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 :

Code :

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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");
}
 
}

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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)


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if you plz help me

Quote:

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addActionlistner

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

Quote:

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Originally Posted by Sean4u

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

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thank you
but how can I check them ??

Quote:

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but how can I check them ??

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

Quote:

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addActionListener

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Your post
...copy...paste

Quote:

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addActionlistner

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

Quote:

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addActionListener

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Quote:

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addActionlistner

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

Quote:

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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?

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I will try
thanks alot