How to set Java alternatives in Ubuntu?

Setting Java alternatives in Ubuntu is a relatively straightforward process. The first step is to make sure that you have the required Java runtime environment (JRE) and JDK (Java Development Kit) installed.

It is highly recommended that you have a compatible version of the JRE and JDK available.

Once the required programs are installed, you can begin the process of setting the Java alternatives. To do so, you will need to use the apt-get command line program. The following command will tell apt that you want to set the default Java for your computer:

$ sudo update-alternatives –config java

This command will list out the available versions of Java on your system and allow you to select which one you would like to use as the default. Once you have selected the version of Java, you will then need to use the following command to set the PATH environment variable to that specific version of Java:

$ sudo update-alternatives –set java

Once that is done, you can then check to make sure that the change has taken effect by entering this command:

$ which java

This command should return the path of the java executable which is the chosen alternative for the system. Additionally, you can test that the correct version of Java is in use by using the Java’s version command:

$ java -version

This command should return the version of Java that has been set as the alternative. After that, you should be done setting the Java alternatives and be able to use the newly set version of Java.

How do I set JAVA_HOME in Linux?

Setting the JAVA_HOME in Linux is different depending on your Linux distribution and JDK version.

If you’re using Ubuntu/Debian/Mint with OpenJDK 11, this can be done by creating a new environment variable in the ~/.profile file:

1. Open a terminal and type in the following command: `sudo gedit ~/.profile`

2. Find the line `JAVA_HOME=` and insert the path to the Java installation directory. For example, for OpenJDK 11 it would be: `JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64`

3. Save the changes and close the file.

4. Type in the terminal: `source ~/.profile` to enable the changes.

If you’re using another distribution, the process is similar and the only difference is the path. To find out the path you can use the `update-alternatives` command to list the available Java implementations and possible paths:

1. Type into the terminal `sudo update-alternatives –config java`

2. This will list all available Java implementations and the paths. Choose the one you want to use and copy the path.

3. Follow the steps above and add the path to the ~/.profile file and enable the changes.

After you have successfully set your JAVA_HOME environment variable, you can type `echo $JAVA_HOME` to verify that everything was set up correctly. If you see the path you specified, it means the environment variable was successfully set.

How do you JAVA_HOME is set to the location of your JDK?

To set the JAVA_HOME environment variable to the location of your JDK, you must first determine where your JDK is located. This is typically in a folder like C:\Program Files\Java\jdk# (where # is the version number).

Once you have found the JDK directory, you can set the environment variable. On Windows, this is done by going to Control Panel → System and Security → System → Advanced System Settings → Environment Variables → System Variables.

Then add or edit the JAVA_HOME environment variable and set it to the JDK directory. On Mac and Linux systems, you can set JAVA_HOME using the terminal. In the terminal, enter the following command, making sure to replace the text between the quotes with the path to your JDK:

export JAVA_HOME=”path-to-JDK”

How do I permanently set my JDK path?

To permanently set the JDK path, you will need to add a few environment variables. First, locate and note the path of your JDK installation. Then, access the Environment Variables section in the Windows Control Panel.

You will need to create a new user/system variable called “JAVA_HOME”, and set its value to the path of the JDK installation. Create a new user/system variable called “PATH” and edit its value to include the %JAVA_HOME%\bin and %JAVA_HOME%\jre\bin at the beginning.

If a “PATH” variable already exists, you will need to prepend the bin and jrebin folder paths to the beginning, separated by a semicolon from the preceding paths. Lastly, open a new Command Prompt window and type echo %JAVA_HOME% to test if the Java path was successfully set.

When done, save all your changes and close.

What is apt-get alternative Linux?

The apt-get alternative Linux command is known as “yum”. Yum is a package manager that acts as an automated installer and package updater for software packages in Linux systems. It is similar to apt-get and was designed to provide a simpler way to manage installation and updating of software packages in Linux environments.

Yum supports the RPM Package Manager, allowing software packages to be easily installed, upgraded, or deleted with a few simple commands. It provides a centralized access point to a variety of software packages, enabling users to easily gather, update, and uninstall packages from one place.

For example, typing the following command will allow a user to view available software packages:

`yum list available`

Yum also supports powerful search options, allowing users to quickly search for specific packages, or search by package name, version, architecture, or repository. Additionally, the yum command provides a number of options for managing the system, including installing, removing, or updating packages, configuring repositories, and running system maintenance tasks.

What are the alternative of screen in Linux?

Alternative displays for Linux include the command-line interface (CLI), the graphical user interface (GUI), virtual consoles, and ttys. The command-line interface is a text-based interface through which users can interact with the system.

