From https://techtavern.wordpress.com/2014/03/25/portable-java-8-sdk-on-windows/
-
Download the Java 8 SDK for Windows from Oracle. You will get a file named like java-8-windows-x64.exe. (http://www.oracle.com/technetwork/java/javase/downloads)
-
Open the downloaded file with 7-Zip, which will show a single archived file named tools.zip.
-
Open the tools.zip from within 7-Zip.