Java #N1 – Getting Started with Netbeans


In this video, we’ll look at creating a very simple project using Netbeans. We’ll begin at the Netbeans start page. On the file menu, we select
new project. For the project category, we’ll select
Java, and then Java Application. Unless you have a lot of existing
files, and are a more advanced Java programmer, I’d recommend against using
“Java Project with Existing Sources”. It is very easy to simply drag files
into the project, as we’ll see later. “Java Desktop Application”
creates a graphical user interface, or GUI, but this also is more
complicated than I like, and it is easy enough to add that later, so I’ll stick with the “Java Application”. Now push “next”. This brings up a screen where
you can give the name and location of the project. I’ll call this MyFirstProject, and accept the default location, which is a “NetBeansProject”
folder under my documents. Below that it asks if you want
to create a main class. If you already have a program,
uncheck this, but I’ll go ahead and create one. We’ll also let this be the
“main project”. Netbeans allows you to have
multiple projects open at the same time and have one main
one that you’re working on. I find it easier to only have one
project open at a time, and I always want that one to be
the main one. You’ll note that the name of the
main class is the name of the project “dot Main”. Having a dot in the name uses
the Java idea of “packages”, which are useful for large
projects and lets you store files in multiple folders. Since we’re starting small, I’m
going to get rid of that, and only put in class name of
“HelloWorld”. Remember to capitalize the name
of the class. Now let’s look at the many folders
Netbeans created. We have “src”, which is where the
Java source code will go, “build”, which will contain the
compiled classes, “dist”, where it creates JAR files you
can distribute to others, “test”, which is for automated testing,
and “nbproject” which has some Netbeans-specific
files. To start, you’re mostly interested
in what is in the “src” folder and can ignore all the rest. Back in Netbeans, we can see
the created project. There are also tabs for files and
services. I’m going to close these to reduce
the amount of clutter. If you want them back, you can
get them from the Window menu. I’ll pretend to accidentally close
the projects window and then show it again using the menu. We can right click on the project,
close it, and then open it again. You can see it on the “recent
projects” on the start page, and in File/Open Recent Project,
but I’ll open it using File/Open Project so you can see how.
We open HelloWorld. java by opening source packages
and default package and double-clicking on it. You can see that Netbeans has
added a lot of code for us, and put a “TO DO” for us to add
code. I’ll add a println. Notice that as soon as I type
“System dot”, Netbeans shows a lot of suggestions. Also, Netbeans is constantly
compiling in the background, so if I type something wrong, like
leaving off the “n” at the end of println, a red squiggly appears under the
line indicating there is an error. Hovering over the red exclamation
mark, I can see the error message. To run the program, simply hit the
green “run project” button. We can add more than one file,
or even more than program to a project. By simply dragging a file into the
project, it is added. We can then run the other file
by right clicking on it and selecting “run file”. Netbeans is an extremely
powerful IDE with lots of options that can be intimidating, but you can also use only a
small subset of it fairly easily.

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