![]() ![]() Installing Oracle HotSpot JRE Downloading the Oracle HotSpot JRE binariesĭownload JRE binaries in. In the next step we’ll install Oracle HotSpot JRE. (Although the output may change in the future as new Java versions are promoted to LTS status, or the current LTS version receives updates.) OpenJDK 64-Bit Server VM (build 11.0.11+9-Ubuntu-0ubuntu2, mixed mode) OpenJDK Runtime Environment (build 11.0.11+9-Ubuntu-0ubuntu2) It should output the following: openjdk version "11.0.11" We can check if OpenJDK JRE was properly installed by running: java -version To install the OpenJDK JRE, we run: sudo apt install default-jre (Alternatively, you may opt to use a specific Java version, using for example the openjdk-11-jre package as updates are released for that version of the Java Virtual Machine, that packages will be updated, allowing you to stick to the latest and greatest update of one specific version of the Java language.) The default-jre is an excellent choice for most situations, thanks to the outstanding track of backwards compatibility of the Java Virtual Machine. Ubuntu offers the default-jre package, which is regularly updated to ship the latest version of the current OpenJDK JRE in Long Term Support (LTS). Moreover, the non LTS versions of Java are bringing a steady stream of innovation into the language, and also see some adoption. Nowadays, Java 11 is the current Long Term Support (LTS) version, but Java 8 is still widely used. With new versions of Java released every 6 months, there are multiple versions available for use. You need to open a new file ⇒ choose "Format" ⇒ "Make Plain Text" ⇒ Enter the source code ⇒ Save as " Hello.java ".Previous step Next step 2. (If you use Mac OS X's default text editor "TextEdit" (NOT recommended), Use a programming text editor (such as Sublime Text or Atom) to input the following source code and save as " Hello.java " under the directory " ~/myProject ".Hence, this new directory can be referenced as " ~/myProject ". In Mac OS X, the home directory of the current user canīe referenced as " ~ ". Create a directory called " myProject " under your home directory (Launch "Finder" ⇒ "Go" ⇒ "Home" Select "File" ⇒ "New Folder" ⇒ " myProject ").Display the location of Java Runtime which java ![]() Display the location of Java Compiler which javac Display the JDK version javac -version To verify your installation, open a "Terminal" and issue these commands.Follow the screen instructions to install JDK/JRE. Double-click the downloaded Disk Image (DMG) file.Under "Java Platform, Standard Edition" ⇒ "Java SE 11.0.Then, proceed to "Step 3: Write a Hello-world Java program". If message "To open javac, you need a Java runtime" appears, select "Install" and follow the instructions to install JDK.If message "command not found" appears, JDK is NOT installed.If the JDK version is prior to 1.8, proceed to Step 2 to install the latest JDK otherwise, proceed to "Step 3: Write a Hello-world Java If a JDK version number is returned (e.g., JDK x.x.x ), then JDK has already been installed.To check if JDK has been installed, open a "Terminal" (Search "Terminal" or Finder ⇒ Go ⇒ Utilities ⇒ Terminal) and issue this command: javas - version Step 1: Check if JDK has been Pre-Installed ![]()
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