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萌新求指导  java课老师让把这段代码转换成字符流

import 导入FileInputStream类
import 导入FileOutputStream类
import *;//导入io包
    public class  FileStreamDemo {
      public static void main(String[] args) {
          int b = 0;
          FileInputStream in = null;//声明FileInputStream类的对象in
          FileOutputStream out = null;//声明FileOutputStream类的对象out
          try { in = new FileInputStream("user1.doc"); //
               out = new FileOutputStream("user1.txt");
                while((b=in.read())!=-1){
                       out.write(b); }
                       in.close();
                       out.close(); }
       catch (FileNotFoundException e) {//文件没有发现异常
              System.out.println("找不到指定文件");
              System.exit(-1);
                   }
       catch (IOException e1) {
             System.out.println("文件复制错误");
             System.exit(-1);
              }
             System.out.println("文件已复制");
      }
    }