Why does Swing not flicker?

Hi,
I have a JPanel that mixes some images painting and drawing ( all implemented in the paint() method). It works perfectly.
Then i have tried with a java.awt.Canvas and it started to flicker a lot.
Here the question: what does swing to remove the flicker, why it doesn't flicker??
Thanks

because Swing is already double buffered and AWT is not, you have to implement your own.
Google what is double buffered.
and by the way you don't override the paint method in swing you override the paintComponent method.

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I want to display the buttons in a row then radio button in a row under the button and then log scroll pane under the radio buttons. This is my code:
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Thanks guys.
This is my problem. We have a big system that produce lots of log files and the software testers have to manually have to go through the logs file and look for a certain XML tags in the log file.
What I want to do is help the software testers my developing a small tool that will allow them to open a log file and then click on a radio button corresponding to a xml tags that they are looking for and automatically highlight the tags in the file in yellow color .
I am not sure how feasible this is and I am stuck.
This is what I have done so far.
Can you please guys help me go forward.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
public class FileChooserDemo extends JPanel
                             implements ActionListener {
    static private final String newline = "\n";
    JButton openButton;
    JButton clearButton;
    JTextArea log;
    JFileChooser fc;
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    static String em01 = "EM01";
    static String em07 = "EM07";
    /*static String dogString = "Dog";
    static String rabbitString = "Rabbit";
    static String pigString = "Pig";*/
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        JRadioButton em01Button = new JRadioButton(em01);
        em01Button.setMnemonic(KeyEvent.VK_B);
        em01Button.setActionCommand(em01);
        em01Button.setSelected(true);
        JRadioButton em07Button = new JRadioButton(em07);
        em07Button.setMnemonic(KeyEvent.VK_C);
        em07Button.setActionCommand(em07);
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        ButtonGroup group = new ButtonGroup();
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        group.add(em07Button);
        //Register a listener for the radio buttons.
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        em07Button.addActionListener(this);
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        //to be selected (and, at least in the Java look and feel,
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     * event-dispatching thread.
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        //Create and set up the window.
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        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
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        //creating and showing this application's GUI.
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Why does Swing not flicker?

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