Answer:
Yes.
Yes.
Class FileWriter is used for output of character data to a disk file. Here is where it is in the hierarchy of Writer classes:
The arrows in this diagram show inheritance.
A FileWriter is a kind of OutputStreamWriter,
which is a kind of Writer, which is a kind of Object.
When you read Java documentation,
you might need to look at several ancestors of a class you are interested in.
Say that OutputStreamWriter has several methods you would like to use.
Will a FileWriter object have these methods?