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");
}

第四次作业

原文：http://www.cnblogs.com/wsxzr/p/5470446.html