IO中使用缓冲读写操作控制台数据的newLine()方法

本文通过一个具体的 Java 程序实例,详细介绍了如何使用 BufferedReader 和 BufferedWriter 类进行文本输入输出操作。特别强调了 BufferedWriter 中 newLine 方法的作用及使用时机的重要性。

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import java.io.*;
class IOTest5 
{
	public static void main(String[] args) throws Exception
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		//读控制台数据

		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		//将字符数据写到控制台

		String line = null;
		while((line = br.readLine()) != null)
		{
			if("stop".equals(line))
			{
				break;
			}
			bw.write(line);
			bw.newLine();//写入一个行分隔符。
			bw.flush();//当前行全部写完,刷新数据
			
		}
		
		br.close();
		bw.close();

	}
}


在这个过程中需要注意的是:

BufferedWriter 在写入每一行数据的时候,最后都会写入一个行分隔符,并且最后会一次刷新每一行的数据,这样数据就会正常按行分隔显示
<img src="data:image/png;base64,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" alt="" />
如果下面两行数据颠倒了写,
<pre name="code" class="java">bw.newLine();//写入一个行分隔符。
bw.flush();//当前行全部写完,刷新数据
则会出现


所以理解了<pre name="code" class="java">newLine()方法的意思就是比较重要了。





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