How To Create New Java File In Eclipse

Details: Written by; Last Updated on 11 March 2020 | Print Email

If you are new to Java programming and Eclipse IDE, this step-by-step tutorial helps you get started to be familiar with the most Java IDE by writing your first Java program using Eclipse. And you will be able to build and run your program inside Eclipse.

1. Download and Install Eclipse IDE

Eclipse is the most popular Integrated Development Environment (IDE) for developing Java applications. It is robust, feature-rich, easy-to-use and powerful IDE which is the #1 choice of almost Java programmers in the world. And it is totally FREE.

As of now (fall 2016), the latest release of Eclipse is Neon (version 4.6). Click the following link to download Eclipse:

http://www.eclipse.org/downloads/eclipse-packages

You will see the download page like this:

Eclipse Download Page

You can install Eclipse either by downloading the Eclipse Installer or package (zip file). I'd recommend you to download by package. Eclipse comes with various packages for different development purposes. For Java, there are two main packages listed as you see above:

Eclipse IDE for Java EE Developers: This is for developing Java EE applications (web applications using Servlets & JSP).
Eclipse IDE for Java Developers: This is for developing Java SE applications, a subset of the Java EE Developer package.

So I recommend you to install the Eclipse IDE for Java EE Developers package because sooner or later you will need to build Java web applications, although this tutorial only shows you how to write a Java console application.

Click on the link 32-bit or 64-bit (depending on the bit version of your operating system) to start download the package.

You will see the package name like this: eclipse-jee-neon-R-win32-x86_64.zip

Extract this ZIP file into a directory on your computer. You will see a directory called eclipse containing Eclipse's installed files:

Eclipse install directory

Eclipse Neon requires Java 8 or newer so make sure you have JDK 8 already installed on your computer. If not, follow this tutorial to install JDK.

Click eclipse.exe file (Windows) to start the IDE. You will see the splash screen of Eclipse Neo:

Eclipse Neo splash

That's it! You have successfully installed Eclipse IDE. Next, let's see how to create a workspace.

2. Choose a Workspace Directory

Eclipse organizes projects by workspaces. A workspace is a group of related projects and it is actually a directory on your computer. That's why when you start Eclipse, it asks to choose a workspace location like this:

Choose workspace

By default, Eclipse created a workspace directory at your USER_HOME\workspace. If you want to choose another directory, click Browse. Here I chose a different workspace:

Choose different workspace

Check Use this as the default and do not ask again if you don't want to be asked whenever you start Eclipse. You can always change workspace when Eclipse is running.

Click OK. You should see the welcome screen:

Eclipse welcome screen

Now, we are ready to create a Java project.

3. Change Perspective

Before creating a new Java project, let familiarize yourself with Perspective. Imagine a perspective is a predefined configuration specialized for a specific aspect of development process such as Java, Java EE, Debug, Database Development, Web, etc. Depending on your need, you can switch back and forth among different perspectives during a development session.

Since we installed Eclipse IDE for Java EE Developers, the default perspective is Java EE. To change perspective, go to Window > Perspective > Open Perspective > Other… You will see a small dialog listing all available perspectives:

Eclipse Perspectives

Here we choose Java perspective. Click OK. Here's how the Java perspective would look like:

Java perspective

4. Create a Java Project

To create a new Java project in Eclipse, go to File > New > Java Project. The New Java Project wizard dialog appears let you specify configurations for the project:

New Java Project Dialog

Enter project name: HelloWorld. Leave the rest as it is, and click Finish.

You should see the HelloWorld project is created in the Package Explorer view as following:

HelloWorld project

It's recommended to create a package for your project. Right click on the project, and select New > Package from the context menu:

Menu New Package

In the New Java Package dialog, enter the name your package. Here I enter net.codejava:

New Java Package

Click Finish. You should see the newly created package appears:

Newly created package

Now, it's time to create a Java class for your hello world application.

5. Write Your First Java Program

To create a new Java class under a specified package, right click on the package and select New > Class from the context menu:

Menu New Class

The New Java Class dialog appears, type the name of class as HelloWorld and choose the option to generate the main() method:

New Java Class

And click Finish. The HelloWorld class is generated like this:

New Class Generated Code

Now, type some code in the main() method to print the message "Hello World" to the console:

HelloWorld Class Code

That's it. We have created a Java hello world program using Eclipse IDE.

6. Compile, Build and Run Your First Java Program

By default, Eclipse compiles the code automatically as you type. And it will report compile errors in the Problems view at the bottom like this:

Problem compile error

If you want to disable automatically build feature, click the menu Project and uncheck Build Automatically:

Menu Project Build

However, it's strongly recommended to keep the auto build mode for it helps you detect errors instantly.

Now, let's run the hello world application. Click menu Run > Run (or press Ctrl + F11), Eclipse will execute the application and show the output in the Console view:

Run Hello World Program

That's it! The HelloWorld program has run and printed the output "Hello World" and terminates.

We hope this tutorial help you get started with Eclipse and Java easily. Thank you for reading.

What's next? I recommend you to continue with this article: Java OOP: Understand Classes and Objects

Watch this tutorial in video:

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.