Ubuntu 18.04.3安装jdk-8u241-linux-x64.tar.gz完成后提示Command 'java' not found

从官网下载了jdk-8u241-linux-x64.tar.gz这个版本,在opt路径下新建了jvm,将文件解压到了jvm下,然后在/etc/profile加入了
export JAVA_HOME=/opt/jvm/jdk1.8.0_241

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:＄{JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=＄{JAVA_HOME}/:$PATH
保存退出后执行让文件生效source /etc/profile
执行java --v出现
Command ‘java’ not found, but can be installed with:

sudo apt install default-jre
sudo apt install openjdk-11-jre-headless
sudo apt install openjdk-8-jre-headless

还是因为配置path原因:
export JAVA_HOME=/opt/jvm/jdk1.8.0_241

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/:${JAVA_HOME}/bin:$PATH

或者最后一个PATH改为:
export PATH=${JAVA_HOME}/:/opt/jvm/jdk1.8.0_241/bin:$PATH

执行source /etc/proflie 让文件立即生效
查询 java -version就ok了