Io 读写text 文件一体化

package Io;
import java.io.*;
public class F {
public static void main(String[] args) throws IOException {
F  a =new F();
a.b();
//写文件
try {
FileWriter f =new FileWriter("D:\\rund.text");
f.write("asdadadad");
f.flush();

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//读文件
public void b() throws IOException{
FileReader fr =new FileReader("D:\\rund.text");
  char [] arr =new char[1024];
  int data=0;
  while((data=fr.read(arr))!=-1)
  {
                     //把数据查出来
  System.out.println(new String(arr,0,data));
  }

}
}