How to Create a JAR File With Eclipse

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• Installing Eclipse
|
• Creating a JAR File
|
• Q&A

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This How.com.vn teaches you how to create a Java compressed folder, also known as a JAR file, using a free Java program called Eclipse. You can do this on both Windows and Mac computers.

Quick Steps

• Install the Java Developer's Kit and Eclipse.
• Place all files into the same folder.
• Open the folder in Eclipse and select all its contents.
• Click Export... and select JAR File.
• Select a save destination to export it.

Steps

Part 1

Part 1 of 2:

Installing Eclipse

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1. 
   1
   Make sure that you have the Java Developer's Kit installed. If you don't have the JDK installed on your computer, download and install it on your Windows or Mac computer before continuing.
2. 
   2
   Open the Eclipse website. Go to https://www.eclipse.org/.

   • If you already have Eclipse installed on your computer, skip to the next part.
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3. 3
   Click DOWNLOAD. It's a teal button near the top of the page.
4. 
   4
   Click DOWNLOAD. This orange button is near the top of the following page. Doing so will prompt Eclipse to download to your computer.
5. 
   5
   Wait for Eclipse to finish downloading. The download may take a few minutes.
6. 
   6
   Install the Eclipse installer. To do so:

   • Windows - Double-click the Eclipse setup file, then click Yes when prompted.
   • Mac - Double-click the Eclipse ZIP folder, then wait for the file to extract.
7. 
   7
   Open the Eclipse installer. Double-click the purple Eclipse icon when it appears. This will open the Eclipse installer.

   • If you clicked the Change Mirror link below the orange DOWNLOAD button earlier, Eclipse may instead open to the main program. If so, skip ahead to the "Click Browse" step.
8. 
   8
   Click Eclipse IDE for Java Developers. It's the top option in the Eclipse installer.
9. 
   9
   Click INSTALL. This yellow button is near the bottom of the page. Doing so will prompt Eclipse to begin installing onto your computer.

   • You can first change the installation folder by clicking the folder icon to the right of the "Installation Folder" field and then selecting a specific folder on your computer.
   • If you don't want to install shortcuts for Eclipse, uncheck the shortcut boxes before clicking INSTALL.
10. 
    10
    Click LAUNCH when it appears. This green button is at the bottom of the installer window. Clicking it will open Eclipse.
11. 
    11
    Click Browse…. It's on the right side of the window. A File Explorer (Windows) or Finder (Mac) window will open.
12. 
    12
    Select a workspace folder. Click a folder that you want to use on the left side of the screen. This is where your Eclipse project files will be stored.
13. 
    13
    Click Select Folder. It's in the bottom-right corner of the window.
14. 
    14
    Click Launch. You'll find this at the bottom of the window. Eclipse's main page will open.
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Part 2

Part 2 of 2:

Creating a JAR File

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1. 
   1
   Place all of your files in one folder. The files that you want to bundle into your JAR file all have to be in the same folder before you can continue.
2. 
   2
   Click File. It's in the top-left corner of the window (Windows) or in the top-left corner of the screen (Mac). A drop-down menu will appear.
3. 
   3
   Click Open File…. This option is near the top of the drop-down menu.
4. 
   4
   Open your files' folder. Go to the folder where the files that you want to use are, then double-click the folder to open it. You should see a list of the files in the window.
5. 
   5
   Select your folder's contents. Click a file, then press Ctrl+A (Windows) or ⌘ Command+A (Mac) to select all of the files in the folder.
6. 
   6
   Click Open. It's in the bottom-right corner of the window. Doing so will open your files in Eclipse.
7. 
   7
   Click File. The File drop-down menu will reappear.
8. 
   8
   Click Export…. It's near the bottom of the drop-down menu.
9. 
   9
   Double-click Java. This option is near the top of the page.
10. 
    10
    Click JAR file. It's below the Java item that you double-clicked.

    • If you want the JAR file to be executable like a program, click instead the Runnable JAR file option here.
11. 
    11
    Click Next. It's at the bottom of the window.
12. 
    12
    Select resources to export. Click the checkbox next to any unchecked resources that you want to package into your JAR file. You'll do this in the window at the top of the page.

    • Skip this step if you chose to create a runnable JAR file.
13. 
    13
    Select a save location. Click Browse…, type in a name for your file, click a folder in which you want to save the JAR file, and click Save.
14. 
    14
    Click Finish. Doing so will create your JAR file, though the compression process may take awhile.
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Community Q&A

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• Question

  How can I create a Java project that can be run with a single click?

  

  Community Answer

  You should create a runnable jar. You can do this with an IDE like eclipse. Go to Export >> Runnable jar -- then it will export your java project with a MANIFEST.MF file that specifies your main class. After that, you can simply run your runnable jar by double clicking.

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