技術標籤：java

public class CopyAviDemo {
    public static void main(String[] args) throws IOException {
        long startTime01 = System.currentTimeMillis();
        method01();
        long endTime01 = System.currentTimeMillis();
        System.out.println("1.耗時：" + (endTime01 - startTime01)
 
 + "秒");
        long startTime02 = System.currentTimeMillis();
        method02();
        long endTime02 = System.currentTimeMillis();
        System.out.println("2.耗時：" + (endTime02 - startTime02) + "秒");
        long startTime03 = System.currentTimeMillis();
        method03
 
();
        long endTime03 = System.currentTimeMillis();
        System.out.println("3.耗時：" + (endTime03 - startTime03) + "秒");
        long startTime04 = System.currentTimeMillis();
        method04();
        long endTime04 = System.currentTimeMillis();
        System.out.println("4.耗時："
 
 + (endTime04 - startTime04) + "秒");
    }

    public static void method01() throws IOException {
        FileInputStream fis = new FileInputStream("E:\\練習用\\cc01.avi");
        FileOutputStream fos = new FileOutputStream("com.idea_primary\\位元組流位元組複製.avi");
        int i;
        while ((i = fis.read()) != -1) {
            fos.write(i);
        }
        fis.close();
        fos.close();
    }
    public static void method02() throws IOException {
        FileInputStream fis = new FileInputStream("E:\\練習用\\cc02.avi");
        FileOutputStream fos = new FileOutputStream("com.idea_primary\\位元組流位元組陣列複製.avi");
        int i;
        byte[] b = new byte[1024];
        while ((i = fis.read(b)) != -1) {
            fos.write(b,0,i);
        }
        fis.close();
        fos.close();
    }
    public static void method03() throws IOException {
        FileInputStream fis = new FileInputStream("E:\\練習用\\cc03.avi");
        BufferedInputStream bis = new BufferedInputStream(fis);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("com.idea_primary\\緩衝流位元組複製.avi"));
        int i;
        while ((i = bis.read()) != -1) {
            bos.write(i);
        }
        bis.close();
        bos.close();
    }
    public static void method04() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\\練習用\\cc01.avi"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("com.idea_primary\\緩衝流位元組複製.avi"));
        byte[] b = new byte[1024];
        int i;
        while ((i = bis.read(b)) != -1) {
            bos.write(b,0,i);
        }
        bis.close();
        bos.close();
    }
}

輸出臺輸出：
1.耗時：33525秒
2.耗時：120秒
3.耗時：256秒
4.耗時：17秒

結論：
緩衝位元組流 > 基本位元組流
一次讀取一個位元組陣列 > 一次讀取一個位元組