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();}}