Manual Uninstall
- Click Start.
- Select Settings.
- Select System.
- Select Apps & features.
- Select the program to uninstall and then click its Uninstall button.
- Respond to the prompts to complete the uninstall.
About This Article
- Open the terminal.
- Type "Sudo su" and press Enter.
- Enter the root password.
- Type "sudo updatedb" and press Enter to update the Java database.
- Type "locate openjdk" and press Enter to find the Java installation location.
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- You have to install the openjdk-8-jre : sudo apt-get install openjdk-8-jre.
- Next switch to the jre-8 version: $ sudo update-alternatives --config java There are 2 choices for the alternative java (providing /usr/bin/java).
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- Remove the Oracle's Java folder: sudo rm -r /usr/lib/jvm/java-11-oracle.
- Install OpenJDK 8 from APT: sudo apt install openjdk-8-jdk openjdk-8-jre.
- Confirm Java version using: java -version.
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- Remove the link from /etc/alternatives.
- Remove the relevant file from the admin directory. /var/lib/dpkg/alternatives/ on ubuntu (debian may be the same but check the man pages under the FILES section) /var/lib/alternatives/ on CentOS 6&7.
Manual Uninstall
- Click Start.
- Select Settings.
- Select System.
- Select Apps & features.
- Select the program to uninstall and then click its Uninstall button.
- Respond to the prompts to complete the uninstall.
1 Answer
- Remove the link from /etc/alternatives.
- Remove the relevant file from the admin directory. /var/lib/dpkg/alternatives/ on ubuntu (debian may be the same but check the man pages under the FILES section) /var/lib/alternatives/ on CentOS 6&7.
How to Update JDK on Oracle Enterprise Linux from Version 1.6 to
- Step 1: Download the JDK rpm from the following link:
- Step 2: The current JDK version is:
- Step 3: Run the following command to update the JDK:
- Step 4: Check the version:
- Step 5: So the version is still pointing to the old one.
- Step 5: Now it should point to the latest version:
How To Uninstall JDK From Linux ?
- Uninstall Oracle JDK. Remove The Link. First of all remove the alternatives by executing the following commands: $ sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk[version]/bin/java"
- Uninstall Openjdk. If you want to remove Openjdk only, execute the following command on terminal: $ sudo apt-get remove openjdk*
Generally speaking it should be safe to upgrade to the latest Java Runtime Environment (JRE) for your operating system, then uninstall previous releases using the "Java Uninstall Tool." The Java Uninstall Tool will automatically figure out which releases are no longer required and remove them for you.
How to uninstall Java then reinstall it - Windows
- First, open the Control Panel.
- When the Control Panel appears, select Apps from the Windows Settings screen.
- Scroll down and select Java from the Apps and Features screen and then click the Uninstall button.
- Click Yes to confirm the program uninstall.
There is no standard installation location for the JDK between UNIX/Linux systems. Historically it has been installed in one of the directories listed below. You can ask the system administrator to make sure that the latest version of the JDK is installed and tell you where it located.
To set the Java version interactively:
- Log in as root or use sudo .
- View the Java alternatives. $ sudo update-alternatives --config java.
- Select a Java version, at the prompt, type a number. Press enter to keep the default[*], or type selection number:
- Verify the switch, check the Java version. $ java -version.
Java is a programming language that developers use to create applications on your computer. Chances are you've downloaded a program that required the Java runtime, and so you probably have it installed it on your system. Java also has a web plug-in that allows you to run these apps in your browser.
Information
- Step 1: Uninstall current version of Java. Access the Control Panel: In Windows 7 select the Windows button, then select Control Panel.
- Step 2: Install desired version of Java. Go to Oracle's Java SE 8 Archive Downloads page and locate the desired version of Java.
If you do not have root access, install Java in your home directory or a subdirectory for which you have write permissions.
- Change to the directory in which you want to install. Type: cd directory_path_name.
