Compiler Problems with WindowListeners

[Mike Kelly]

Compiler error, has to do with WindowAdapter and event class. I can't figure it out, please help!
import java.awt.*;
import java.awt.event;
class MyButton extends WindowAdapter {
MyButton() {
Frame f = new Frame("Top Teams in the NFL");
WindowAdapter w = new WindowAdapter();
f.addWindowListener(w);
f.setLayout(new FlowLayout());
f.setSize(500,300);
f.setBackground(Color.darkGray);
Button a = new Button("Raiders");
Button b = new Button("Ravens");
Button c = new Button("Rams");
Button d = new Button("Steelers");
Button e = new Button("Niners");
Button g = new Button("Bears");
f.add(a);
f.add(b);
f.add(c);
f.add(d);
f.add(e);
f.add(g);
f.setVisible(true);
}

public void windowClosing(WindowEvent e) {
window.setVisible(false);
displayMessage("Window closing", e);
}

public static void main(String args[]) {
MyButton mf = new MyButton();
}
}

[Marilyn de Queiroz]

<font size=2>
import java.awt.*;
import java.awt.event;
  
class MyButton extends WindowAdapter {
    MyButton() {
        Frame f = new Frame("Top Teams in the NFL");
        // <font color=blue>illegal statement since WindowAdapter is abstract and cannot be instantiated.</font>
        WindowAdapter w = new WindowAdapter(); 
        // <font color=blue>create an anonymous class that extends WindowAdapter here.</font>
        f.addWindowListener(w);
        f.setLayout(new FlowLayout());
        f.setSize(500,300);
        f.setBackground(Color.darkGray);
        Button a = new Button("Raiders");
        Button b = new Button("Ravens");
        Button c = new Button("Rams");
        Button d = new Button("Steelers");
        Button e = new Button("Niners");
        Button g = new Button("Bears");
        f.add(a);
        f.add(b);
        f.add(c);
        f.add(d);
        f.add(e);
        f.add(g);
        f.setVisible(true);
}
  
    public void windowClosing(WindowEvent e) {
        // <font color=blue>Where do you declare window?</font>
        window.setVisible(false);
        // <font color=blue>Where is your displayMessage method?</font>
        displayMessage("Window closing", e);
    }

    public static void main(String args[]) {
        MyButton mf = new MyButton(); 
    }
}

Add an asterik after import java.awt.event.*; to start with. Notice the comments in blue. These won't solve all your problems, but I hope it will give you a start.


[This message has been edited by Marilyn deQueiroz (edited November 28, 2001).]

[Mike Kelly]

Thanks Marilyn, I'll give it a try. Much appreciated.