JAVA环境安装

可以访问https://download.oracle.com，找最新版本的JDK
wget https://download.oracle.com/java/17/archive/jdk-17.0.1_linux-x64_bin.tar.gz
mkdir -p /usr/local/java
tar -zxvf openjdk-21.0.2_linux-x64_bin.tar.gz -C /usr/local/java/

永久更改环境变量

vi /etc/profile

export JAVA_HOME=/usr/local/java/jdk-21.0.2
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

source /etc/profile

临时更改环境变量

export JAVA_HOME=/usr/local/java/jdk17
export PATH=$JAVA_HOME/bin:$PATH
source /etc/profile

验证安装是否成功

java -version
javac -version