System.out.println("Test BufferedWriter begin.");
        bufferedWriter.write("\n");
        for (int lineNum = startlineNum; lineNum < maxlineNum; lineNum *= Multiplying) {
            begin = System.currentTimeMillis();
            testBufferedWriter(lineNum);
            end = System.currentTimeMillis();
            long timeElapse_BufferedWriter = end - begin;
            bufferedWriter.write(String.valueOf(timeElapse_BufferedWriter)+"\t");
        }
        System.out.println("Test BufferedWriter end.\n");

        System.out.println("Test NewOutputStream begin.");
        bufferedWriter.write("\n");
        for (int lineNum = startlineNum; lineNum < maxlineNum; lineNum *= Multiplying) {
            begin = System.currentTimeMillis();
            testNewOutputStream(lineNum);
            end = System.currentTimeMillis();
            long timeElapse_NewOutputStream = end - begin;
            bufferedWriter.write(String.valueOf(timeElapse_NewOutputStream)+"\t");
        }
        System.out.println("Test NewOutputStream end.\n");

        System.out.println("Test NewBufferedWriter begin.");
        bufferedWriter.write("\n");
        for (int lineNum = startlineNum; lineNum < maxlineNum; lineNum *= Multiplying) {
            begin = System.currentTimeMillis();
            testNewBufferedWriter(lineNum);
            end = System.currentTimeMillis();
            long timeElapse_NewBufferedWriter = end - begin;
            bufferedWriter.write(String.valueOf(timeElapse_NewBufferedWriter)+"\t");
        }
        System.out.println("Test NewOutputStream end.\n");

        bufferedWriter.close();
    }

    /************************** I/O *****************************/
    //面向字节
    public static void testFileOutputStream (int lineNum) throws IOException {
        FileOutputStream fileOutputStream = new FileOutputStream(new File("./testFileOutputStream.txt"));
        while (--lineNum > 0) {
            fileOutputStream.write("写入文件Data\n".getBytes());
        }
        fileOutputStream.close();
    }