Swing

The GUI toolbox Swing

Examples

Note : the two examples SwingApplication and CoordinatesDemo come from the tutorial about the SDK5.0. These examples are no longer included in the current tutorial, which is mainly based on the use of the IDE NetBeans.

Hello World

The two following examples give the same result, but using two different implementations for handling the "action" event on the button :

In this version , the main class implements ActionListener and then, is used as instance of ActionListener to listen the button.
In this version, the instance of ActionListener is written using an anonymous inner class.

SwingApplication

This example of a simple application comes from the Java tutorial.

Layout Demos

These examples come from the Java tutorial. The most useful layout managers are (in my opinion) :

Border Layout
Box Layout
Flow Layout
Grid Layout
GridBag Layout

Coordinates Demo

This example, which explains how to draw in a component, comes from the Java tutorial.

Line

This example, shows how to draw an line segment starting where you have pressed the mouse button and ending where you have released it.
A similar example, using Graphics2D instead Graphics.

Browser

This example shows how to implement a simple web browser. More specifically, it contains a generic history.

First version
- The Browser class allows to load an html page, given its url, and then to load other pages following the hyperlinks.
- When a web page cannot be loaded, a default page, Failure.html, is used to prevent the user.
Version with history

The history is implemented in a generic way in the class History. Then it may be reused in any context where a history is needed. History extends Observable and it is this class which will activate the updates of the two others components Browser and HistoryBar, which are instances of Observer.
HistoryBar uses two images for its buttons : HorizontalPrevious.png et HorizontalNext.png, placed in a directory named images.
When a web page cannot be loaded, a default page, Failure.html, is used to prevent the user.

Version with multiple windows and a menu

In this version, classes History, HistoryBar and Failure.html are unchanged.
The class Browser has been renamed BrowserFrame. The frame is completed by adding a menu "File" allowing to create or close a frame, or to quit the application. Setting the size and showing the frame is left to the responsibility of the client of the class BrowserFrame.
Frames are managed by a FrameController, implemented here by the class Browser. Please note the use of a dialog to confirm the intention to quit the program.