方法1
echo $JAVA_HOME
如果配置了系统就会输出配置为JAVA_HOME的jdk的的位置,如果没有配置就没有输出,推荐使用方法2
方法2(推荐)
关键命令分别为
1. which java
2. ls -lrt /usr/bin/java (路径依照自己的输出灵活去改)
3.ls -lrt /etc/alternatives/java (路径依照自己的输出灵活去改)
douhuang@douhuang-PC:~/Desktop$ java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-8u212-b01-1~deb9u1-b01)
OpenJDK 64-Bit Server VM (build 25.212-b01, mixed mode)
douhuang@douhuang-PC:~/Desktop$ which java
/usr/bin/java
douhuang@douhuang-PC:~/Desktop$ ls -lrt /usr/bin/java
lrwxrwxrwx 1 root root 22 5月 2 18:51 /usr/bin/java -> /etc/alternatives/java
douhuang@douhuang-PC:~/Desktop$ ls -lrt /etc/alternatives/java
lrwxrwxrwx 1 root root 46 5月 2 18:51 /etc/alternatives/java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
可以看到Java的安装路径为:/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java