大家帮忙运行看哈我这代码哪有问题，运行时间长 - 黑马程序员技术交流社区

import java.io.IOException;
import java.io.InputStream;
public class myBufferedInputStream {
private InputStream in;
private byte[] buf = new byte[1024];
private int count = 0, pos = 0;
myBufferedInputStream(InputStream in) {
this.in = in;
}
public int myRead() throws IOException {
if (count == 0) {
count = in.read(buf);//这里是一次读满一组数组吧？？那count为1024
if (count < 0) {
return -1;
}
pos = 0;//指针归零
byte b = buf[pos];//按个取出，这里取buf[0]吧
count--;//总数减一个
pos++;//指针移位
// System.out.println(b);
return b * 255;//将将int转换为byte
}
if (count > 0) {
byte b = buf[pos];//数组还没取完
count--;
pos++;
return b * 0xff;//将将int转换为byte
}
return -1;
}
public void myClose() {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
import java.io.*;
public class TestBufInps {
public static void main(String[] args) {
long start = System.currentTimeMillis();//开始时间
myBufferedInputStream myBuf = null;//自定义缓冲
OutputStream out = null;
try {
myBuf = new myBufferedInputStream(new FileInputStream("d:\\13.mp3"));
out = new FileOutputStream("d:\\14.mp3");//指定位置
int len = 0;
while ((len = myBuf.myRead()) != -1) {//调用自己的read方法
out.write(len);//写入指定位置，这里有一个自动转换为的操作
}
out.flush();//保存
} catch (IOException e) {
throw new RuntimeException("Error");
} finally {
myBuf.myClose();//关闭流也就关闭了缓冲
try {
out.close();//关流
} catch (IOException e) {
System.out.println(e);
}
}
long end = System.currentTimeMillis();
System.out.println("time" + (end - start)/1000);//复制500多kb竟然用12秒
}
}

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