How to find out the embedded JDK version of Android Studio?

The embedded JDK is included in the Android Studio install. If you open the folder where you installed Android Studio, you'll see a jre folder in it:

Inside the folder there is a file called THIRD_PARTY_README in which the second sentence says:

%% This notice is provided with respect to ASM Bytecode Manipulation 
Framework v5.0.3, which may be included with JRE 8, and JDK 8, and 
OpenJDK 8.

I'm using Android Studio 3.0, in which the embedded JDK version is 8. To find the version in any later version though, go to [SDK_INSTALL_ROOT]/jre/ and find THIRD_PARTY_README

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THIRD_PARTY_README is in my system defined as a file and not a txt file. You can open it in Notepad, Notepad++ or any other text editor. The content is plain text. You can also look for a file called release, which contains similar information about versions.

In the installation directory of Android Studio there is a "release" file where you will find the detailed java information.

Contents of C:\...\Android Studio\jre\release :

JAVA_VERSION="1.8.0_242"
OS_NAME="Windows"
OS_VERSION="5.2"
OS_ARCH="amd64"
SOURCE=""