Ubuntu 安装JDK18

1、打开官网

Java Downloads | Oraclehttps://www.oracle.com/java/technologies/downloads/2、复制下载地址

3、下载安装文件

sudo mkdir /usr/java #创建文件
sudo cd /usr/java #切换目录
sudo wget https://download.oracle.com/java/18/latest/jdk-18_linux-x64_bin.tar.gz #下载文件

4、配置环境变量

sudo vi /etc/profile

# 添加以下3行
export JAVA_HOME=/usr/java/jdk-18.0.1
export CLASSPATH=.:$JAVA_HOME/lib
export PATH=.:$JAVA_HOME/bin:$JAVA_HOME/lib:$PATH

source /etc/profile 

5、验证

java -version

6、更简单的方法

sudo apt install openjdk-11-jre-headless  # version 11.0.14.1+1-0ubuntu1
sudo apt install openjdk-17-jre-headless  # version 17.0.2+8-1
sudo apt install openjdk-18-jre-headless  # version 18~36ea-1
sudo apt install openjdk-8-jre-headless   # version 8u312-b07-0ubuntu1