How to Find Where Jdk Is Installed on My Windows MAChine

How do I find where JDK is installed on my windows machine?

If you are using Linux/Unix/Mac OS X:

Try this:

$ which java

Should output the exact location.

After that, you can set JAVA_HOME environment variable yourself.

In my computer (Mac OS X - Snow Leopard):

$ which java
/usr/bin/java
$ ls -l /usr/bin/java
lrwxr-xr-x  1 root  wheel  74 Nov  7 07:59 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java

If you are using Windows:

c:\> for %i in (java.exe) do @echo.   %~$PATH:i

How to know the jdk version on my machine?

you might need to add path in environment variables which you can find in Control Panel
open the Jdk where you installed and add until /bin in the path in environment variables.

Add until /bin in path variable in System Variables which is residing in Environment Variables.

Then do
java -version
which might show up.

If still problem persists, try restarting your pc and see.

How to locate my java jdk folder and edit the path variable - integration maven

Go to

 Start->Control Panel->System->Advanced System Settings->Environment Variable->user variables

Click on new button

give the

     variable name : JAVA_HOME
     variable value: C:\Program Files\Java\jdk1.6.0_32

in that way you setup your java home and try

Also make sure to take new command prompt after you did any changes in environment variables

Where does Windows keep JDK location reference?

How is Windows deciding what JDK to use?

Windows is NOT making decisions on its own. If you get version 10 information when you run java -version, it is because Windows is finding the folder containing java.exe corresponding to the version 10 first in the paths pointed to by the PATH environment variable. If you have installed Java using an installer, the installer would update the PATH variable for you. Check your PATH variable and you will see the Java 10 folder appearing there first and then Java 7 folder.

How to tell if JRE or JDK is installed

You can open up terminal and simply type

java -version // this will check your jre version
javac -version // this will check your java compiler version if you installed

this should show you the version of java installed on the system (assuming that you have set the path of the java in system environment).

And if you haven't, add it via

export JAVA_HOME=/path/to/java/jdk1.x

and if you unsure if you have java at all on your system just use find in terminal

i.e. find / -name "java"

Where is the Java SDK folder in my computer? Ubuntu 12.04

WAY-1 : Updated for the shortest and easy way

Below command will give you the path, But it will only work if java command is working in other words if java path is configured.

readlink -f $(which java)

Read more at Where can I find the Java SDK in Linux?

WAY-2 (Better than WAY-1) : Below answer is still working and try it if above command is not working
for you.

You need to dig into symbolic links. Below is steps to get Java directory

Step 1:

$ whereis java
java: /usr/bin/java /etc/java /usr/share/java

That tells the command java resides in /usr/bin/java.

Dig again:

Step 2:

$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2009-01-15 18:34 /usr/bin/java -> /etc/alternatives/java

So, now we know that /usr/bin/java is actually a symbolic link to /etc/alternatives/java.

Dig deeper using the same method above:

Step 3:

$ ls -l /etc/alternatives/java
lrwxrwxrwx 1 root root 31 2009-01-15 18:34 /etc/alternatives/java -> /usr/local/jre1.6.0_07/bin/java

So, thats the actual location of java: /usr/local/jre.....

You could still dig deeper to find other symbolic links.

Reference : where is java's home dir?

How do I find the path to the JDK downloaded on my mac?

/Library/Java/JavaVirtualMachines