关于自定义字节缓冲区问题 - 黑马程序员技术交流社区

import java.io.*;
class MyBufferedInputStreamDemo
{
public static void main(String[] args) throws IOException
{
MyBufferedInputStream bis = new MyBufferedInputStream(new FileInputStream("touxiang.jpg"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("copy2.jpg"));
int b = 0;
while((b=bis.read())!=-1){
bos.write(b);
}
bis.close();
bos.close();
}
}
class MyBufferedInputStream
{
private InputStream is;
private byte[] buf = new byte[1024];
private int pos=0,count=0;
public MyBufferedInputStream(InputStream is){
this.is = is;
}
public int read()throws IOException{
if(count ==0){
count = is.read(buf);
if(count==-1)
return -1;
pos = 0;
}
count--;
return buf[pos++]&255;
}
public void close()throws IOException{
is.close();
}
}

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