I am getting the error in the title of this post when I try to run my ColorFactory class. Can someone tell me where Im going wrong?
Heres my code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ColorFactory extends JFrame
{
//Fields of the class
private JLabel messageLabel; //A message to the user
private JPanel panelNorth; //A holding panel for the north border panel
private JPanel panelSouth; //A holding panel for the south border panel
private JPanel panelCenter; //A holding panel for the center border panel
private JButton redButton; //Changes panel color to red
private JButton orangeButton; //Changes panel color to orange
private JButton yellowButton; //Changes panel color to yellow
private JRadioButton greenRadioButton; //Changes text color to green
private JRadioButton blueRadioButton; //Changes text color to blue
private JRadioButton cyanRadioButton; //Changes text color to cyan
private final int WINDOW_WIDTH = 500; //Sets width of window
private final int WINDOW_HEIGHT = 300; //Sets height of window
/**
Constructor +ColorFactory()
*/
public ColorFactory()
{
//Set the title of the window to Color Factory.
setTitle("Color Factory");
//Set the size of the window using the constants 500 for window width and 300 for window height.
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
//Specify what happens when the close button is clicked.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Get the content pane of the JFrame and set the layout manager to border layout.
getContentPane().setLayout(new BorderLayout());
//Call the method buildNorthPanel to build the top panel.
buildNorthPanel();
//Add panelNorth to the north part of the content pane.
add(panelNorth, BorderLayout.NORTH);
//Call the method buildSouthPanel to build the bottom panel.
buildSouthPanel();
//Add panelSouth to the south part of the content pane.
add(panelSouth, BorderLayout.SOUTH);
//Create a label that contains the message “Top buttons change the panel color and
//bottom radio buttons change the text color.”
messageLabel = new JLabel("Top buttons change the panel color and bottom radio buttons change the text color.");
//Add this label to the center part of the content pane.
add(panelCenter, BorderLayout.CENTER);
//Use setVisible method to display window on screen.
setVisible(true);
}//end constructor
/*
The buildNorthPanel method creates a panel that contains three buttons, red, orange, and yellow in the top panel.
*/
private void buildNorthPanel()
{
//Create three buttons, red, orange, and yellow.
redButton = new JButton("Red");
orangeButton = new JButton("Orange");
yellowButton = new JButton("Yellow");
//Use flow layout for the panel.
setLayout(new FlowLayout());
//Set the background to be white.
panelNorth.setBackground(Color.WHITE);
//Display red, orange, and yellow buttons in their respective colors.
redButton.setBackground(Color.RED);
orangeButton.setBackground(Color.ORANGE);
yellowButton.setBackground(Color.YELLOW);
//Add button listener that implements action listener for each button.
redButton.addActionListener(new ButtonListener());
orangeButton.addActionListener(new ButtonListener());
yellowButton.addActionListener(new ButtonListener());
}//end buildNorthPanel method
/*
The buildSouthPanel method creates a panel that contains three radio buttons, green, blue, and cyan in the
bottom panel.
*/
private void buildSouthPanel()
{
//Create three buttons, green, blue, and cyan.
greenRadioButton = new JRadioButton("Green");
blueRadioButton = new JRadioButton("Blue");
cyanRadioButton = new JRadioButton("Cyan");
//Use flow layout for the panel.
setLayout(new FlowLayout());
//Set the background to be white.
panelSouth.setBackground(Color.WHITE);
//Display green, blue, and cyan radio buttons in their respective colors.
greenRadioButton.setBackground(Color.GREEN);
blueRadioButton.setBackground(Color.BLUE);
cyanRadioButton.setBackground(Color.CYAN);
//Add button listener that implements action listener for each radio button.
greenRadioButton.addActionListener(new RadioButtonListener());
blueRadioButton.addActionListener(new RadioButtonListener());
cyanRadioButton.addActionListener(new RadioButtonListener());
}//end buildSouthPanel method
/*
Write a private inner class called ButtonListener that implements ActionListener. It
should contain an actionPerformed method to handle the button events.
*/
private class ButtonListener implements ActionListener
{
//actionPerformed method to handle all button events for red, orange, and yellow buttons.
public void actionPerformed(ActionEvent e)
{
//Determine which button was clicked to change color of center panel to respective color.
if (e.getSource() == redButton)
panelCenter.setBackground(Color.RED);
else if (e.getSource() == orangeButton)
panelCenter.setBackground(Color.ORANGE);
else if (e.getSource() == yellowButton)
panelCenter.setBackground(Color.YELLOW);
}//end actionPerformed method
}//end ButtonListener inner class
/*
Write a private inner class called RadioButtonListener that implements ActionListener. It
should contain an actionPerformed method to handle the radio button events.
*/
private class RadioButtonListener implements ActionListener
{
//actionPerformed method to handle all radio button events for green, blue, and cyan buttons.
public void actionPerformed(ActionEvent e)
{
//Determine which radio button was clicked to change color of text in center panel to respective color.
if (e.getSource() == greenRadioButton)
panelCenter.setForeground(Color.GREEN);
else if (e.getSource() == blueRadioButton)
panelCenter.setForeground(Color.ORANGE);
else if (e.getSource() == cyanRadioButton)
panelCenter.setForeground(Color.YELLOW);
}//end actionPerformed method
}//end RadioButtonListener inner class
}//end classIn a separate driver file, I have this:
public class Good_Brandon_Lab_08 //MUST match the file name!
{
public static void main (String[ ] args)
{
//Identify Programmer, Class, and Program Number
System.out.println("Program results by Brandon Good for CSCI 2911-H.");
System.out.println("This program solves Lab Week 8.");
//Create instance of ColorFactory.
ColorFactory colors = new ColorFactory();
}//end main method
}//end classAny suggestions would be greatly appreciated!
