JDK的安装于配置

一、JDK1.8 linux 安装

1、下载JDK： jdk-8u131-linux-x64.tar.gz
2、tar -zxvf  jdk-8u131-linux-x64.tar.gz
3、mv  jdk1.8.0_131 /usr/java/
4、cd /usr/java 
5、ln -s jdk1.8.0_131 default

###java home 配置
6. export JAVA_HOME=/usr/java/default >> /etc/profile
7. export PATH=$PATH:$JAVA_HOME/bin >> /etc/profile
8. source /etc/profile 
9.java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

  一、JDK1.11 linux 安装

1、下载JDK：jdk-11.0.4_linux-x64_bin.tar.gz
2、tar -zxvf  jdk-11.0.4_linux-x64_bin.tar.gz
3、mv ./jdk-11.0.4/ /usr/java/
4、cd /usr/java 
5、ln -s jdk-11.0.4 default
###java home 配置
export JAVA_HOME=/usr/java/default >> /etc/profile
export PATH=$PATH:$JAVA_HOME/bin >> /etc/profile
source /etc/profile 
java -version

java version "11.0.4" 2019-07-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.4+10-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.4+10-LTS, mixed mode)