beginning
When I was 25, I left JD.com and joined Baidu.
I met the architect Jiu Ge (T9 level) at Baidu. Because of his words, my career was completely changed. In just three years, I grew from an ordinary programmer to a technology in the eyes of others. Big coffee.
At that time, because of business needs, he was also taken care of by Brother Jiu. He said this to me:
He asked, "If you spend 5 years studying databases, can you become an expert in this field?"
I said, "It should be possible"
He said, "You are only 30 in 25, 5 years from now. You can become an expert in a certain field at the age of 30. Why not do it? Look at how many 30-year-olds around you who are still doing nothing. Already a database expert."
At that time, I had just entered the BAT that others dream of. I was in various impetuous periods. Although I was studying every day and seemed to work very hard, but the effect was extremely limited. I wanted to learn big data today, and cloud computing tomorrow. Researching machine learning, my mood is fickle, and I don’t know what my future will be like.
Java basics
- Java Object class methods
- HashMap principle, Hash conflict, concurrent collection, thread-safe collection and implementation principle
- The difference between HashMap and HashTable
- HashCode function, how to overload the hashCode method
- Difference and connection between ArrayList and LinkList
- GC mechanism
- Java reflection mechanism, Java proxy mode
- Java generics
- Synchronized principle
- Volatile implementation principle
- The meaning and difference of method lock, object lock and class lock
- Methods of thread synchronization: Synchronized, lock, reentrantLock analysis
- Types of Java locks: fair locks, optimistic locks, mutex locks, segmented locks, biased locks, spin locks, etc.
- Principle and usage of ThreadLocal
- Usage and examples of ThreadPool
- The difference between wait() and sleep()
Java Advanced
- Java virtual machine, Java operation, Java GC mechanism (reachability analysis method, reference counting method)
- The complete life cycle of Java objects
- JVM memory model
- Inter-process communication, inter-thread communication
- JVM class loading mechanism
- Java reference types
- Design patterns: In addition to common design patterns, special, reflection mechanisms, and proxy patterns
- HTTP protocol and HTTPS protocol
- Socket protocol, Socket realizes long connection
- TCP and UDP protocol
- The concrete realization of GET and POST in HTTP protocol
- Serialization and deserialization
- The realization principle of thread pool
- Basic knowledge of database: multi-table query, index, database transaction
Data structure and algorithm
data structure
- Stack and queue
- Array and linked list, customize a dynamic array
- Hash table, and the resolution of Hash conflicts
- Binary tree
- B+ B-tree
- Basic sorting algorithm: focus on fast sorting, merge sorting, heap sorting (big root heap, small root heap)
- Optimization of fast queue
- Binary search and variant binary search
- Huffman tree, red-black tree
- String operation, string search, KMP algorithm
- Graph BFS, DFS, prim, Dijkstra algorithm (high-level skills)
- Classic problem: the processing of massive data (the problem of finding the largest 10,000 number TOP K among 1 billion numbers)
algorithm
- Divide and conquer algorithm
- Dynamic programming
- how are you
- Branch and bound
Android basics
- Application life cycle
- Android Activity life cycle
- Android Service, IntentService, Service and communication between components
- Activity's onNewIntent
- Fragment lazy loading implementation, parameter transfer and storage
- Detailed ContentProvider instance
- BroadcastReceiver use summary
- Android message mechanism
- Binder mechanism, shared memory implementation principle
- Android event distribution mechanism
- Implementation of Android multithreading: Thread, HandlerThread, AsyncTask, IntentService, RxJava
- How ActivityThread works
- Implementation principle of nested sliding
- RecyclerView and ListView (caching principle, difference connection, advantages and disadvantages)
- View drawing principle, custom View, custom ViewGroup
- View、SurfaceView 与 TextureView
- Why the main thread Looper.loop does not cause an infinite loop
- ViewPager cache implementation
- The difference and connection of requestLayout, invalidate, postInvalidate
- New features of AndroidP
- Android two virtual machines
- ADB commonly used commands
- The difference between the Asset directory and the res directory
- Getting started with Android SQLite
to sum up
In fact, it is very simple to master easily, and there are two main points:
- Find a good set of video materials and follow the knowledge framework that Daniel has sorted out to learn.
- Practice more. (Video advantage is strong sense of interaction and easy to concentrate)
You don't need to be a genius, and you don't need to have a strong talent. As long as you do these two points, the probability of success in the short term is very high.
For many junior and intermediate Android engineers, if they want to improve their skills, they often grow up on their own, and the learning effect of fragmented systems is inefficient, long and helpless. The screenshots of the following information are compiled by me over a few months, and I am full of sincerity: especially suitable for Android programmers with 3-5 years of development experience to learn.
- Download the direct link to receive by yourself: [ Click me to get it! 】
- The above advanced BATJ learning materials can be shared with everyone for free. Friends who need the full version, [ click here to see all the content ].
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