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Java fundamentals:

Hashmap structure; what object can be used as key

Hashtable,concurrentHashMap,hashtable comparison

String,StringBuilder,StringBuffer

Deep and shallow copy of object

Multithreading:

Whose method is wait,sleep respectively, the difference

Whether the await method of countLatch is safe and how to modify it.

Thread pool parameters, description of the whole process

The underlying principle behind aqs,cas

ThreadLocal principle, matters needing attention, parameter transfer

There are also java locks, built-in locks, display locks, various containers.

And lock optimization: lock elimination, lock coarsening, lock bias, lightweight lock

For web:

Whether servlet is thread-safe and how to modify it

The difference between session and cookie, the difference between get and post, tcp3 handshake, post or get for file upload

Storage of session

How to prevent form from being submitted repeatedly

Jvm:

Jvm memory model

Jvm question tool, jps,jinfo,jmap...

Database:

The most important thing and the underlying implementation

The scene of simple failure

Leftmost principle

View the execution plan

And carndiation

Then there is the type of lock, row-level table-level.

Pessimistic and optimistic lock

Explain the things and characteristics of the database

Isolation level

And implementation, redo log .undo log

Bin log master-slave replication

Mvcc,Next-Key Lock

Distributed:

Asked CAP, and base.

Which features of CAP are satisfied by zookeeper, paxos

How to solve the problem of cache penetration

Redis's io model

If you ensure the high availability of redis

Is redis single or multithreaded?

How to troubleshoot the excessive proportion of online cpu

Consistent hash

Sub-database sub-table

Spring:

Ioc,aop principle

Ioc initialization process

The process of springmvc

Springboot,spring cloud related components

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