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    Java

    Last updated: 2024-01-06 16:15:34
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      Java Development Kit (JDK) is the SDK for Java. This document takes JDK 1.7 and 1.8 as examples to describe how to install and configure JDK under Windows and Linux systems.

      Windows

      1. Downloading a JDK

      Go to the Oracle website to download the desired JDK version.

      2. Installation

      Install the JDK as instructed. You can specify the installation paths (C drive by default), for example, as D:\\Program Files\\Java\\jdk1.8.0_31 and D:\\Program Files\\Java\\jre1.8.0_31.

      3. Configuration

      After the installation is completed, right-click Computer, and then click Properties > Advanced system settings > Environment Variables > System variables > New to configure the software. Variable name (N): JAVA_HOMEVariable value (V): D:\\Program Files\\Java\\jdk1.8.0_31 (Configure according to your actual installation path).
      Variable name (N): CLASSPATHVariable value (V): .;%JAVA_HOME%\\lib\\dt.jar;%JAVA_HOME%\\lib\\tools.jar; (Note that the variable value begins with .). Variable name (N): Path Variable value (V): %JAVA_HOME%\\bin;%JAVA_HOME%\\jre\\bin;

      4. Testing

      Test whether the configuration is successful: click Start (or shortcut: Win+R) > Run (enter cmd) > OK (or press Enter), then enter the command javac and press Enter. If messages such as command parameters and syntax are displayed, the environment variables are configured successfully.

      Linux

      If openjdk is installed by using yum or apt-get command, the class library may be incomplete, thus leading to errors when you run relevant tools after the installation. Therefore, we recommend that you manually decompress and install JDK. Specific steps are as follows:

      1. Download a JDK

      Go to the Oracle website to download the desired JDK version to install.
      Note:
      The following uses jdk-8u151-linux-x64.tar.gz as an example. If you are using other versions, ensure that the extension is .tar.gz.

      2. Create a directory

      Run the following command to create the java directory in /usr/:
      mkdir /usr/java
      cd /usr/java
      Copy the downloaded jdk-8u151-linux-x64.tar.gz to the /usr/java/ directory.

      3. Decompress the JDK

      Run the following command to decompress the JDK:
      tar -zxvf jdk-8u151-linux-x64.tar.gz

      4. Set environment variables

      Edit the /etc/profile file. Add the following content to the profile file and save it:
      # set java environment
      JAVA_HOME=/usr/java/jdk1.8.0_151        
      JRE_HOME=/usr/java/jdk1.8.0_151/jre     
      CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
      PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
      export JAVA_HOME JRE_HOME CLASS_PATH PATH
      Note:
      JAVA_HOME and JRE_HOME should be configured according to the actual installation paths and JDK version.
      Run the following command for the modifications to take effect:
      source /etc/profile

      5. Test

      Run the following command to test the JDK installation:
      java -version
      If information about the Java version is displayed, the JDK is installed successfully.
      java version "1.8.0_151"
      Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
      Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)
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