what is the difference between openJdk and OracleJdk?

Answer 1

The OpenJDK is the open-source reference implementation of the language. The OracleJDK is an implementation of the OpenJDK, it includes everything in the OpenJDK and more. Moreover, it provides warranties and such (which are provided by oracle) and more features.

The main difference is that the OpenJDK is free, the OracleJDK is not. That being said both follow the Java language specifications and provide all the functions Java should have.

Answer 2

OpenJDK create new Java features, and Oracle sell it and pay for the development of it