How to Download and Install Java 8 on Your Computer
Java is one of the most popular programming languages in the world, used for developing applications for various platforms, such as desktop, web, mobile, and embedded devices. Java is also a platform-independent language, which means that you can run Java applications on any system that supports the Java Runtime Environment (JRE).
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In this article, we will show you how to download and install Java 8 on your computer, which is the latest long-term support (LTS) release of the Java platform. We will also cover some of the new features and benefits of Java 8, as well as some of the compatibility issues that you may encounter when upgrading from previous versions of Java.
Why Java 8?
Java 8 was released in March 2014 and introduced many new features and enhancements to the Java programming language and platform. Some of the most notable features include:
Lambda expressions: A concise way to write anonymous functions that can be passed as arguments or assigned to variables.
Method references: A shorthand notation for lambda expressions that only call an existing method.
Functional interfaces: Interfaces that have only one abstract method, which can be implemented by lambda expressions or method references.
Stream API: A new way to process collections of data in a declarative and functional way, using operations such as filter, map, reduce, and collect.
Default methods: Methods that provide a default implementation in an interface, which can be overridden by implementing classes.
Date/Time API: A new set of classes and interfaces for working with dates and times, based on the ISO-8601 standard.
Nashorn JavaScript Engine: A new engine for executing JavaScript code on the JVM, which can interoperate with Java objects and libraries.
Parallel Array Sorting: A new method for sorting arrays in parallel, using multiple threads for improved performance.
These features make Java 8 more expressive, concise, functional, and performant than previous versions of Java. They also enable developers to write more readable and maintainable code, as well as leverage the power of multicore processors and modern hardware.
System Requirements
Before you download and install Java 8 on your computer, you need to make sure that your system meets the minimum requirements for running the JRE. These requirements vary depending on your operating system and processor architecture. Here are some general guidelines:
Operating SystemProcessorRAMDisk SpaceBrowser
Windows 11 (64-bit only)Pentium 2 or higher128 MB124 MBInternet Explorer 9+, Microsoft Edge, Firefox, Chrome
Windows 10/8/7/Vista (32-bit or 64-bit)Pentium 2 or higher128 MB124 MBInternet Explorer 9+, Microsoft Edge, Firefox, Chrome
macOS 12/11/10.9+ (64-bit only)Intel Core or higherN/AN/ASafari
Linux (32-bit or 64-bit)Pentium 2 or higherN/AN/A "Next" to continue.
The installer will ask you to choose the features that you want to install. You can select or deselect the following options:
Development Tools: This includes the Java compiler, debugger, and other tools for developing Java applications.
Source Code: This includes the source code of the Java platform for reference and debugging purposes.
Public JRE: This includes the JRE that will be available for all users and browsers on your system.
You can also change the installation folder for the JRE by clicking on the "Change" button. Click on "Next" to continue.
The installer will show you a summary of your choices and the disk space required. Click on "Next" to start the installation.
The installer will copy the files and display a progress bar. Wait until the installation is complete.
The installer will show you a confirmation screen. Click on "Close" to exit the installer.
Setting the Environment Variables
After installing Java 8, you may need to set some environment variables to make sure that your system can find and run Java applications. These variables include:
JAVA_HOME: This is the path to the JDK installation folder, such as "C:\Program Files\Java\jdk1.8.0_301".
PATH: This is a list of paths where your system looks for executable files, such as "C:\Windows\System32". You need to add the path to the JDK bin folder, such as "C:\Program Files\Java\jdk1.8.0_301\bin", to this list.
CLASSPATH: This is a list of paths where your system looks for Java class files, such as "C:\MyProject\bin". You need to add the path to the JDK lib folder, such as "C:\Program Files\Java\jdk1.8.0_301\lib", to this list.
The steps for setting these variables may vary depending on your operating system and version. Here are some general guidelines:
Operating SystemSteps
Windows 11/10/8/7/VistaRight-click on the Start button and select "System".
Click on "Advanced system settings" on the left pane.
Click on "Environment Variables" on the bottom right corner.
In the "System variables" section, click on "New" to create a new variable, or click on "Edit" to modify an existing variable.
Enter the variable name and value, and click on "OK".
Repeat this process for each variable that you want to set or change.
Click on "OK" to close the dialog boxes.
macOS 12/11/10.9+Open a terminal window by pressing Command + Space and typing "Terminal".
Type "nano /.bash_profile" and press Enter to edit your bash profile file.
Type or paste the following lines at the end of the file, replacing the paths with your JDK installation folder:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=$JAVA_HOME/lib:.Press Control + O and Enter to save the file.
Press Control + X to exit the editor.
