tree 461f589dc48770429277f2348aa2061f4803e005
parent aca985512c98241dd38dfecc8e08f5a97c710bf5
author Changcheng Xiao <xchangcheng@google.com> 1551954198 +0100
committer Changcheng Xiao <xchangcheng@google.com> 1551960989 +0100

Update some code to respect some java best practices

This commit updates some code introduced by I977a77286f
to improve its readability and also honor some java best
practices, e.g.:
* explicitly prohibit inheritance if a class isn't
intended for that (Effective Java Item 19's advice:
design and document for inheritance or else prohibit it).
* Write unit tests in three sections, aka "arrange",
"act", "assert".

Change-Id: I8939370f16c2465c7ba102afd3877a31babd0c89