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Revision as of 13:52, 7 August 2014
| Time | Narration |
| 00:01 | Hello everyone. |
| 00:02 | Welcome to the tutorial on Building GUIs using Netbeans. |
| 00:06 | In this tutorial, we will see one of the most attractive features of Netbeans, which is its GUI Builder. |
| 00:13 | What does Netbeans provide for building GUI? |
| 00:16 | It gives you a What You See Is What You Get designer to create your GUI. |
| 00:21 | Also it gives you an easy interface to drag-and-drop components to create your layout. |
| 00:27 | It comes with a Component Palette which has preinstalled AWT and Swing components. |
| 00:33 | We will be making use of this powerful visual editor to build a complete GUI application in just a few minutes. |
| 00:39 | For this demonstration I'm using a system that has |
| 00:43 | The Linux Operating system Ubuntu v11.04 |
| 00:46 | and has the Netbeans IDE v7.1.1 |
| 00:50 | For more details on the installation and requirements please refer to the previous tutorial. |
| 00:56 | In this tutorial we will learn to |
| 00:58 | Use the Form Editor |
| 01:00 | The Source Editor |
| 01:02 | The Palette, Inspector, and Properties features |
| 01:05 | Add event handlers |
| 01:07 | And also Compile and run our application |
| 01:10 | Let's get started and build a simple Account balance application in this tutorial |
| 01:15 | For this application we want to be able to |
| 01:18 | Input the amount credited to the account. |
| 01:21 | The amount debited from the account. |
| 01:24 | And compute the final balance. |
| 01:26 | We will also add a picture to make our application look more attractive. |
| 01:31 | Let's also have a menu bar on top for easy and quick navigation. |
| 01:35 | Let's now move to netbeans and start by creating a new project. |
| 01:40 | Fron the File menu choose New Project > and choose a Java Application. Say Next. |
| 01:49 | And give your project a name |
| 01:51 | I will name my project as Account balance. |
| 01:58 | Don't create a main class but set it as the main project. |
| 02:02 | Say Finish,' that should create a new project in your IDE |
| 02:07 | Now go back to File in the File menu and select New File |
| 02:15 | Choose Swing GUI forms under Categories |
| 02:18 | and Jframe Form under File Type |
| 02:21 | Say Next. |
| 02:24 | I'm going to call this AccountBalance as well, |
| 02:29 | But you can give it any other name you wish to. |
| 02:33 | Once you say Finish, it takes you to the main design area. |
| 02:39 | Lets get familiar with the GUI builder. |
| 02:43 | On the right here is the palette |
| 02:45 | This contains the pre-installed Swing and AWT components. |
| 02:49 | Down here below the palette is the Properties window. |
| 02:53 | This shows you the properties of the components as you choose them. |
| 02:58 | On the left here is the navigator or the inspector |
| 03:01 | which shows you the components that have been added to the frame. |
| 03:05 | Here on the workspace in the design mode |
| 03:08 | On the top here is the Source button |
| 03:11 | When you click on it, it takes you to the source code. |
| 03:15 | As you add components to the design, |
| 03:18 | 'it takes the corresponding source code and adds it to the source here. |
| 03:23 | Let's go back to Design mode and see what components we'll use today. |
| 03:28 | We will be using some of the components from the palette |
| 03:31 | such as Buttons, Labels, Panels, Tabbed pane etc to create our applications |
| 03:38 | Now from the Palette let us choose a TabbedPane under swing Containers |
| 03:45 | Select Tabbed Pane and click on the form |
| 03:50 | This should give you a Tabbed frame. You can re-size it using your mouse. |
| 03:58 | Now Go back to the Palette and choose a Panel. |
| 04:02 | And Click again on your frame |
| 04:06 | That should give you a tab. |
| 04:09 | Go back and choose another Panel. And click on the form again |
| 04:14 | That gives you 2 tabs totally |
| 04:17 | Now you can Rename the tab by either double clicking on the tab or right clicking on the tab and selecting the Edit Text option |
