Yesterday I went to a company to interview for a Java development position. This article is mainly to make a record and summary of the interview.
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1. Three characteristics of object-oriented
Answer: encapsulation, inheritance, polymorphism.
2. XML parsing
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3. Reflection
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7, Hibernate's first-level cache, second-level cache
8. Can the key of ConcurrentHashMap be null?
9. Thread naming of the thread pool
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10. MySQL installed on Linux can only be accessed locally, but other machines cannot access it
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11. The number of core threads in the thread pool (core) and the maximum number of threads (max)
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12. Thread pool capture exception
13. Mapper of Mybatis
refer to:
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14. Jsp and servlet, 9 built-in objects of jsp
Nine built-in objects of JSP:
Built-in object name type| request | HttpServletRequest |
| response | HttpServletResponse |
| config | ServletConfig |
| application | ServletContext |
| session | HttpSession |
| exception | Throwable |
| page | Object(this) |
| out | JspWriter |
| pageContext | PageContext |
Four domain objects of JSP:
object domain| ServletContext | context field |
| HttpServletRequet | request field |
| HttpSession | session field |
| PageContext | page field |
15. File upload, socket, stream
refer to:
16、Netty
refer to:
Netty - Introduction to Basic Use
17. Collection
答：List、Set、Map
Lists are ordered and can have repeating elements
Set is unordered and does not allow duplicate elements
Map is a key-value pair
18, IO Wa NIO
refer to:
Java NIO series of tutorials
19. Write at the end
Finally, I found that the interviewer also made some mistakes... Please see the original text, the original address is at the bottom of the article
Write it here first, and update it later if there is anything to add.
This article is permanently updated at the address: https://github.com/nnngu/LearningNotes/blob/master/_posts/2018-03-30-%E6%9F%90%E5%85%AC%E5%8F%B8(%E7 %AE%80%E7%A7%B0SMKJ)%E9%9D%A2%E8%AF%95%E8%AE%B0%E5%BD%95.md