第144題

Which capability exists only in java.io.BufferedWriter?
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.
答案：D
參考：10-5 多重串接

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什麼樣的能力只存在於BufferedWriter裡面,
可以換行 (new line) /n