- String str1 = "hello"; String str2 = "he" + new String("llo"); System.err.println(str1 == str2);
- System.currentTimeMillis(); System.getEnv("");
- 0.6332的数据类型是() A float B double C Float D Double
- ArrayList list = new ArrayList(20);中的list扩充几次() A 0 B 1 C 2 D 3
- Java接口的修饰符可以为()[多选] A private B protected C final D abstract
- select * from user where sex = "女", select * from user where user_id = 1995(好像关于创建索引之类问题)
- group_concat() rand() from_unixtime("field_name") select * from table_n
- int(1) tinyint(1) 这两个最大值 分别是什么?
- char与varchar区别
- 表存储引擎 InnoDB:锁行?锁表?
- 哪个是锁表?
-------------------凉凉!