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  • ubuntu系统下Java环境JDK的安装

    Debian Linux下安装jdk

    下载压缩包

    官网下载对应的.gz包 点击下载

    解压文件

    创建一个目录用于存放解压后的文件,并解压缩到该目录下

    sudo mkdir  /opt/java8
    sudo tar -zxvf jdk-8u221-linux-x64.tar.gz -C  /opt/java8
    

    修改环境变量

    sudo vim ~/.bashrc

    进入文件,末尾追加如下内容:

    export JAVA_HOME=/opt/java8/jdk1.8.0_221      //这里要注意目录要换成自己解压的jdk目录
    export JRE_HOME=${JAVA_HOME}/jre  
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
    export PATH=${JAVA_HOME}/bin:$PATH
    

    使环境变量生效

    source ~/.bashrc
    

    设置系统默认jdk

    sudo update-alternatives --install /usr/bin/java java /opt/java8/jdk1.8.0_211/bin/java 300  
    sudo update-alternatives --install /usr/bin/javac javac /opt/java8/jdk1.8.0_211/bin/javac 300  
    sudo update-alternatives --install /usr/bin/jar jar /opt/java8/jdk1.8.0_211/bin/jar 300   
    sudo update-alternatives --install /usr/bin/javah javah /opt/java8/jdk1.8.0_211/bin/javah 300   
    sudo update-alternatives --install /usr/bin/javap javap /opt/java8/jdk1.8.0_211/bin/javap 300
    

    然后执行:

    sudo update-alternatives --config java
    

    测试是否安装成功

    java -version
    

    突发情况

    Ubuntu的桌面不显示任何的快捷方式,而且不能往桌面上移动文件和目录。最简单的是重载桌面。 进入终端,执行以下命令:

    sudo apt-get update
    sudo apt-get install --reinstall ubuntu-desktop
    sudo apt-get install unity
    sudo shutdown -r now
    
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  • 原文地址:https://www.cnblogs.com/victorfengming/p/11930912.html
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