Programs with a Graphical User Interface (GUI)

The table below contains links to computer programs that provide a Graphical User Interface (GUI) to their users. This means in practice that the programs open new windows to the computer screen. The windows may contain buttons, text fields, scrollbars, and many other graphical elements (widgets), and the user can control the programs with a mouse. With these programs you can study the basics of writing GUI programs. You need to know the basics of programming before you start studying these programs. These programs are not presented in the books of Kari Laitinen.
More general information.
© 2006-2009 Kari Laitinen

	Java	Python Qt	Python GTK/Linux	C# (Windows)
	Java programs should run in all operating systems provided that the Java Runtime Environment (JRE) for the operating system in question is installed. Those Java programs whose name ends with the word "Applet" are programs that run on a web page. Those programs whose name contains the word "Application" are Java applications that can be executed in traditional way. A suitable .html file is provided for the applets so that you can run the programs with your Java-enabled browser. All Java GUI programs.	These Python programs should run in all operating systems into which suitable Python and PyQt installations have been made. Qt is a set of class libraries with which you can build applications for several operating systems (Windows, Linux, MacOS, etc.) PyQt is a library through which Qt classes can be used in Python programs. All Python Qt programs.	These Python programs run on Linux platforms. These programs utilize a version of the PyGTK library. The programs that have "GTK" in their name run on traditional Linux platforms. The programs that have the word "Maemo" in their name run on the Maemo platform, which is a Linux-based operating system used in Nokia Internet Tablets (e.g. Nokia 770, N800, N810). Many of the GTK programs run on Maemo as well. All Maemo versions. All GTK versions.	C# is a programming language that was developed for Windows programming. Hence, these programs run best in Windows computers. The .NET Framework should be installed in the used computer. If necessary, you can compile and run these programs via the command prompt window. Here you can find more information about the compilation and execution of C# programs. All C# GUI programs.
Simple programs which show some text in a window.	HelloApplet.java Hello.html HelloPanelApplet.java HelloPanel.html HelloAWTApplet.java HelloAWT.html HelloSimpleApplet.java HelloSimple.html	HelloQt.py	HelloGTK.py HelloSimpleGTK.py HelloMaemo.py HelloSimpleMaemo.py	HelloApplication.cs
Programs that demonstrate methods that can be used to draw various graphical objects (e.g. rectangles, lines, ovals, arcs, texts, etc.) into a window.	DrawingDemoApplet.java DrawingDemo.html DrawingDemoPanelApplet.java DrawingDemoPanel.html DrawingDemoAWTApplet.java DrawingDemoAWT.html EarthAndMoonApplet.java EarthAndMoon.html	DrawingDemoQt.py EarthAndMoonQt.py	DrawingDemoGTK.py DrawingDemoMaemo.py EarthAndMoonGTK.py
Using advanced 2D graphics in drawing: moving the zero point of the graphical coordinate system, rotation of the coordinate system, scaling graphical objects.	FlyingArrowApplet.java FlyingArrow.html StarsApplet.java Stars.html AceOfSpadesApplet.java AceOfSpades.html	FlyingArrowQt.py StarsQt.py		FlyingArrowApplication.cs
Programs that produce animation to the screen. These programs demonstrate the use of threads.	AnimationDemoApplet.java AnimationDemo.html WormApplet.java Worm.html WormPanelApplet.java WormPanel.html WormOffscreenApplet.java WormOffscreen.html PacmanApplet.java Pacman.html	AnimationDemoQt.py	AnimationDemoGTK.py AnimationDemoGTKnoclass.py WormGTK.py	AnimationDemoApplication.cs
Programs that display a graphical clock to the screen. These programs demonstrate the use of threads and acquiring the current time.	ClockApplet.java Clock.html DoubleClockApplet.java DoubleClock.html	ClockQt.py	ClockGTK.py	ClockApplication.cs ClockOffscreenApplication.cs
Programs that show how picture files (e.g. .jpg files) can be shown on the screen. The used picture files can be found at the end of this folder.	SinglePictureApplet.java SinglePicture.html SinglePictureApplication.java PictureShowApplet.java PictureShow.html EnlargingPicturesApplet.java EnlargingPictures.html	SinglePictureQt.py PictureShowQt.py	SinglePictureGTK.py PictureShowGTK.py PictureShowSimpleGTK.py	SinglePictureApplication.cs
