Finding JDK inside java installation folder on a linux machine

Question

I have been told that in a Linux machine java along with jdk has been installed in /usr/java path. But when I go to /usr/java/ i could so many files along with folder named bin,JRE. I want to know where is jdk installed here? Is bin folder itself is jdk?

Answer 1

My ls output for openjdk7 looks like this:

ASSEMBLY_EXCEPTION  docs     jre  man      THIRD_PARTY_README
bin                 include  lib  src.zip

The jre folder contains the JRE, the other files are part of the JDK, and not necessary for running Java applications which need only a JRE (eg the javac compiler in bin ).

Answer 2

打开终端并输入“ which java”，这将返回JDK安装路径

Answer 3

I guess you just installed the JDK under /usr/java. Try run ls /usr/java/bin , if java and javac is in /usr/java/bin, we can conclude that the /usr/java folder IS the JDK folder itself.