- Move the . tar.
- Unpack the tarball and install Java. tar zxvf jre-8u73-linux-x64.tar.gz.
- Delete the . tar.
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- Start -> Control Panel -> System -> Advanced.
- Click on Environment Variables, under System Variables, find PATH, and click on it.
- In the Edit windows, modify PATH by adding the location of your jdk5/bin directory to the beginning.
- Close the window.
- Reopen Command prompt window, and run java -version.
Java is a programming language that's used to install and run programs. However, if Windows isn't running the latest version of Java, you may have trouble downloading new programs, or even opening some websites. To check which version of Java you're running, you'll need to use Windows 10's Command Prompt app.
The legitimate java plug-in is safe to install, but some websites use fake pop-up windows to trick you into downloading software that isn't actually java. You can download java from http://java.com/en/.
The latest version of Java is Java 14 or JDK 14 released on March, 17th 2020 (follow this article to check Java version on your computer). JDK 15 is in progress with early-access builds.
Java is a programming language that developers use to create applications on your computer. Chances are you've downloaded a program that required the Java runtime, and so you probably have it installed it on your system. Java also has a web plug-in that allows you to run these apps in your browser.
That is, ideally. Since JAVA relates to the applications that you have on your computer rather than your real hardware and OS, the answer to your questions is more defined by what applications you are actually running. If you are not running any JAVA applications, then you don't need JAVA on your machine.
If message "command not found" appears, JDK is NOT installed. Proceed to the "Step 2: Install JDK". If message "To open javac, you need a Java runtime" appears, select "Install" and follow the instructions to install JDK. Then, proceed to "Step 3: Write a Hello-world Java program".
The Java version can be found in the Java Control Panel. Under the General tab in the Java Control Panel, the version is available through the About section. A dialog appears (after clicking About) showing the Java version.
Uninstall Oracle JDK
- Remove The Link. First of all remove the alternatives by executing the following commands: $ sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk[version]/bin/java"
- Remove The Package. After removing link, remove the package inside /usr/lib/jvm/jdk[version] by executing following command:
To uninstall a particular package, as well as any packages that depend on it, run the following command as root : yum remove package_name… Similar to install , remove can take these arguments: package names.
Include the -e option on the rpm command to remove installed packages; the command syntax is: rpm -e package_name [package_name…] To instruct rpm to remove multiple packages, provide a list of packages you wish to remove when invoking the command.
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- Remove the Oracle's Java folder: sudo rm -r /usr/lib/jvm/java-11-oracle.
- Install OpenJDK 8 from APT: sudo apt install openjdk-8-jdk openjdk-8-jre.
- Confirm Java version using: java -version.
Install Java
- Step 1: Verify that it is already installed or not. Check whether Java is already installed on the system or not.
- Step 2: Download JDK. Click the below link to download jdk 1.8 for you windows 64 bit system.
- Step 3: Install JDK.
- Step 4 : Set the Permanent Path.
Uninstalling the JDK on macOS
- Go to /Library/Java/JavaVirtualMachines .
- Remove the directory whose name matches the following format by executing the rm command as a root user or by using the sudo tool: /Library/Java/JavaVirtualMachines/jdk-13. interim.update.patch.jdk.
Install Oracle JDK 8 on Linux
- Download the latest JDK(jdk-8u241-linux-x64.
- Open the terminal (Ctrl + Alt + T) and enter the following command.
- Enter the following command to change the directory.
- Extract the jdk-8u241-linux-x64.
- Enter the following command to open the environment variables file.
Linux
- Check if JAVA_HOME is already set , Open Console.
- Make sure you have installed Java already.
- Execute: vi ~/.bashrc OR vi ~/.bash_profile.
- add line : export JAVA_HOME=/usr/java/jre1.8.0_04.
- save the file.
- source ~/.bashrc OR source ~/.bash_profile.
- Execute : echo $JAVA_HOME.
- Output should print the path.
