Problem with checkboxes

[carl]

Hi, Here's a program I'm trying to write that uses checkboxes. But when I compile it, it doesn't work. Can anyone please point out any errors they see in the code?

import java.applet.Applet.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JApplet implements ActionListener
{
String companyName = new String("Event Handlers, Inc");
Font bigFont = new Font("Arial", Font.PLAIN, 24);
JCheckBox cocktailBox = new JCheckBox("Cocktails");
JCheckBox dinnerBox = new JCheckBox("Dinner");
int cocktailPrice = 300, dinnerPrice = 600, totalPrice = 200;

public void init()
{
add(cocktailBox);
cocktailBox.addActionListener(this);
add(dinnerBox);
dinnerBox.addActionListener(this);
}

public void paint(Graphics gr)
{
gr.setFont(bigFont);
gr.setColor(Color.magenta);
gr.drawString(companyName, 10, 100);
gr.drawString("Event Price Estimate", 10, 150);
gr.setColor(Color.blue);
gr.drawString(Integer.toString(totalPrice), 280, 150);
}

public void itemStateChanged(ActionEvent check)
{
totalPrice = 200;
if(cocktailBox.getState())
{
totalPrice += cocktailPrice;
}
if(dinnerBox.getState())
{
totalPrice += dinnerPrice;
}
repaint();
}
}

Thanks.

[hardwired]

C:\jexp>javac compiletest.java
compiletest.java:7: CompileTest is not abstract and does not override abstract m
ethod actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListen
er
public class CompileTest extends JApplet implements ActionListener
       ^
compiletest.java:36: cannot find symbol
symbol  : method getState()
location: class javax.swing.JCheckBox
        if(cocktailBox.getState())
                      ^
compiletest.java:40: cannot find symbol
symbol  : method getState()
location: class javax.swing.JCheckBox
        if(dinnerBox.getState())
                    ^
3 errors

1 — The class signature implements ActionListener. The rule/contract with interfaces is this: if you implement an interface you promise to provide an implementation for each method it defines. Look up the ActionListener interface in the javadocs and find its only method is

public void actionPerformed(ActionEvent e) { }

This exact method signature must appear in the class that implements the ActionListener interface.
2 — getState is in the java.awt.Checkbox class api.
You are using a javax.swing.JCheckBox, a very different component. For this class you would use the isSelected method which JCheckBox inherits from its superclass AbstractButton - see JCheckBox api.

This method signature is incorrect.

    public void itemStateChanged(ActionEvent check)

The itemStateChanged method is defined by the ItemListener interface and its argument is an ItemEvent.