| 04:29 | I will call the first tab as Image and rename the second tab to Balance |
| 04:37 | Now Let's go back to the Palette and add labels from swing Controls menu |
| 04:43 | Choose Label from the Swing Controls and add it to your form here |
| 04:48 | We are going to need 6 labels for our application. |
| 04:54 | I have now added six labels to my form |
| 04:58 | You can position and align them as you click them |
| 05:02 | And also use the mouse to re-position or re-align them. |
| 05:06 | Now to change the text on a label |
| 05:08 | You can either double click on it or right click on it |
| 05:12 | and choose the options Edit Text |
| 05:14 | Let us rename the labels now |
| 05:16 | I'm going to call the first one as Initial Amount. |
| 05:22 | The second label as Credit Amount. |
| 05:30 | The third one as Debit amount |
| 05:35 | And the fourth one as Balance |
| 05:41 | Initially, we'll set the initial amount to be Rs 5000. |
| 05:48 | Once we compute the balance we can put it into this level |
| 05:53 | But for now we will just make it as stars |
| 06:01 | Now, go back to the Palette and choose a TextField and we will add to text fields one each next to the credit amount and to the debit amount. |
| 06:16 | We should also leave the Textfield places blank. |
| 06:20 | Let me edit the text and remove the existing text here |
| 06:27 | Let us resize it using the mouse |
| 06:35 | Once you have done that, you can now go back to palette and choose a Button. |
| 06:42 | Add a button below your frame and |
| 06:48 | You can change the label by right clicking on it. |
| 06:53 | Choose the Edit text option and name it as Get Balance |
| 06:58 | Now this is our GUI! |
| 07:01 | Let's now go to the Image tab (tab1) and add an image. |
| 07:05 | To do that let's go back to the Palette |
| 07:08 | and choose another Label, and drop it on the panel. |
| 07:13 | Now from to Properties Window below the palette, search for the icon property and click on the 3 dots here on the right. |
| 07:26 | The icons properties windows opens |
| 07:28 | Here choose the options External Image, click on the (...) 3 dots again here on the right. |
| 07:35 | And look for the image you want to include in your applicaton |
| 07:41 | I have selected the image here. Click on OK |
| 07:48 | Let us repostion it using the mouse. |
| 07:51 | You can remove the text here on the label by double clicking on it and removing the text |
| 07:59 | Now we have added in image |
| 08:02 | Let us next add a menu to our GUI |
| 08:05 | Go to the palette and select the Menu bar option under swing menus |
| 08:12 | Choose Menu Bar and click here on top of panel. |
| 08:17 | By default it already has 2 Menu labels: File and Edit. |
| 08:22 | Double click on the Edit text and rename it to Help. |
| 08:28 | You can also add a submenu under File. |
| 08:32 | Now in the Inspector or the navigator on the left side , right-click on JMenu1 , |
| 08:39 | Choose Add From Palette option and Select Menu Item. |
| 08:45 | That should add a MenuItem. |
| 08:47 | You can also rename that to say Exit. |
| 08:54 | Now we have added a submenu under the file menu and rename that menu item as well |
| 09:00 | Now, our GUI is more or less complete. |
| 09:03 | Let's now look at a preview. |
| 09:05 | Click on the 'Preview Design' button on the top |
| 09:09 | That shows a preview of what you have done so far. |
| 09:12 | Here, the buttons don't work yet . |
| 09:16 | But once you add in the code, you can have everything working. |
| 09:20 | Let us close the preview |
| 09:22 | Now, before adding the code, let's give proper variable names to the input textfields. |
| 09:28 | Go to the Balance tab, let us give proper variable name to these text fields here. |
| 09:34 | Right click on JTextfield1 in the inspector. |
| 09:40 | Select change variable name. |
| 09:43 | Let us change the variable name to Credit amount |
| 09:50 | Click on Ok |
| 09:53 | You can also right click on the textfield here in the design mode |
| 09:56 | Select Change Variable Name. |
| 10:00 | And change variable name into debitAmount. |
| 10:04 | Click on OK |
| 10:08 | I'm also going to call this final label i.e the stars textfields label as resultBalance. |
