I want to use it. But I don’t understand the case at all, there is no api description, and the javadoc is bad

I did not find any helpful examples in the examples, how to set password login, how to set up key file for login verification, I really don’t understand what this is doing, I can understand the code of jsch at a glance, I know it is in jsch How to configure the local key file or password, but jsch does not support the new openSSH key file, so that I want to switch to this toolkit. However, I am completely confused by the documentation and the case. I did not find how in the case Set the password and verify the ssh login, I also did not search the website how to use sshj