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I installed JDK using apt-get install but I don't know where my jdk folder is. I need to set the path for that. Does any one have a clue on the location?
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The JDK software is installed on your computer, for example, at C:\Program Files\Java\jdk1. 6.0_02.
Open command prompt and enter “java –version”. If installed version number is displayed. 2. On Windows, Java is usually installed in the directory C:/Program Files/Java.
OpenJDK 11 is located at /usr/lib/jvm/java-11-openjdk-amd64/bin/java. Oracle Java is located at /usr/lib/jvm/java-11-oracle/jre/bin/java .
Alternatively, you can use the whereis command and follow the symbolic links to find the Java path. The output tells you that Java is located in /usr/bin/java. Inspecting the directory shows that /usr/bin/java is only a symbolic link for /etc/alternatives/java.
This depends a bit from your package system ... if the java command works, you can type readlink -f $(which java) to find the location of the java command. On the OpenSUSE system I'm on now it returns /usr/lib64/jvm/java-1.6.0-openjdk-1.6.0/jre/bin/java (but this is not a system which uses apt-get).
On Ubuntu, it looks like it is in /usr/lib/jvm/java-6-openjdk/ for OpenJDK, and in some other subdirectory of /usr/lib/jvm/ for Suns JDK (and other implementations as well, I think).
Debian is the same.
For any given package you can determine what files it installs and where it installs them by querying dpkg. For example for the package 'openjdk-6-jdk': dpkg -L openjdk-6-jdk
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