linux 查看安装的是jdk还是jre

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首先要申明一下which java是定位不到安装路径的。which java定位到的是java程序的执行路径。网上的资料都是人云亦云，完全不去思考。那么怎么定位到java的安装路径呢？下面我们来看看例子吧,如下所示：
[root@localhost ~]# java -version

java version "1.7.0_65"

OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_ u65-b17)

OpenJDK -Bit Server VM (build 24.65-b04, mixed mode)

[root@localhost ~]# which java

/usr/bin/java

[root@localhost ~]# ls -lrt /usr/bin/java

lrwxrwxrwx. 1 root root 22 Aug 17 15:12 /usr/bin/java -> /etc/alternatives/java

[root@localhost ~]# ls -lrt /etc/alternatives/java

lrwxrwxrwx. 1 root root 46 Aug 17 15:12 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_/bin/java

[root@localhost ~]#

[root@localhost ~]# cd /usr/lib/jvm

[root@localhost jvm]# ls

java-1.6.0-openjdk-1.6.0.0.x86_ java-1.7.0-openjdk-1.7.0.65.x86_ jre jre-1.6.0 jre-1.6.0-openjdk.x86_ jre-1.7.0 jre-1.7.0-openjdk.x86_ jre-openjdk

[root@localhost jvm]#