Install the Java Software Development Kit

Before you can create and modify Java programs, you’ll need the Java Software Development Kit. You can download the kit (also known as Java SDK or JDK) for free from Oracle as a single installer file, which makes installation quick and easy. Learn the best way to download and install the Java Software Development Kit on your Windows, macOS, or Linux system.

Steps

Downloading the Java Software Development Kit

1. Navigate to http://www.oracle.com/technetwork/java/javase/downloads/index.html. You can download a simple Java Software Development Kit (JDK) installer for Windows, macOS, or Linux directly from Oracle.
2. Click the “Download” button beneath “JDK.” This will open a new page containing several download options.
3. Scroll to the latest version of Java SE Development Kit. You should always use the latest stable version of the toolkit. There may be more than one version listed, so look closely at the release number.
   • For example, if you are presented with JDK 8u101 and 8u102, choose 8u102.
4. Click “Accept License Agreement.” Before you can click the download link, you must accept the license agreement. The option is just beneath the JDK version number.
5. Click the download link next to your operating system. Once you click the link, follow the prompts to select a save location on your computer and start the download.
6. Install the JDK on your computer. See , , , or for help installing the kit.

Installing on macOS

1. Double-click the installer file you downloaded. After , double-click the downloaded file in the Downloads window of your web browser or in Finder.
2. Double-click the package icon to start the installer. This icon looks like an open box. The JDK installer will launch.
3. Click “Continue” on the Introduction window. Now you’ll see the Installation Type window.
   • If you see a window that says “Destination Select” after clicking continue, click “Install for all users of this computer.” Not all users will see this window.
4. Click “Install.” You will see a window that says “Installer is trying to install new software. Type your password to allow this.”
5. Sign in as an administrator. Type your administrator username and password into the provided blanks .
6. Click “Install Software.” This may take a few minutes, depending on the speed of your computer. When the confirmation window appears, you can close it.
7. Open the “Applications” folder on your Mac. Now you’ll run a quick test from a terminal window to make sure the installation was successful. You can get to this folder by clicking “Go” and selecting “Applications.”
8. Open the “Utilities” folder. Here you’ll see a list of system utilities.
9. Double-click the “Terminal” app. Now you’ll see the command prompt.
10. Type javac -version and press ⏎ Return. Just beneath the command you ran, you should see the JDK version number you installed (e.g. “1.8.0.1”). This means the installation was successful and you can get to your coding.
    • Once you’ve made sure the installation is successful, you can delete the DMG installer file you downloaded to conserve hard drive space.

Installing on Windows

1. Double-click the JDK installer file. Once you’ve , navigate to the download location you chose earlier to launch the installer.
2. Allow the app to make changes to your computer. Depending on your version of Windows, you may be prompted to give permission for JDK to install. Click “Yes” or “OK” when prompted, and the installer’s Welcome screen will appear.
3. Click “Next” to continue. Now you’ll move through a series of screens that will guide you through the JDK installation.
4. Click “Next” to accept the default installation settings. This will begin the installation, which may take a few minutes depending on your computer. The green progress bar will show the progress of the installation.
5. Click “Close” when the installation is complete. This button will not appear until the installer has finished.
6. Press ⊞ Win+X to launch the Power User menu. Now that the JDK is installed, you’ll need to tell Windows how to load it. A menu will appear at the bottom left area of the screen.
7. Click “System.” A screen with your system specs will appear.
8. Click the “Advanced System Settings” link. Now you’ll see the System Properties panel.
9. Navigate to the “Advanced” tab. You’ll see a few different areas where you can adjust various system settings.
10. Click the “Environment Variables” button. This new dialog box displays two separate areas—one for User Variables (settings specific to your user account) and another for system-wide settings (System Variables).
11. Double-click the "Path" variable under “System Variables.” Now you’ll add a new variable. Follow these instructions exactly, as there is no “undo” option.
12. Click “New” if you’re using Windows 10. This step only applies to Windows 10:
    • Type c:\Program Files\Java\jdk1.8.0_xx\bin (but replace the “8.0_xx” part with the version number you installed).
    • Click the “Move Up” button until the path you typed appears as the top of the list.
    • Click “OK.”
13. Set the variable in earlier versions of Windows. Skip this step if you’re using Windows 10. You should see the “Edit System Variable” window. Make the following changes to the “Variable value” field only (don’t delete what’s there though):
    • Type C:\Program Files\Java\jdk1.8.0_xx\bin (but replace the “8.0_xx” with the correct version number) in FRONT of the other directories.
    • Add a semicolon (;) to the very end of what you just typed, just like this: C:\Program Files\Java\jdk1.8.0_xx\bin;
    • There should be no space before or after the semicolon, so the entire line should look something like this: C:\Program Files\Java\jdk1.8.0_2\bin;C:\Program Files\Intel\xxx
    • Click “OK.”
14. Click “OK” until you’ve closed all open windows. The installation is complete.
15. Press ⊞ Win+R to launch the Run box. Now you’ll check to make sure the JDK path is correct.
16. Type cmd and press ↵ Enter. Now you’ll see a terminal window containing the command prompt.
17. Type path and press ↵ Enter. You should see the full path to the JDK that you entered earlier.
18. Type java –version and press ↵ Enter. The version of JDK you installed will now appear on the screen.
    • If either part of this command-prompt test does not produce results, you may need to load the new environment variables by rebooting the computer.

Installing from an Archive on Linux or Solaris

1. Open a terminal window. If you downloaded an archived tarball of the JDK (it ends with *.tar.gz), use this method to complete the installation.
   • This method assumes you know how to use basic Unix shell commands.
   • If you downloaded a .rpm package file instead of a tarball, see .
2. Navigate to the directory where you'd like to install the JDK. You can install the JDK in any directory for which you have “write” permissions. Note that only the root user can install the JDK to a system directory.
3. Move the *.tar.gz file to your current directory. Use the mv command to get the archive file into the correct directory.
4. Unzip and install the JDK. The command is different depending on your operating system (and in the case of Solaris, the processor type). Once installed, a new directory called "jdk<version>” will be created in the current directory. In these examples, replace the name of the *.tar.gz file with the name of the one you downloaded.
   • Linux: tar zxvf jdk-7u<version>-linux-i586.tar.gz
   • Solaris (SPARC): tar xf -
   • Solaris (x64/EM64T): tar xf -
5. Delete the *.tar.gz file. Use the rm command to delete the archive file if you want to conserve disk space.

Installing from a Package on Linux

1. Become root. If you're using an RPM-based Linux system (such as SuSE or RedHat), you can install the Java Development Kit from an RPM package. Make sure you've downloaded the You'll need to su to root (su root) so that you have the correct permission to install the package.
   • The file you downloaded should end with ".rpm"
   • This method assumes you know how to use basic Unix shell commands.
2. Remove earlier JDK package installations.
   • rpm -e <package_name>
3. Install the new package. You'll be using the "rpm" command again, but this time with different flags:
   • rpm -ivh jdk-7u<version>-linux-x64.rpm (replace "jdk-7u<version>-linux-x64.rpm" with the actual package name)
4. Delete the .rpm file. When the package is finished installing, you'll be returned to the command line. If you want to conserve disk space, you can delete the downloaded package file with the rm command.

Video

Template:Video:Install the Java Software Development Kit

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