Linux yum源安装Jdk1.8

# 检查是否已经存在java相关命令
rpm -qa|grep java
rpm -qa|grep jdk 
rpm -qa|grep gcj 
java
# 如果需要卸载 
rpm -qa | grep java | xargs rpm -e --nodeps

# 检索Java1.8源列表
yum list java-1.8* 

# 安装Java1.8
yum install java-1.8.0-openjdk* -y 

# 查询JAVA_HOME 
which java 

# 返回 
/usr/bin/java 

# ls -l命令 
ls -l /usr/bin/java 

# 返回 
lrwxrwxrwx 1 root root 22 Nov 13 14:37 /usr/bin/java -> /etc/alternatives/java 

# ls -l命令
ls -l /etc/alternatives/java 

# 返回 lrwxrwxrwx 1 root root 73 Nov 13 14:37 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-1.el7_9.x86_64/jre/bin/java 

# 则JAVA_HOME路径为：/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-1.el7_9.x86_64