IO流_转换流出现的原因及格式

package cn.itcast_01;import java.io.FileInputStream;import java.io.IOException;/* * 字节流读取中可能出现的小问题: */public class FileInputStreamDemo {public static void main(String[] args) throws IOException {// 创建字节输入流对象FileInputStream fis = new FileInputStream("a.txt");// 读取数据// int len = 0;// while ((len = fis.read()) != -1) {// System.out.print((char) len);// }byte[] bys = new byte[1024];int len = 0;while ((len = fis.read(bys)) != -1) {System.out.print(new String(bys, 0, len));}// 释放资源fis.close();}}