Help ................java

Bonjour,

*
* @(#)Gatt.java 1.0 08/08/13
*
* You can modify the template of this file in the
* directory ..\JCreator\Templates\Template_1\Project_Name.java
*
* You can also create your own project template by making a new
* folder in the directory ..\JCreator\Template\. Use the other
* templates as examples.
*
*/
package myprojects.gatt;

import java.awt.*;
import java.awt.event.*;

class Gatt extends Frame {

public Gatt() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
System.exit(0);
}
});
}

public static void main(String args[]) {
System.out.println("Starting Gatt...");
Gatt mainFrame = new Gatt();
mainFrame.setSize(400, 400);
mainFrame.setTitle("Gatt");
mainFrame.setVisible(true);
}
}

qustions
quelle ligne on utlise pour comance ma iterface .............;les etape pour réalise interface (SVP exemple)