PrintWriter

/*
从键盘输入，输入到文件或者屏幕
*/
package printWriterDemo;
import java.util.*;
import java.io.*;
class PrintWriterDemo 
{
	public static void main(String[] args) throws IOException 
	{
           InputStream in=System.in;
	   InputStreamReader isr=new InputStreamReader(in);
	   BufferedReader bufr=new BufferedReader(isr);
           FileWriter fw=new FileWriter("a.txt");
	   PrintWriter out=new PrintWriter(fw,true);
	   String line=null;
	   while((line=bufr.readLine())!=null)
		{
		   if(line.equals("over"))
			   break;
		   out.println(line);
	    }
		bufr.close();
		out.close();
	}
}