看character，本来是int，但我换成字符包装，然后生成的文件不断增大，我想问

public static void demo_read() throws IOException{
FileInputStream fis=new FileInputStream("H://aa.txt");
BufferedInputStream bufis=new BufferedInputStream(fis);

    FileOutputStream fos=new FileOutputStream("J://copya.txt");
    BufferedOutputStream bufos=new BufferedOutputStream(fos);
    Character ch=0;
    while((ch=(char) bufis.read())!=-1){
        bufos.write(ch);

    }
    bufos.close();
    bufis.close();![![图片说明](https://img-ask.csdn.net/upload/201707/12/1499854827_785064.png)图片说明](https://img-ask.csdn.net/upload/201707/12/1499854817_119146.png)

}

为什么这个文件是0字符，但是点击属性一看文件大小在不断增长，已经到100多M了

https://blog.csdn.net/miachen520/article/details/51648875