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java中\r与\n还有\r\n的区别

\r 叫回车 Carriage Return
\n 叫新行 New Line
但是都会造成换行

使用 System.getProperty("line.separator")来获取当前OS的换行符
各系统应当是:
\r Mac
\n Unix/Linux
\r\n Windows

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