Let recently recommended a headhunter to help lower the ants gold dress, waited more than a week almost no news, I thought resume hung up, suddenly No. 3.29 evening at eight a phone call back, direct telephone interview. Face questions about the following
1. Under introduce yourself, say you are responsible under the service module?
2. The business how to avoid because the network jitter, front resubmit the user to refresh the page?
3. The JVM lock? Reentrant lock, lightweight lock,
4. things isolation mechanism database
5. A call more service dao how to ensure the use of a database is linked to support things? ThreadLocal
6. The the ThreadLocal data structure what
7. know what and contracting
8. The loading classes jvm
9. What CAS that? Old values, expectations, new value
10. CAS how to ensure that multiple threads value is the latest update? volatile
11. know the volatile keyword do? To ensure that each thread values are read main memory
12. how to solve the ABA problem? version number
13. The fair locks and lock unfair difference? The so-called fair lock refers to which thread to run, you can get a lock first. Unfair lock is regardless of whether the thread is to run, it is random to acquire a lock.
14. The four kinds of java references? Strong references, virtual references, weak references, soft references
15. A SpringMVC loading process
16. The parent-child relationship spring and springmvc container?
17. The springmnv injected beanspring can use it?
18. A Spring springmvc parent is something Subcategory parent class has a subclass of what parent class is not injected beanspring not use springmnv
19. The things that spring is how to achieve?
20. The dynamic proxy, static proxy, which uses the class, which is in the package, specifically how to achieve?
The above is a telephone interview
The second round of on-site interviews
Five pen questions
Under what circumstances will be 1 ConcurrentModificationException how to avoid
Ambiguous tree 2 a 20 node number up to the sixth floor
3 Bank A to B transfers A to consider things hot Account
4 loading process common to the class web projects
5. bring a large number of request parameters how these storage parameters, what database design, bottlenecks?
Face questions begin:
1. Under the first self-introduction, said that under specific projects, business?
2. The order of the class loader, which loader, classloading
3. said distributed between multiple systems If multiple system requests such as risk control, order fulfillment, payment fails this time how to deal with?
4. the synchronized and lock what's the difference? What kind of a large number of requests?
5. S pringbean life cycle?
6. the init-Method,, Destory-Method, the difference?
7. Database left index principle, the underlying principle
