java - 如何在Ubuntu Linux上安装JDK(How to install the JDK on Ubuntu Linux)

Question

I am trying to install the Java Development Kit (JDK) on Ubuntu Linux distribution, but I am unable to install it.

(我正在尝试在Ubuntu Linux发行版上安装Java开发工具包 （JDK），但是无法安装它。)

What are the steps to install it on Ubuntu?

(在Ubuntu上安装它的步骤是什么？)

  ask by user2057084 translate from so

Answer 1

Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?

(请参阅询问Ubuntu问题如何为OpenJDK设置JAVA_HOME？)

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How to install Open JDK (Java developement kit) in Ubuntu (Linux)?

(如何在Ubuntu（Linux）中安装Open JDK （Java开发工具）？)

1. Open Terminal from Application Dash or press Ctrl + Alt + T

   (从Application Dash打开终端或按Ctrl + Alt + T)

2. Update repository:

   (更新存储库：)

    sudo add-apt-repository ppa:openjdk-r/ppa # only Ubuntu 17.4 and earlier sudo apt update 

3. Optional: To search available distributions of openjdk , use the following command:

   (可选：要搜索openjdk可用发行版，请使用以下命令：)

    apt search openjdk 

4. Install the appropriate version with the following command:

   (使用以下命令安装适当的版本：)

    sudo apt install openjdk-8-jdk sudo apt install openjdk-8-source #this is optional, the jdk source code 

5. For JAVA_HOME (Environment Variable) type command as shown below, in "Terminal" using your installation path...

   (对于JAVA_HOME （环境变量），请使用安装路径在“终端”中键入如下所示的命令...)

    export JAVA_HOME=/usr/lib/jvm/java-8-openjdk 

   (Note: /usr/lib/jvm/java-8-openjdk is symbolically used here just for demostration. You should use your path as per your installation.)

   (（注意： /usr/lib/jvm/java-8-openjdk在这里只是象征性地用于演示。您应该在安装时使用路径。）)

6. For PATH (Environment Variable) type command as shown below, in Terminal :

   (对于PATH （环境变量），在Terminal输入如下所示的命令：)

   export PATH=$PATH:$JAVA_HOME/bin

7. To check your installation:

   (要检查您的安装：)

   java -version