main represents the starting point of the program.void is the return type of the method.The main() method is executed by the JVM, so it doesn't require creating an object to invoke the main() method. The core advantage of the static method is that there is no need to create an object to invoke the static method. If we declare any method as static, it is known as the static method. public keyword is an access modifier that represents visibility.class keyword is used to declare a class in Java.Let's see what is the meaning of class, public, static, void, main, String, ().
Happy Coding is a community of folks just like you learning about coding.When we compile Java program using javac tool, the Java compiler converts the source code into byte code. What programs can you run from the command prompt? Practice using the command prompt by navigating around your file system using it.Explain in your own words what the PATH variable is.If you get an error here, make sure you’ve set your PATH correctly! Homework: That should print out the version of Java you just installed. We’ll also talk more about this in the next tutorial, but for now type java -version and hit enter. If you get an error here, make sure you’ve set your PATH correctly! We’ll talk more about this in the next tutorial, but for now type javac -version and hit enter. Then cd into it by typing cd HelloJava and pressing enter. Type mkdir HelloJava to create a directory named HelloJava. For example, to cd to my desktop I would type cd desktop and then press enter. Try to cd into one of the directories listed by the dir command. Type dir and press enter, and you should see a list of files.Ĭd changes directories. Try these commands:ĭir lists everything in the current directory. You can use the command prompt by typing commands and pressing the enter key. Click that to open the command prompt, which looks like this: To open the command prompt, go to the start menu and then type “command” until you see a shortcut that says Command Prompt. It’s how a lot of coding tools are run, and it’s how we’re going to work with Java for now. The command prompt is a text-based interface that lets you interact with the computer without any windows. Press OK in all the dialogs to accept your changes. It’s usually something like C:\Program Files\Java\jdk1.8.0_121\bin, but with different numbers depending on the latest version of Java. button.įinally, on that screen, click the New button and then paste the path the installer put Java. On that screen, find a variable called PATH, select it, and click the Edit. On that screen, click the “Environment Variables…” button, which opens up the Environment Variables dialog: Click that, which opens the System Properties dialog:
On Windows 10, you can open the start menu and just type “path” which will show you an option for editing the system environment variables. Here are instructions for setting the PATH on different operating systems. We need to make sure that Java is on your PATH. PATH is an environment variable that tells your computer where programs are located. Remember where the installer puts Java- you’ll need that location in the next step! Set your PATH
When the download completes, run the installer. That takes you to a page containing OS-specific download files. Go here and find the download button that says JDK (not JRE) and click that. Since you’ll be writing code, you need to download the Java Development Kit, aka the JDK. If you haven’t done them yet, go do them before moving on to Java! Download the JDK When we get to the programming part, I’m going to assume you’ve already been through the Processing tutorials. This tutorial introduces Java and goes over the steps you need to follow to program Java on your computer.