1. String str1 = "hello"; String str2 = "he" + new String("llo"); System.err.println(str1 == str2);
  2. System.currentTimeMillis(); System.getEnv("");
  3. 0.6332的数据类型是() A float B double C Float D Double
  4. ArrayList list = new ArrayList(20);中的list扩充几次() A 0 B 1 C 2 D 3
  5. Java接口的修饰符可以为()[多选] A private B protected C final D abstract
  6. 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)
  7. group_concat() rand() from_unixtime("field_name") select * from table_n
  8. int(1) tinyint(1) 这两个最大值 分别是什么?
  9. char与varchar区别
  10. 表存储引擎 InnoDB:锁行?锁表?
  11. 哪个是锁表?

-------------------凉凉!