public class BufferedDemo {

public static void main(String[] args) throws FileNotFoundException {

// 记录开始时间

long start = System.currentTimeMillis();

// 创建流对象

try (

BufferedInputStream bis = new BufferedInputStream(new FileInputStream("jdk8.exe"));

BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("copy.exe"));

){

// 读写数据

int len;

byte[] bytes = new byte[8*1024];

while ((len = bis.read(bytes)) != -1) {

bos.write(bytes, 0 , len);

}

} catch (IOException e) {

e.printStackTrace();

}

// 记录结束时间

long end = System.currentTimeMillis();

System.out.println("缓冲流使用数组复制时间:"+(end - start)+" 毫秒");

}

}

// 缓冲流使用数组复制时间:666 毫秒