| 10:16 | Select the Change variable name option again and change the variable to resultBalance |
| 10:23 | Click on OK |
| 10:25 | Let's now see the code, to get the application working. |
| 10:30 | Now this is my sample code |
| 10:32 | What I want is to getText() from the creditAmount; |
| 10:37 | getText() from the debitAmount, |
| 10:39 | compute the balance and place the amount in the final resultBalance. |
| 10:44 | Let us copy the code here and let us go back to the IDE |
| 10:51 | Now right click on the Get Balance button. |
| 10:55 | Choose the option Events, Action and Action Performed |
| 11:00 | This will take you to the section of the code |
| 11:03 | where you will have to write or paste the code for the action to be performed on the button press. |
| 11:10 | Let me paste the copied code here |
| 11:17 | Let's save this code and go back to Design mode |
| 11:22 | Now lets adding the code to Exit the application. |
| 11:25 | Right click on the MenuItem, Exit and Choose Events, Action and Action Performed. |
| 11:40 | It switches to the source mode and now we have to a write the code to Exit successfully from the application |
| 11:46 | That is going to be System.exit(1). |
| 11:53 | Now Save the code and go back to design mode. |
| 11:57 | Let us also add a shortcut to the Exit MenuItem |
| 12:02 | Double click on the shortcut option here in the Window thats opens |
| 12:07 | Give the key stroke as Q and Ctrl and Click on OK |
| 12:14 | So now we have set Ctrl Q as the keyboard shortcut to quit from the application |
| 12:20 | That its our application is now complete |
| 12:23 | Let's now run the application by pressing F6 on your keyboard. |
| 12:30 | It as already selected the main class that as to run |
| 12:33 | Click on OK |
| 12:37 | And here it is. This is our GUI |
| 12:40 | Now let's run a check |
| 12:43 | Go to the balance tab, enter the credit amount with Rs.300/-. |
| 12:47 | And the debit amount as Rs.200. And Say 'Get Balance'. |
| 12:53 | This gives us the correct amount in the balance. |
| 12:56 | Let us now exit from the application. |
| 12:58 | I'll Go to File menu and I'll click on Exit. |
| 13:02 | We could have also quit the application by pressing Ctrl Q on the keyboard |
| 13:08 | Now With the application complete, it's time for the assignment. |
| 13:14 | The task is to create a Temperature convertor application. |
| 13:18 | I should have to tabs like the previous one |
| 13:21 | 1 to convert from Centigrade to Fahrenheit and another for Fahrenheit to Celsius. |
| 13:27 | It should also take an input temperature. |
| 13:30 | And Display the converted temperature |
| 13:33 | It should also have a menu bar on top that shows File and Help options |
| 13:38 | And under the file menu have an Exit item with a keyboard shortcut to Exit from the application |
| 13:46 | I have already solved the assignment |
| 13:48 | Let us see how it shoud look |
| 13:50 | I'm going to run my assignment and this is my GUI |
| 13:56 | Now let us Enter the input temperature as -40 Celcius and let me click on get Fahrenheit |
| 14:05 | The application should give the correct converted output temperature. |
| 14:10 | Now let us try the short-cut key to Exit i.e Ctrl X to exit from the application. |
| 14:18 | So we have successfully exited from the application upon the keyboard shortcut |
| 14:25 | Watch the video available at the link shown on the screen. |
| 14:29 | It summarizes the Spoken Tutorial project. |
| 14:32 | If you do not have good bandwidth, you can download and watch the videos. |
| 14:37 | The Spoken Tutorial project team conduct workshops using Spoken Tutorials. |
| 14:42 | Gives certificates to those who pass an online test. |
| 14:46 | For more details please write to contact@spoken-tutorial.org |
| 14:52 | Spoken Tutorial Project is a part of the Talk to a Teacher Project |
| 14:56 | Supported by the National Mission on education through ICT, MHRD, Government of India |
| 15:03 | More information on this mission is available at spoken-tutorial.org/NMEICT-Intro |
| 15:13 | This tutorial has been contributed by IT for Change |
| 15:17 | Thank you for joining us. |