Type "source /.bash_profile" and press Enter to apply the changes.
Linux/SolarisOpen a terminal window by pressing Ctrl + Alt + T or clicking on the terminal icon.
Type "nano /.bashrc" and press Enter to edit your bashrc file.
Type or paste the following lines at the end of the file, replacing the paths with your JDK installation folder:
export JAVA_HOME=/usr/java/jdk1.8.0_301 export PATH=$JAVA_HOME/bin:$PATH export CLASSPATH=$JAVA_HOME/lib:.Press Control + O and Enter to save the file.
Press Control + X to exit the editor.
Type "source /.bashrc" and press Enter to apply the changes.
Verifying the Installation
To verify that you have successfully installed Java 8 on your computer, you can perform a simple test by running a Java command in a terminal or command prompt window. To do this, follow these steps:
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Open a terminal or command prompt window by pressing Ctrl + Alt + T on Linux or Windows, Command + Space and typing "Terminal" on macOS, or clicking on the terminal or command prompt icon on your system.
Type "java -version" and press Enter. This will display the version of Java that is installed on your system.
If you see something like "java version \"1.8.0_301\"", then you have successfully installed Java 8. If you see something else, such as an error message or a different version number, then you may have a problem with your installation or environment variables. You can try to reinstall Java 8 or check your environment variables again.
Updating Java 8
Java 8 is an LTS release, which means that it will receive updates and security patches until at least March 2025. It is important to keep your Java 8 installation up to date to ensure that it runs smoothly and securely. There are two ways to update Java 8 on your computer: from the Oracle website or from the Java.com website. Depending on how you installed Java 8, you can choose either option.
Checking for Updates
Before you update Java 8, you need to check if there are any updates available for your version. You can do this by using the Java Control Panel or by visiting the Java.com website. Here are the steps for each method:
MethodSteps
Java Control PanelOpen the Java Control Panel by clicking on the Start button and typing "Java" or by clicking on the Java icon in the system tray.
Click on the "Update" tab and then click on the "Update Now" button.
The Java Update Checker will launch and check for updates. If there are any updates available, it will prompt you to download and install them.
Java.com WebsiteGo to the and click on the "Do I have Java?" link.
The website will automatically detect your system and version of Java and tell you if there are any updates available. If there are, it will provide you with a download link.
Updating from Oracle Website
If you want to update the JDK from the Oracle website, follow these steps:
Go to the and click on the "JDK Download" button under "Java Platform (JDK) 8u301".
On the next page, scroll down to find the version that matches your system and click on the "Accept License Agreement" radio button.
Click on the download link next to your version and save the file to your computer.
The file name should be something like "jdk-8u301-windows-x64.exe" or "jdk-8u301-linux-x86.tar.gz", depending on your system.
Double-click on the installer file that you have downloaded and follow the same steps as described in the Installing Java 8 section.
The installer will overwrite your existing JDK installation with the updated version.
Updating from Java.com Website
If you want to update only the JRE from the Java.com website, follow these steps:
Go to the and click on the "Free Java Download" button.
The website will automatically detect your system and version of Java and provide you with a download link for the updated version. If it does not, you can click on the "See all Java downloads" link and select your version manually.
Save the file to your computer. The file name should be something like "jre-8u301-windows-x64.exe" or "jre-8u301-linux-x86.tar.gz", depending on your system.
Double-click on the installer file that you have downloaded and follow the same steps as described in the Installing Java 8 section.
The installer will overwrite your existing JRE installation with the updated version.
Compatibility Issues with Java 8
Java 8 is designed to be compatible with previous versions of Java, which means that most of the existing Java applications and libraries should work without any problems on Java 8. However, there may be some cases where you may encounter compatibility issues when upgrading from older versions of Java to Java 8. These issues can be classified into three categories: source, binary, and behavioral compatibility.
Source Compatibility
Source compatibility refers to the ability to compile Java source code on different versions of Java. Java 8 is mostly source compatible with previous versions of Java, except for some minor changes and restrictions. For example, you cannot use the keywords "default" and "lambda" as identifiers in Java 8, as they are reserved for new features. You also cannot use underscore "_" as a single-character identifier in Java 8, as it is reserved for future use.
If you encounter any source compatibility issues when compiling your code on Java 8, you may need to modify your code to comply with the new syntax and rules. You can also use the "-source" and "-target" options of the Java compiler to specify the source and target versions of Java that you want to use.
Binary Compatibility
Binary compatibility refers to the ability to run Java class files on different versions of Java. Java 8 is fully binary compatible with previous versions of Java, which means that any class file that was compiled on an older version of Java can run on Java 8 without any problems. However, this does not mean that the behavior of the class file will be exactly the same on different versions of Java, as there may be some behavioral differences due to changes in the implementation or specification of the Java platform.
