Before installing OpenJDK 11, uninstall older Oracle Java versions:

This guide walks you through everything you need to know to safely download and install OpenJDK 11 on a 64-bit version of Windows 10.

Because OpenJDK is an open-source project, multiple vendors provide certified, ready-to-use builds. For Windows 10 64-bit, these are the most reliable options:

No-cost, multiplatform, production-ready distribution backed by Amazon.

This should output something similar to: openjdk version "11.0.2" 2020-01-14