Thread: actionListner code doesn't work ????

hi everyone
I am still new at learning java language
and I use eclipse program
but when I run this code it doesn't work

the code is :

 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
public class coloredPanels extends JFrame implements ActionListener
{
 
	private int width = 300;
	private int height = 200;
 
	private JPanel greenPanel;
	private JPanel whitePanel;
	private JPanel grayPanel;
 
 
	public static void main(String[] args){
		coloredPanels gui =new coloredPanels();
		gui.setVisible(true);		
	}
 
 
	public coloredPanels()
	{
 
		//we created the frame of the GUI
	super("Panel for 3 colors");
	setSize(width,height);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setLayout(new BorderLayout());
 
	//we created the biggest panel that has the other panels of each colored bars
	JPanel biggerPanel = new JPanel();
	biggerPanel.setLayout(new GridLayout(1,3));
 
	//the first panel has created
	greenPanel  = new JPanel();
	greenPanel.setBackground(Color.LIGHT_GRAY);
	biggerPanel.add(greenPanel);
 
 
	//the second panel has created
	whitePanel  = new JPanel();
	whitePanel.setBackground(Color.LIGHT_GRAY);
	biggerPanel.add(whitePanel);
 
	//the third panel has created
	grayPanel  = new JPanel();
	grayPanel.setBackground(Color.LIGHT_GRAY);
	biggerPanel.add(grayPanel);
 
	//place the biggest panel with the 3 other panels at the center of the screen
	add(biggerPanel,BorderLayout.CENTER);
 
	//now we created panel for 3 buttons
	JPanel buttonPanel = new JPanel();
	buttonPanel.setBackground(Color.LIGHT_GRAY);
	buttonPanel.setLayout(new FlowLayout());
 
	JButton greenButton = new JButton("Green");
	greenButton.setBackground(Color.GREEN);
	greenButton.addActionlistner(this);
	buttonPanel.add(greenButton);
 
	JButton whiteButton = new JButton("White");
	whiteButton.setBackground(Color.WHITE);
	whiteButton.addActionlistner(this);
	buttonPanel.add(whiteButton);
 
 
	JButton grayButton = new JButton("Gray");
	grayButton.setBackground(Color.GRAY);
	grayButton.addActionlistner(this);
	buttonPanel.add(grayButton);
 
 
	add(buttonPanel,BorderLayout.NORTH);
	}
 
public void actionPerformed(ActionEvent e){
	String buttonText = e.getActionCommand();
 
	if(buttonText.equalsIgnoreCase("Green"))
		greenPanel.setBackground(Color.GREEN);
	else if(buttonText.equalsIgnoreCase("White"))
		whitePanel.setBackground(Color.WHITE);
	else if(buttonText.equalsIgnoreCase("Gray"))
		greenPanel.setBackground(Color.GRAY);
	else
		System.out.println("error");
}
 
}

and the errors are :
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The method addActionlistner(coloredPanels) is undefined for the type JButton
The method addActionlistner(coloredPanels) is undefined for the type JButton
The method addActionlistner(coloredPanels) is undefined for the type JButton

at coloredPanels.<init>(coloredPanels.java:67)
at coloredPanels.main(coloredPanels.java:23)


=======

if you plz help me

addActionlistner

check your spelling against the names of the methods in the API doc for JButton

Originally Posted by Sean4u

check your spelling against the names of the methods in the API doc for JButton

thank you
but how can I check them ??

but how can I check them ??

JButton (Java Platform SE 7 )
...copy...paste

addActionListener

Your post
...copy...paste

addActionlistner

...edit a bit to get one above the other...

addActionListener

addActionlistner

Compare the two strings of characters one-character-at-a-time, like a computer would. Are they the same?

Originally Posted by Sean4u

JButton (Java Platform SE 7 )
...copy...paste

Your post
...copy...paste

...edit a bit to get one above the other...



Compare the two strings of characters one-character-at-a-time, like a computer would. Are they the same?

I will try
thanks alot