You can use any valid identifier (an identifier can't have spaces and can't start with a numberįinally, our first BlueJ class has been compiled and run. If you've used Jeroo this is the same as the name of the Jeroo. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects. There will be a prompt asking you for the instance name. To associate your repository with the bluej topic, visit your repos landing page and select 'manage topics.' GitHub is where people build software. To run the class, just right click on the HelloWorld icon and select 'new HelloWorld()'.Once the class has been compiled it is no longer striped. ![]() To do so right click on the project and select 'compile' We must now 'compile' our source code into bytecode. Now that we are done writing our code, let's close the the editor.Add the following line of code inside the Constructor of HelloWorld. Now, let's add the code that will print out Hello World when we run the program. Just ask anyone in the AP class! Here's what my version of BlueJ has as the default code of each class. Now, if you've never programmed before, you may see a lot of daunting looking stuff! Eventually though, what you are looking at below will seem quite familiar and not daunting at all. To do so, right click on the "HelloWorld" icon and select 'Open Editor' Now let's actually start programming!."Helloworld" is just as valid of a classname but " Hello World" is NOT a valid clas name. You cannot have a blank space in the name of a class. By convention class names start iwth a capital letter though Java does not require this. Not surprisingly, the way that you create a new class is to click on the "new class" button!.The blank document with the turned corner represents the project: Your screen should now look like this picture. 1) After opening up BlueJ, select 'new project.' Let's call our first BlueJ project " FirstProject".Creating and Running programs in BlueJ Getting Started with BlueJĪnd installed BlueJ before completing the following steps.įrom the class web site. You don't have to put them in the BlueJįolder, just remember where you download them to on your computer. The icon you created when you downloaded and installed BlueJ or by In this example I will assume they have been downloaded to the desktop. The file called fs with a text editor.This file is located in the lib directory in You can alter some of the defaults for BlueJ my modifying Navigating to the BlueJ directory and double clicking on the bluej.bat icon. You can also modifying the template that starts when creating new programs and classes. When BlueJ is up and running you should see a window that looks something like this: The template is stored in the lib -> english -> templates -> newclass folder. To create a new program you first need to create a new project. ![]() Click on the Project menu and select New Project.įrom this window type in the name of the new project in the text field File name. It canĪfter giving the new project and name and clicking Create The name of the project does not have to be the sameĪs the name of the java file you will later add to the project. There aren't any classes, which are the basic building blocks of programs in Java, or code associated with the project yet. You can double click on it to addĬomments about the project as a whole or write notes to yourself on things Icon that looks like a piece of paper is just a simple text file that actsĪs the projects readme file. If you need to add any pre-existing classes to the project now is a good time to do that. Menu and then select Add Class from File.Ī new window pops up that allows you to navigate to the correct directory and select the file you To add the existing file to the project click on the Edit On the first assignment you need to download and add then add the DrawingPanel.java class to your project. Navigate to the directory that contains the file or files you want to add. If you want to add a single file, click on it and then click on the Add button. If you want to add 2 or more files from the same directory hold down the CTRL key and click on all the files you want to add, then click on the Add button. Now the new file / class has been added to the file. It shows up with diagonal lines because it has not been compiled yet. To compile a class that is part of a program you can either click the Compile button on the left side of the window or right click on the icon of the class and select the Compile option from the pop up menu. If the class does not have any syntax errors it will now be shown without any diagonal lines on its icon. To add a new class to the project click on the New Class button.Ī menu pops up asking for the name of the class.
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