getContentPane().add(fldRate);

labelHours = new JLabel("Hours");
getContentPane().add(labelHours);

fldHours = new JTextField("0.0");
getContentPane().add(fldHours);

// make the button
//
JButton butCalc = new JButton("Calc");
butCalc.setVisible(true);
getContentPane().add(butCalc);

fldPay = new JTextField();
getContentPane().add(fldPay);
fldPay.setEditable(false);

fldMessage = new JTextField();
getContentPane().add(fldMessage);
fldMessage.setEditable(false);

// action listener
//
butCalc.addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
double rate = 0.0;
double hours = 0.0;
try {
rate = Double.parseDouble(fldRate.getText());
hours = Double.parseDouble(fldHours.getText());

if (rate < 0.0 || hours < 0.0)
throw new NumberFormatException ();
if (rate > 150 | rate < 6.0 || hours > 60)
throw new NumberFormatException ();

double pay = rate * hours;
if (hours > 40.0)
pay += rate / 2.0 * (hours - 40.0);

fldMessage.setText("");
fldPay.setText(String.valueOf(pay));
}
catch (NumberFormatException exc)
{
fldMessage.setText("Please check numbers");
}
}
}