From the two areas to share the interview summary 5 faces US group Gang of Java, has successfully won the offer

 

US Mission Java interview Zhenti

1. java virtual machine memory model
2. Memory overflow generally occurs in which area? Permanent generation will not cause a memory leak?
3. Framework of dynamic loading of classes to know what?
4. What are the general dynamic proxy implementations? Dynamic proxy scenarios What?
5. Stack will not overflow? What general stack overflow throw an exception? jvm where to set the size of the stack? What are the parameters set?
6. What used jvm command to view the status of stack information?
7. jvm garbage collection mechanism?
8. java class loading mechanism? How to implement a custom class loader? FindClass difference with the loadClass?
9. String, StringBuffer, StringBuilder difference? Corresponding usage scenarios?
10. How to achieve immutable class?
11. Shallow copy and deep copy? How to achieve deep copy?
12. HashMap, HashTable, ConcurrentHashMap difference?
13. CAS is what kind of synchronization mechanism?
14. NIO principles, which include several components?
15. A brief reflection of java? Reflex areas in which there are scenarios?
16. spring loaded bean process?
17. java thread pool? Several parameters meaning thread pool constructor? keepAliveTime explain?
18. An interface going to call another five interface Each interface will return data to the calling interface, call interface to merge the data and return to the upper layer. Such a scenario may be used under the contract and which classes? How would you go to achieve such business scenarios?
19. CountDownLatch and CyclicBarrier difference?
20. What thread locking way? The difference between synchronized and lock in?
21. The role of the volatile keyword? Why AtomicLong instead of using Long? AtomicLong bottom is how to achieve?
22. mysql storage engine, which has several?
23. springmvc request processing workflow?
24. spring of affairs how to use? Transaction rollback? Custom exception?
25. Dirty read? Magic Reading?
26. tcp four waved process? Why TIME_WAIT MSL at least twice the time?
27. get and post requests difference?
28. cookie and session requests?
29. What open source middleware understand? Cache? Message? Distributed framework?
30. Which to use design patterns? Achieve Singleton pattern?
31. Transaction database implementation principle of operation, how to do things between independence and other issues
32. Dirty reads the database, phantom reads, non-repeatable reads principle reason arise, solutions
33. Isolation level of the database, MVCC
34. Optimistic locking, pessimistic locking, mutexes, read-write locks realization of the principle of distinction
35. Thread of the life cycle
36. Consistency of principle and application hash algorithm
37. CAP principles
38. CAS operation
39. Distributed raft algorithm

 

 

 

 

 

Interview Experience

In general it can be divided into two blocks: the basics of site architecture and large-scale technology used.

• Basics
• Examination of the basics that every business interview an essential link. Foundation is a job must be familiar with and master the knowledge, basic grammar, including programming languages, data structures, JVM, algorithms, operating systems, computer networks, databases and so on.
• Back-end technology system  where a rear end of said technical system can be understood as derived from the basic mass based on a series of high user concurrent processing and distributed processing technology. Technology including load balancing, message queue, availability, data integrity, or the like distributed transaction-based middleware such technology.

Overall, the  foundation is able to determine whether a solid through the first round of interviews, mainly on the basic skills of the interviewer whether solid. As long as through the first round of interviews, to say the least has been a major success. The technical back-end technology system determines the interviewer or the second three interview interview rating success.

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