![]() 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. There will be a prompt asking you for the instance name. 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.line 4: make a constant, because this is not a very big game, we cant reach. Add the following line of code inside the Constructor of HelloWorld. This is of course not what you see, but it is what the program executes. Now, let's add the code that will print out Hello World when we run the program. When you open BlueJ, the first thing you want to do is click on Project New Project, then you give your project a name and its destination folder. 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. ![]() You should see three yellow boxes named JavaGame, GameWgt and GameEvent which are the three public.
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