JFrame Close Button

[gabberatl]

Hi, I am new to Java. Better yet I'm new to programming PERIOD.

I have to write my Hello World program for my class and have it exit with an "Exit" button.

I cannot get it to work properly.

Can someone please help!!!!

This is what I have. It runs smoothly just cannot figure out how to add the button.

import javax.swing.*;

public class HelloWorldGUI

{

private static void createAndShowGUI() {

JFrame frame = new JFrame("");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel label = new JLabel("Hello World!!!");

frame.getContentPane().add(label);

frame.pack();

frame.setVisible(true);

}

public static void main(String[] args) {

createAndShowGUI();
}

}

 

[feherke]

Hi

That is simple : add a [tt]JButton[/tt] which listens for [tt]ActionEvent[/tt]s handled by your class, ( for this your class will have to implement [tt]ActionListener[/tt], ) then in [tt]actionPerformed()[/tt] method you just dispatch a [tt]WINDOW_CLOSING[/tt] event.

If you want to keep the current [tt]JLabel[/tt] too, add a layout manager of your choice which will make possible arranging multiple widgets the way you want.

[red]import[/red] java[teal].[/teal]awt[teal].*;[/teal]
[red]import[/red] java[teal].[/teal]awt[teal].[/teal]event[teal].*;[/teal]
[red]import[/red] javax[teal].[/teal]swing[teal].*;[/teal]

[b]public class[/b] [COLOR=mediumorchid]HelloWorldGUI[/color] [b]implements[/b] ActionListener [teal]{[/teal]
    [COLOR=orchid]JFrame[/color] frame[teal];[/teal]

    [b]private[/b] [maroon]void[/maroon] [COLOR=orange]createAndShowGUI[/color][teal]()[/teal]
    [teal]{[/teal]
        [COLOR=orchid]JLabel[/color] label [teal]=[/teal] [b]new[/b] [COLOR=orange]JLabel[/color][teal]([/teal][i][green]"Hello World!!!"[/green][/i][teal]);[/teal]
        [COLOR=orchid]JButton[/color] button [teal]=[/teal] [b]new[/b] [COLOR=orange]JButton[/color][teal]([/teal][i][green]"Run, Forrest, run !!!"[/green][/i][teal]);[/teal]

        button[teal].[/teal][COLOR=orange]addActionListener[/color][teal]([/teal][b]this[/b][teal]);[/teal]

        frame [teal]=[/teal] [b]new[/b] [COLOR=orange]JFrame[/color][teal]([/teal][i][green]""[/green][/i][teal]);[/teal]
        frame[teal].[/teal][COLOR=orange]setContentPane[/color][teal]([/teal][b]new[/b] [COLOR=orange]JPanel[/color][teal]([/teal][b]new[/b] [COLOR=orange]FlowLayout[/color][teal]()));[/teal]
        frame[teal].[/teal][COLOR=orange]setDefaultCloseOperation[/color][teal]([/teal]JFrame[teal].[/teal]EXIT_ON_CLOSE[teal]);[/teal]

        frame[teal].[/teal][COLOR=orange]getContentPane[/color][teal]().[/teal][COLOR=orange]add[/color][teal]([/teal]label[teal]);[/teal]
        frame[teal].[/teal][COLOR=orange]getContentPane[/color][teal]().[/teal][COLOR=orange]add[/color][teal]([/teal]button[teal]);[/teal]
        frame[teal].[/teal][COLOR=orange]pack[/color][teal]();[/teal]

        frame[teal].[/teal][COLOR=orange]setVisible[/color][teal]([/teal][b]true[/b][teal]);[/teal]
    [teal]}[/teal]

    [b]public[/b] [maroon]void[/maroon] [COLOR=orange]actionPerformed[/color][teal]([/teal][COLOR=orchid]ActionEvent[/color] e[teal])[/teal]
    [teal]{[/teal]
        frame[teal].[/teal][COLOR=orange]dispatchEvent[/color][teal]([/teal][b]new[/b] [COLOR=orange]WindowEvent[/color][teal]([/teal]frame[teal],[/teal] WindowEvent[teal].[/teal]WINDOW_CLOSING[teal]));[/teal]
    [teal]}[/teal]

    [b]public static[/b] [maroon]void[/maroon] [COLOR=orange]main[/color][teal]([/teal]String[teal][][/teal] args[teal])[/teal]
    [teal]{[/teal]
        [b]new[/b] [COLOR=orange]HelloWorldGUI[/color][teal]().[/teal][COLOR=orange]createAndShowGUI[/color][teal]();[/teal]
    [teal]}[/teal]

[teal]}[/teal]

Feherke.
feherke.ga