单选题Which capability exists only in java.io.FileWriter？（）A Closing an open stream.B Flushing an open stream.C Writing to an open stream.D Writing a line separator to an open stream.
题目
单选题
Which capability exists only in java.io.FileWriter？（）
A
Closing an open stream.
B
Flushing an open stream.
C
Writing to an open stream.
D
Writing a line separator to an open stream.