?请教打印在屏幕上和文件中为什么结果不同呢

import java.io.*;public class TestFileOutPutStream {    public static void main(String[] args) {        int b = 0;        FileInputStream in = null;        FileOutputStream out = null;        try {            in = new FileInputStream("j:/TestFileOutPutStream.java");            out = new FileOutputStream("j:/TestFileCopy.java");            while((b=in.read())!=-1) {                //out.write(b);                System.out.print((char)b);            }            in.close();            out.close();        } catch(FileNotFoundException e) {            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");            }}