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");
}

原文地址:https://www.cnblogs.com/liucong110/p/5402190.html