System.out.printf("初次连接数据库:%f\n", (t3 - t2) / NANO_TIME_PER_SEC); System.out.printf("再次连接数据库:%f\n", (t11 - t10) / NANO_TIME_PER_SEC); System.out.printf("初始化数据库和表:%f\n", (t4 - t3) / NANO_TIME_PER_SEC); System.out.printf("插入:%f\n", (t5 -...