IO流——通過緩衝區複製文本文件

/*
通過緩衝區複製一個.java文件。

*/
import java.io.*;

class  CopyTextByBuf
{
	public static void main(String[] args) 
	{
		BufferedReader bufr = null;
		BufferedWriter bufw = null;

		try
		{
			bufr = new BufferedReader(new FileReader("BufferedWriterDemo.java"));
			bufw = new BufferedWriter(new FileWriter("bufWriter_Copy.txt"));

			String line = null;

			while((line=bufr.readLine())!=null)
			{
				bufw.write(line);
				bufw.newLine();
				bufw.flush();

			}
		}
		catch (IOException e)
		{
			throw new RuntimeException("讀寫失敗");
		}
		finally
		{
			try
			{
				if(bufr!=null)
					bufr.close();
			}
			catch (IOException e)
			{
				throw new RuntimeException("讀取關閉失敗");
			}
			try
			{
				if(bufw!=null)
					bufw.close();
			}
			catch (IOException e)
			{
				throw new RuntimeException("寫入關閉失敗");
			}
		}
	}
}