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