event listners

[ronak mehta]

public class CloseWindow extends Frame implements WindowListener {
public CloseWindow() {
addWindowListener(this); // This is listener registration
setSize(300, 300);
setVisible(true);
}
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public static void main(String args[]) {
CloseWindow CW = new CloseWindow();
}
}
A) Compile time error
here i have one program and it says that when it will run it gives compile time error why?

[Thomas Paul]

Two reasons:
1) You have no import statements:
import java.awt.*;
import java.awt.event.*;
2) Since you are implementing WindowListener you need to implement the windowOpened(WindowEvent) method

[ronak mehta]

thanks thomas

[Asma Zafar]

you have to implement not only windowOpened but all the seven methods in the WindowListener interface apart from impoting the awt and awt.event classes.
Asma Zafar,
Sun Certified Java2 Programmer
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