Programs that demonstrate how a program can react to mouse events such as pressings of a mouse button or mouse movements. In some systems (e.g. Maemo) mouse is replaced by a stylus.	ClickingsApplet.java Clickings.html DrawingLinesApplet.java DrawingLines.html DrawingLinesPanelApplet.java DrawingLinesPanel.html DrawingLinesApplication.java DrawingRectanglesApplet.java DrawingRectangles.html MouseDemoApplet.java MouseDemo.html	ClickingsQt.py MouseDemoQt.py	ClickingsGTK.py ClickingsGTKArray.py DrawingLinesGTK.py MouseDemoGTK.py	MouseDemoApplication.cs
Programs that demonstrate how a program can react to keyboard events, i.e., find out when keys are pressed and released on the keyboard.	KeyboardInputDemoApplet.java KeyboardInputDemo.html	KeyboardInputDemoQt.py	KeyboardInputDemoMaemo.py KeyboardInputFullScreenMaemo.py KeyboardInputDemoGTK.py
Programs that demonstrate the use of buttons and a list of choices.	MovingBallApplet.java MovingBall.html MovingBallPanelApplet.java MovingBallPanel.html MovingBallApplication.java MovingBallPanelApplication.java MovingBallAWTApplet.java MovingBallAWT.html MovingBallAWTApplication.java	MovingBallQt.py	MovingBallMaemo.py MovingBallGTK.py	MovingBallApplication.cs
Object-oriented versions of the previous programs.	Ball.java MovingBallOOApplet.java MovingBallOO.html	BallQt.py MovingBallOOQt.py	BallGTK.py MovingBallOOGTK.py
Programs which show three Ball objects in a window and it is possible to drag the balls by using a mouse or a stylus.	Ball.java MovingBallWithMouseApplet.java MovingBallWithMouse.html	BallQt.py MovingBallWithMouseQt.py	BallGTK.py MovingBallWithMouseGTK.py
Programs that demonstrate the use of text fields and text areas. These are display components (widgets) into which the user can write text.	SumApplet.java Sum.html NewTextFileApplication.java		SumGTK.py	SumApplication.cs
Programs that demonstrate the use of scrollbars and radio buttons.	RectangleApplet.java Rectangle.html RectangleAWTApplet.java RectangleAWT.html		RectangleMaemo.py RectangleGTK.py
The use of "slider", "spinner", and label objects in GUI construction.	CurtainsApplet.java Curtains.html	CurtainsQt.py	CurtainsGTK.py
Programs that show how menus, pop-up menus, and toolbars can be built.	MenuDemoApplet.java MenuDemo.html MenuDemoApplication.java MenuDemoWithToolbarApplication.java MenuDemoWithPopupMenuApplication.java MenuDemoWithPopupMenuSimple.java	MenuDemoApplicationQt.py	MenuDemoApplicationGTK.py MenuDemoApplicationMaemo.py MenuDemoWithToolbarGTK.py MenuDemoWithToolbarMaemo.py MenuDemoWithPopupMenuGTK.py MenuDemoWithPopupMenu...	MenuDemoApplication.cs MenuDemoWithToolbar... MenuDemoWithPopupMenu...
These programs demonstrate active rendering and some advanced "graphical" and "geometrical" operations.	BeatingHeartApplet.java BeatingHeart.html AtomApplet.java Atom.html
Object-oriented programs constructed by using several classes.	DrawingGraphicalObjectsApplet.java DrawingGraphicalObjects.html WheelsApplet.java Wheels.html BouncingBallApplet.java BouncingBall.html FlagsApplet.java Flags.html	BouncingBallQt.py FlagsQt.py	FlagsGTK.py
Programs to check system properties.	SystemCheckApplet.java SystemCheck.html
More links.	Here you can find some of the above Java programs in Finnish. This means that comments and identifier names in the programs are written in Finnish. Here you can find some examples of Java midlets, Java programs that run in a mobile phone.

MORE INFO: How to use the programs on this page

The idea with these programs is that if you know how one program works, you can easily find out how the same program can be written with another programming language. For example, in the Java column of the table you can find a program named MovingBallApplication.java. In the next columns you can find programs MovingBallMaemo.py, MovingBallGTK.py, and MovingBallApplication.cs, which show how a program that works like MovingBallApplication.java can be written with the Python and C# programming languages. This table should be useful if you want to switch from one programming language to another.

The Java column of the table provides several versions of a single program. Most of these programs are so-called Java applets. For example, program MovingBallApplet.java is a Java applet that works in the same way as MovingBallApplication.java. The benefit of the applets is that you can run them with your Internet browser when you click the .html file (e.g. MovingBall.html). The running of Java applets must be enabled in your Internet browser. Even if you are not searching for Java-related information, you might run the Java applets in order to find out how the corresponding Python or C# programs work.

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