Chapter java development environment installation

1.windows install jdk

Webcast abound, not repeat them, refer to Baidu experience

2.linux install jdk

2.1. Check whether the system is installed java

[root@localhost home]# yum list installed | grep java

2.2. If you have an older version of java, you can use the following methods to uninstall java

[root@localhost home]# yum -y remove java-1.8.0-openjdk*

2.3. View a list of java package

[root@localhost home]# yum -y list java*

2.4. Java1.8 download and install all the packages, the way you need to enter y to confirm the download.

[root@localhost home]# yum installjava-1.8.0-openjdk*

2.5. Installed successfully, enter the following command to check whether the installation was successful, it returns the correct version number if the installation was successful.

[root@localhost home]#  java -version

2.6. The environment variable configuration
2.6.1 modify / etc / profile file, add JAVA_HOME

vi /etc/profile
#set java environment  
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el7_5.x86_64
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jar
export PATH=$PATH:$JAVA_HOME/bin
:wq
. /etc/profile    //使配置生效

2.7 verification

[root@localhost home]#  java -version
[root@localhost alternatives]# echo $JAVA_HOME

3.docker install jdk

1 Find jdk Mirror:

$ docker  search  jdk    

Openjdk Mirror 2 Download:

$  docker  pull  openjdk

3 runs jdk container:

$ docker  run  -d  -it  --name myopenjdk  openjdk  /bin/bash

4 into the container verification:

$ docker  exec  -it  myopenjdk  /bin/bash