The graphical user interface is a user-friendly graphical interface, which is the most common way of interacting with Linux systems. Virtual consoles allow users to switch between multiple command-line sessions simultaneously and the tty interface, which is a traditional character-based terminal emulator.

Other alternatives include remote desktop protocols such as VNC and SSH, which allow users to access their Linux machine from another system to control the hardware.

Is there Java for Ubuntu?

Yes, there is Java available for Ubuntu. Oracle Java is the preferred method of installing Java on Ubuntu, as it is the most up-to-date version currently available. Oracle Java can be installed via a one line command in terminal, and this command will download and install all necessary Java components.

Additionally, OpenJDK is another popular version of Java that is available for Ubuntu and can be installed using the Ubuntu package manager. Furthermore, Ubuntu also has a number of Java development tools available in its repositories, such as the Eclipse IDE and Apache Ant.

This allows developers to easily create, compile and run Java applications on the Ubuntu platform.

Can we install Java in Ubuntu?

Yes, you can install Java in Ubuntu. You can install the Java Runtime Environment (JRE), or the Java Development Kit (JDK). The JRE provides access to some of the features of Java, whereas the JDK provides the full functionality of Java.

To install either the JRE or the JDK on Ubuntu you will need to access a terminal window. You can do this by pressing “Ctrl+Alt+t”. Once the terminal window is open you will need to enter the following command “sudo apt-get install openjdk-7-jre” replacing “openjdk-7-jre” with the type of package you want to install.

If you want the JDK then you should use the command “sudo apt-get install openjdk-7-jdk”. Once the installation has completed you can perform the command “java -version” to check that installation has been successful.

Does Ubuntu 20.04 have Java?

Yes, Ubuntu 20. 04 has Java installed. Java comes pre-installed with the Ubuntu 20. 04 operating system. You can find the version of Java that is installed with the command ‘java -version’. To check if Java is installed on your system, open a terminal window and enter the command ‘java -version’.

If Java is installed, the system will display the version number. If you do not have Java installed, you can install it from the Ubuntu Software Center or from the command line. To install from the command line, you can use the following command: “sudo apt-get install default-jre”.

Once installed, you can check if the correct version of Java is installed by running the command “java -version” again. You can also upgrade existing Java installations with the command “sudo apt-get upgrade” or “sudo apt-get dist-upgrade”.

Which Java version should I use Ubuntu?

In general, the best Java version to use for Ubuntu is the latest long-term support (LTS) version, which at this time is Java 11. However, if you’re interested in the most up-to-date Java features or if you’re developing with cutting-edge technologies, you may want to consider using the latest general availability (GA) version of Java, which is currently Java 14.

Regardless of which version you use, ensure that you use the official OpenJDK packages for Ubuntu. These packages are maintained by the Ubuntu developers and provide the most secure, stable, and easy to install version of Java on Ubuntu.

You can easily install either version by following the instructions on OpenJDK’s official website. Be sure to check the website periodically for the latest version information, as well as security updates.

Is Java available for Linux?

Yes, Java is available for Linux. Java can be installed on Linux platforms, such as Ubuntu, Fedora and openSUSE, using the Linux Java Runtime Environment (JRE) or the Java Development Kit (JDK). The Java version available will depend on the version of the Linux platform that you’re using.

You don’t need to download Java separately, as it will come bundled with most versions of Linux. However, you can always download the latest version from Oracle’s Java download page. When installing Java on a Linux system, it’s best to use the Package Manager included in the Linux distribution and follow the instructions given there for installing Java.

In some cases, it’s also possible to install Java from the command line.

How to install Java on Linux terminal?

Installing Java on Linux terminal is a relatively straightforward yet detailed process. To begin, you’ll need to download and install the Java JDK (Java Development Kit) from Oracle’s website. You should choose the appropriate download option according to your system: Linux x64 for 64-bit devices, or Linux x86 for 32-bit devices.

After downloading, use the ‘tar -xzf’ command to extract the archive and install the package, being sure to replace the filename with the name of the downloaded JDK folder.

Next, you’ll need to set up the environment for Java. To do this, open the profile file in the ‘/etc/profile’ directory, and add the following lines:


export JAVA_HOME=$HOME/java/jdk-version

export PATH=$PATH:$JAVA_HOME/bin


Be sure to replace ‘version’ with the version of your Java installation, as well as insert the correct directory of your JDK installation. After saving your profile, restart your system and Java should be installed properly.

Congratulations – you have successfully installed Java on your Linux terminal!.

Categories FAQ

Leave a Comment