去官网下载jdk linux rpm
sudo yum localinstall jdk-17_linux-x64_bin.rpm
sudo alternatives –config java #看看当前有几个版本 回车不变 输入序号选择
— 参考 未用过———-
vi /etc/profile
export JAVA_HOME=/usr/soft/jdk1.7.0_51
export JRE_HOME=/usr/soft/jdk1.7.0_51/jre
export PATH=$PATH:/usr/soft/jdk1.7.0_51/bin
export CLASSPATH=./:/usr/soft/jdk1.7.0_51/lib:/usr/soft/jdk1.7.0_51/jre/lib