int times = 10000000;

        Byte[] li = new Byte[times];

        for (int i = 0; i < times; i++) {

            li[i] = (byte) i;

        }

        long timeA = System.currentTimeMillis();

        for (int i = 0; i < times; i++) {

            li[i].toString();

        }

        long timeB = System.currentTimeMillis();

        for (int i = 0; i < times; i++) {

            String.valueOf(li[i]);

        }

        long timeC = System.currentTimeMillis();

        System.out.println("A方法耗时：" + (timeB - timeA));

        System.out.println("B方法耗时：" + (timeC - timeB));

        if (timeB - timeA > timeC - timeB) {

            System.out.println("B方法好");

        } else {

            System.out.println("A方法好");

        }
            

String.valueOf(li[i]);