Users can stream the output data into a string, an internal buffer, the standard output, or a file.
用户可以使这些输出数据流入字符串、内部缓冲区、标准输出或文件。
The data obtained is a stream of characters, which are appended in a String.
所获得的数据是一个字符流，这个多字符流附加在String中。
The data obtained is a stream of characters, which are appended in a String.
所获得的数据是一个字符流，这个多字符流附加在String中。
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