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The Java Development Kit (JDK), officially named “Java Platform Standard Edition (Java SE)”, is required to write Java programs. Java Runtime (JRE) is required to run Java programs. JRE is included within the JDK along with other tools such as a compiler and debugger. Therefore the first step of writing a Java program, is to install the Java Development Kit. It’s important to always have an up-to-date version of JDK, which can be downloaded here. To jump to the right section for you, choose one of the following links:

Checking if you have it downloaded already

To check whether you already have a version of JDK, including JRE, downloaded, you’ll need to check on the command line. By typing:
> java -version
into the command line and pressing enter, you should get one of the following messages.
Something that looks like:

> java version '1.8.0_121'
 > Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
 > Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)

means you already have an up to date version of the JRE installed. This can be checked by looking at the version on the first line.

Jdk 1.8.0 121 Download For Mac 64-bit

To check the version of the JDK, that is needed to write Java programs, type: Jdk 1.8.0 121 Download For Mac

> javac -version
which will produce an output like: javac 1.8.0_121
If you do not get a message that looks like those above or get one that says command not found, you will need to install JDK before you can start writing and compiling Java programs. Choose an operating system below, and follow the instructions to get started.

Mac OSX

On some Mac systems, JDK has been pre-installed. So it’s important to double-check, as shown above, before trying to install another version.

Download the JDK from here
Double-click the Disk Image file in your Downloads folder and follow the instructions to install JDK/JRE.
Check using the methods above that the JDK is correctly installed (javac -version).
Start coding!

Linux – Ubuntu

There are several JDK implementations available for Linux and Ubuntu chooses OpenJDK as its default JDK. But we’re gonna choose the Oracle JDK 8, as in the other two sections on this page. Firstly you need to check, as above, whether there is an implementation of JDK installed. If OpenJDK is installed, you need to write the below into the command line: sudo apt-get purge openjdk-* Once this is completed, the next steps should be taken to install the Java Development Kit:

Download the JDK from here. Either the Linux x86 version for 32-bit systems or Linux x64 for 64-bit system “tar.gz” package.
We need to create a ‘Java’ directory within /usr/local/ directory and then move into that directory. This can be done as follows from the Terminal
cd /usr/local sudo mkdir java cd /usr/local/java
You then need to extract the jar file into the directory you have created using the following:
sudo tar xzvf ~/Downloads/filename.tar.gz Replacing filename with the name of the file you downloaded.
At this point, you should have two uncompressed binary directories in /usr/local/java. You now need to edit the system PATH file /etc/profile. sudo gedit /etc/profile
Scroll to the end of the file and copy/paste the following code in. Then save and exit.
JAVA_HOME=/usr/local/java/jdk1.8.0_20 JRE_HOME=/usr/local/java/jre1.8.0_20 PATH=$PATH:$JRE_HOME/bin:$JAVA_HOME/bin export JAVA_HOME export JRE_HOME export PATH
You now need to tell Ubuntu where your Oracle JDK files are, type the following into the Terminal:
sudo update-alternatives --install '/usr/bin/java' 'java' '/usr/local/java/jdk1.8.0_20/bin/java' sudo update-alternatives --install '/usr/bin/javac' 'javac' '/usr/local/java/jdk1.8.0_20/bin/javac' sudo update-alternatives --install '/usr/bin/javaws' 'javaws' '/usr/local/java/jdk1.8.0_20/bin/javaws'
Now you need to tell Ubuntu which JDK you want to be the default option:
sudo update-alternatives --set java /usr/local/java/jdk1.8.0_20/bin/java sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_20/bin/javac sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_20/bin/javaws
The next step is to reload your system wide PATH /etc/profile:
source /etc/profile
You can then check that it is installed properly using javac -version
Reboot your computer and start coding!

Windows

Download the JDK from here
Run the installer, accepting all the default options and following the on screen instructions
Using File Explorer, check the files that have been installed, taking note of the upgrade number for example jdk1.8.0_25
You will need to edit your PATH environment variable. For Windows 7/8/10, do the following:
Launch the Control Panel and choose the System and Security or System option. Click on Advanced System Settings.
Choose the Advanced table, and click the Environment Variable option
Under System Variables, scroll until you see the Path option and choose Edit
For Windows 10:
Click New for the table of existing PATH entries and enter the directory in which the JDK is in, for example
c:Program FilesJavajdk1.8.0_xxbin where xx is the two numbers you remembered earlier (for example 25)
For older Windows operating systems:
Put “c:Program FilesJavajdk1.8.0_xxbin”, replacing the xx as above, in the ‘Variable value’ in front of all the existing directories, followed by a semi-colon (;). Don’t delete any other existing entries as you may have other programs that use these!
Use javac -version to check that the JDK is installed correctly.
Start coding!

Now that you have installed the JDK, you can write your first Java program. You can learn exactly how to do that here!

This topic includes the following sections:

System Requirements for Installing the JDK on macOS

The following are the system requirements for installing the JDK on macOS:

Any Intel-based computer running macOS.
Administrator privileges.
You cannot install Java for a single user. Installing the JDK on macOS is performed on a systemwide basis for all users. Administrator privileges are required to install the JDK on macOS.

Determining the Default JDK Version on macOS

When starting a Java application through the command line, the system uses the default JDK.

There can be multiple JDKs installed on the macOS system.

You can determine which version of the JDK is the default by entering java -version in a Terminal window. If the installed version is 14 Interim 0, Update 0, and Patch 0, then you see a string that includes the text 14. For example:

To run a different version of Java, either specify the full path, or use the java_home tool. For example:

$ /usr/libexec/java_home -v 14 --exec javac -version

Installing the JDK on macOS

Download the JDK .dmg file, jdk-14.interim.update.patch_osx-x64_bin.dmg.
Before the file can be downloaded, you must accept the license agreement.
From either the browser Downloads window or from the file browser, double-click the .dmg file to start it.
A Finder window appears that contains an icon of an open box and the name of the .pkg file.
Double-click the JDK 14.pkg icon to start the installation application.
The installation application displays the Introduction window.
Click Continue.
Click Inst