One to three years of Java development is a process of continuous growth and continuous learning. During this period, there is no bottleneck, no direction, because there are too many technical points to be added at this stage.
As a Java programmer, if you don't even understand some basic Java core technical points , how can you be confident in the interview and solve the problems raised by the interviewer.
And the next set of Java core technology points that I will introduce is a collection of core interview technology points developed by various major manufacturers such as Ali, Tencent, JD.com, and ByteDance for beginners and intermediate programmers.
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Java basics
- JAVA exception classification and handling
- JAVA reflection
- JAVA annotation
- JAVA inner class
- JAVA generic
- JAVA serialization (creating reusable Java objects)
- JAVA copy
JVM
- Thread
- JVM memory area
- JVM runtime memory
- Garbage collection and algorithms
- JAVA four reference types
- GC generational collection algorithm VS partition collection algorithm
- GC garbage collector
- JAVA IO / NIO
- JVM class loading mechanism
Java collection
- Interface inheritance and implementation
- List
- Set
- Map
Java multithreaded concurrency
- JAVA concurrent knowledge base
- JAVA thread implementation / creation method
- 4 thread pools
- Thread life cycle (state)
- 4 ways to terminate threads
- The difference between sleep and wait
- The difference between start and run
- JAVA background thread
- JAVA lock
- Basic thread method
- Thread context switch
- Synchronization and deadlock
- Principle of Thread Pool
- JAVA blocking queue principle
- Usage of CyclicBarrier, CountDownLatch, Semaphore
- The role of the volatile keyword (variable visibility, prohibit reordering)
- How to share data between two threads
- ThreadLocal function (thread local storage)
- The difference between synchronized and ReentrantLock
- ConcurrentHashMap concurrency
- Thread scheduling used in Java
- Process scheduling algorithm
- What is CAS (compare and exchange-optimistic locking mechanism-lock spin)
- What is AQS (Abstract Queue Synchronizer)
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Spring principle
- Spring features
- Spring core components
- Spring common modules
- Spring main package
- Spring common annotations
- Spring third-party integration
- Spring IOC principle
- Spring APO principle
- Spring MVC principle
- Spring Boot principle
- JPA principle
- Mybatis cache
Microservice
- Service registration discovery
- API gateway
- Configuration Center
- Event scheduling (kafka)
- Service tracking (starter-sleuth)
- Service Fuse (Hystrix)
- API management
Netty 与 RPC
- Netty principle
- Netty high performance
- Netty RPC implementation
- RMI implementation
- Protoclol Buffer
- Thrift
The internet
- 7-layer network architecture
- TCP/IP principle
- TCP three-way handshake/four waved hands
- HTTP principle
- The principle of CDN
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Log
- Slf4j
- Log4j
- LogBack
- ELK
Zookeeper
- Zookeeper concept
- Zookeeper role
- How Zookeeper Works (Atomic Broadcast)
- Znode has four types of directory nodes
Kafka
- Kafka concepts
- Kafka data storage design
- Producer design
- Consumer design
RabbitMQ
- concept
- RabbitMQ architecture
- Exchange type
Hbase
- concept
- Columnar storage
- Hbase core concepts
- Hbase core architecture
- Hbase writing logic
- HBase vs Cassandra
MongoDB
- concept
- Features
Cassandra
- concept
- Data model
- Cassandra consistent hash and virtual node
- Gossip protocol
- Data replication
- Data write request and coordinator
- Data read request and background repair
- Data storage (CommitLog, MemTable, SSTable)
- Secondary index (a RowKey is generated for the summary of the value to be indexed)
- Data read and write
Design Patterns
- Design Principles
- Factory method pattern
- Abstract factory pattern
- Singleton mode
- Builder mode
- Prototype mode
- Adapter mode
- Decorator mode
- Agency model
- Appearance mode
- Bridge mode
- Combination mode
- Flyweight model
- Strategy mode
- Template method pattern
- Observer mode
- Iterative subpattern
- Chain of Responsibility Model
- Command mode
- Memo mode
- State mode
- Visitor mode
- Intermediary model
- Interpreter mode
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Load balancing
- Layer 4 load balancing vs. Layer 7 load balancing
- Load balancing algorithm/strategy
- LVS
- Keepalive
- Nginx reverse proxy load balancing
- HAProxy
database
- Storage engine
- index
- Three paradigms of database
- Database is transaction
- Stored procedure (a set of SQL statements for a specific function)
- Trigger (a program that can be executed automatically)
- Database concurrency strategy
- Database lock
- Distributed lock based on Redis
- Classification table
- Two-phase commit agreement
- Three-phase commit agreement
- Flexible transaction
- CAP
Consensus algorithm
- Paxos
- Zab
- Raft
- NWR
- Gossip
- Consistency Hash
JAVA algorithm
- Binary search
- Bubble sort algorithm
- Insertion sort algorithm
- Quick sort algorithm
- Hill sorting algorithm
- Merge sort algorithm
- Bucket sorting algorithm
- Base sorting algorithm
- Pruning algorithm
- Backtracking algorithm
- Shortest path algorithm
- Maximum subarray algorithm
- Longest Common Subsequence Algorithm
- Minimum spanning tree algorithm
data structure
- Stack
- Queue
- Link
- Hash Table
- Sorted binary tree
- Red black tree
- B-TREE
- bitmap
Distributed cache
- Cache avalanche
- Cache penetration
- Cache warm-up
- Cache update
- Cache degradation
There are also Hadoop, Spark, Storm, YARN, etc., so I won’t share them here.
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The text content has been sorted out, friends who need it, scan the QR code on the left side of the homepage or click the hyperlink below the QR code to receive it for free! ! !