![]() In this event, the suggested convention is to add an underscore. This can occur if the domain name contains a hyphen or other special character, if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as "int". In some cases, the internet domain name may not be a valid package name. ![]() Packages in the Java language itself begin with java. Name collisions that occur within a single company need to be handled by convention within that company, perhaps by including the region or the project name after the company name (for example, ). Package names are written in all lower case to avoid conflict with the names of classes or interfaces.Ĭompanies use their reversed Internet domain name to begin their package namesfor example, for a package named mypackage created by a programmer at. This works well unless two independent programmers use the same name for their packages. ![]() That is, the fully qualified name of the Rectangle class in the graphics package is graphics.Rectangle, and the fully qualified name of the Rectangle class in the java.awt package is. The fully qualified name of each Rectangle class includes the package name. Still, the compiler allows both classes to have the same name if they are in different packages. In fact, the previous example does just that: It defines a Rectangle class when there is already a Rectangle class in the java.awt package. Used Show debugger and reproduced issue but i do not see any logging or trace o_O, should it?įurther comments, suggestions or help are appreciated.With programmers worldwide writing classes and interfaces using the Java programming language, it is likely that many programmers will use the same name for different types. I checked and have the latest up-to-date as per the Help> Check Version. I did try reopening the package same issue.Īlso noticed that if i create a Staff object and try to compile any of the others which are diagonal stripped it deletes the object.I'm still doing research, found a couple of posts stating that the methods are old or something like that. If i try to right click any of the other ones: Database, Person or Student and select "Compile" i get "Compiling.Done" but the diagonal stripes do not disappear. "Recompile with -Xliint:unchecked for details"įollowed the steps on this post to disable the pop-up: Īt this point the diagonal stripes have ONLY disappeared for Staff. This time, you were prompted to fill-in the parameters of the Object, so it could set up its initial values. Note there are two String values, which need to be enclosed in quotes. You can copy the values shown below, and then click OK. You will now be given a prompt for both an Object name and parameters.Use the file selection dialog to enter a name and location for the project. shortcut: To create a new project, start BlueJ. This time, click on new Student(String, int, String) The BlueJ Environment Reference Manual, Version 2.0 2 1 Projects 1.1 Create a new project menu: Project/New Project.To see this, let's create one more Object, this time a Student: Notice how an object now shows up on the object bench.Īll you needed when creating that object was its name, but sometimes Objects ask for more information so they can start off with certain data. You'll get a box asking you to name your new object, but you can leave the default suggestion and click OK.Click on the second menu item, new Staff().To create an actual object, right-click on a Class and click on a "new" menu item. Creating ObjectsĪs mentioned before, Classes are like blueprints to define specific instances (or Objects) of code. The main pane shows a diagram of each Class in a project and their relationships with each other. You should then see the following screen (without the blue markup):īlueJ lets you create and view Classes and Objects in a visual manner. (You can also open a project from within BlueJ by clicking on Project > Open Project. Open the people folder and click on the BlueJ package.If you cannot find it, download a copy of examples and unzip it. On Windows, look in C:\Program Files (x86)\BlueJ or C:\Program Files\BlueJ. ![]() Find the folder where BlueJ is installed and open the examples folder inside.You can skip the "real code" parts for now, and come back to them to reference later. We will see different actions that you can do with BlueJ and also how its done with real code. More About BlueJīlueJ lets you interact with Objects in your code directly which helps when learning concepts or to try something out quickly. You can view a longer BlueJ tutorial on the BlueJ site. This node will cover the basics of using BlueJ and connect it to using Java. ![]()
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