java第四次作业

/**
* @param args
*/
public static void copy(File a,File b){
try {
FileInputStream fis = new FileInputStream("a.mp3");
FileOutputStream fos = new FileOutputStream("temp.mp3");
byte[] buf = new byte[1024];
int len;
int read = fis.read();
while((len = fis.read(buf))!=-1){
fos.write(buf, 0, len);
}
fis.close();
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
File a = new File("");
File b = new File("");
long start,end;
start = System.currentTimeMillis();
copy(a,b);
end = System.currentTimeMillis();
System.out.println("复制所用时间：" + (end - start) + "ms");
}