IO流中将字节流转成字符流的方法

public class TestIO {
 public static void main(String[] args) throws IOException {
  FileInputStream fis = new FileInputStream("c:/abc.txt");// 字节流
  InputStreamReader isr = new InputStreamReader(fis);// 字符流
  BufferedReader br = new BufferedReader(isr);// 缓冲流
  String str = null;
  if ((str = br.readLine()) != null) {
   System.out.println(str);
  }
  br.close();
  isr.close();
  fis.close();
 }

}
public class TestIO {
 pu