Behavioral Compatibility
Behavioral compatibility refers to the consistency of the behavior and output of Java applications on different versions of Java. Java 8 is mostly behavioral compatible with previous versions of Java, except for some intentional changes and improvements. For example, some methods and classes in the Java API may have been modified, added, or removed in Java 8, which may affect the functionality or performance of your application. Some features and options of the JVM may have also changed in Java 8, which may affect the memory usage or garbage collection of your application.
If you encounter any behavioral compatibility issues when running your application on Java 8, you may need to adjust your code or configuration to adapt to the new behavior and output. You can also use the "-Xlint" option of the Java compiler to enable warnings for potential compatibility problems in your code.
Tips for Resolving Compatibility Issues
Here are some tips for resolving compatibility issues when upgrading from older versions of Java to Java 8:
Read the , which provides a comprehensive list of compatibility issues and solutions for migrating to Java 8.
Use a code analysis tool, such as , to detect and fix potential bugs and code smells in your code.
Use a testing tool, such as , to write and run unit tests and integration tests for your code.
Use a code coverage tool, such as , to measure and improve the quality and coverage of your tests.
Use a performance analysis tool, such as , to monitor and optimize the performance and memory usage of your application.
Use a refactoring tool, such as , to refactor your code and make use of the new features and enhancements of Java 8.
Use a version control system, such as , to track and manage the changes in your code.
Use a build tool, such as , to automate and manage the build process of your application.
Conclusion
In this article, we have shown you how to download and install Java 8 on your computer, as well as some of the new features and benefits of Java 8. We have also covered some of the compatibility issues that you may encounter when upgrading from previous versions of Java to Java 8, and some tips for resolving them.
We hope that this article has helped you to get started with Java 8 and enjoy its advantages. If you have any questions or feedback, please feel free to leave a comment below. Happy coding!
FAQs
Here are some frequently asked questions about Java 8:
What is the difference between Java 8 and Java 11?
Java 11 is the latest LTS release of the Java platform, which was released in September 2018. It introduces many new features and enhancements, such as local variable type inference, lambda parameter names, HTTP/2 client, dynamic class-file constants, and more. It also removes some features and options that were deprecated or obsolete in previous versions of Java, such as the Java EE modules, the JavaFX modules, the Nashorn JavaScript engine, and more. You can read more about the differences between Java 8 and Java 11 .
How can I uninstall Java 8 from my computer?
To uninstall Java 8 from your computer, you need to remove the JDK and/or JRE installation folders and files, as well as any environment variables that you have set for Java 8. The steps for uninstalling Java 8 may vary depending on your operating system and version. You can find the detailed instructions for uninstalling Java 8 on the .
How can I run multiple versions of Java on my computer?
If you need to run multiple versions of Java on your computer, you can install them in different folders and use different environment variables to switch between them. For example, you can have Java 8 installed in "C:\Program Files\Java\jdk1.8.0_301" and Java 11 installed in "C:\Program Files\Java\jdk-11.0.12". Then, you can use the JAVA_HOME, PATH, and CLASSPATH variables to point to the version that you want to use. You can also use tools such as to manage multiple versions of Java on your computer.
How can I learn more about Java 8?
If you want to learn more about Java 8, you can check out some of these resources:
: A comprehensive guide to learning the Java programming language and platform.
: The official documentation for the Java SE 8 platform, including the API reference, the language specification, the JVM specification, and more.
: A summary of the new features and enhancements introduced in Java SE 8.
: A guide to help developers migrate their applications from previous versions of Java to Java SE 8.
: A collection of best practices and tips for developing high-quality and performant applications using Java SE 8.
: A list of books that cover various aspects of Java SE 8, such as lambda expressions, streams, concurrency, performance, testing, design patterns, and more.
: A list of online courses that teach various topics related to Java SE 8, such as functional programming, parallel programming, reactive programming, microservices, and more.
: A list of blogs that provide useful information and insights about Java SE 8, such as news, tutorials, examples, opinions, reviews, and more.
How can I get help with Java 8?
If you need help with Java 8, you can use some of these resources:
: The official support service for Oracle customers who have purchased a license or subscription for Oracle products.
: A popular online platform where you can ask and answer questions about programming and technology.
: A social media website where you can join communities and discuss topics related to Java and programming.
: A question-and-answer website where you can ask and answer questions about anything, including Java and programming.
: A forum website where you can post and reply to threads about Java and related topics.
: A network of local groups of Java enthusiasts who organize events and activities to share knowledge and experience about Java and programming.
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